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Europe, Asia, and North America ; Argentina (4 sp.), Mediterranean and deep seas of Western Europe ; Microstoma (2 sp.), Mediterranean, and seas of Greenland; Salarix (2 sp.), China and Japan, in seas and rivers. Salmo, Osmerus, Coregonus, and Thymallus, are British genera.

Family 66.–PERCOPSIDÆ. (1 Genus, 1 Species.).

“A fresh-water fish covered with toothed scales.”

DISTRIBUTION.–Lake Superior, North America.

FAMILY 67.—GALAXIDÆ. (1 Genus, 12 Species.)

“Fresh-water fishes, with neither scales nor barbels.”

DISTRIBUTION.—The temperate zone of the Southern Hemisphere.

The only genus, Galaxias, is found in New Zealand, Tasmania, and Tierra del Fuego, ranging north as far as Queensland and Chili; and one of the species is absolutely identical in the two regions.

FAMILY 68.—MORMYRIDÆ. (3 Genera, 25 Species.)

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Fresh-water fishes, with scales on the body and tail but not on the head, and no barbels.”

DISTRIBUTION.—The Ethiopian Region.

Most abundant in the Nile, a few from the Gambia, the Congo, and Rovuma. The genera are :

Mormyrus (1 sp.), Nile, Gambia, West Africa, Mozambique, Rovuma ; Hyperopsius (2 sp.), Nile and West Africa; Mormyrops (4 sp.), Nile, West Africa and Mozambique.

FAMILY 69.-GYMNARCHIDÆ. (1 Genus, 1 Species.)

“Fresh-water fishes, reseinbling the Mormyridæ, but with tapering finless tail, and neither anal nor ventral fins."

DISTRIBUTION.— Ethiopian region.

The only genus, Gymnarchus, inhabits the Nile and the rivers of West Africa.

Family 70.-ESOCIDÆ. (1 Genus, 7 Species.)

" Fresh-water fishes, with scaly bodies, no barbels, and dorsal fins situated towards the tail.”

DISTRIBUTION.— The Nearctic and Palæarctic regions.

One species, the Pike (Esox lucius) ranges from Lapland to Turkey, and in America from the Arctic regions to the Albany river; the remainder are American species extending South as far as New Orleans.

FAMILY 71.—UMBRIDÆ. (1 Genus, 2 Species.) ‘Small fresh-water scaly fishes, without barbels or adipose fin.” DISTRIBUTION.— Central Europe and Temperate North America.

FAMILY 72.-SCOMBRESOCIDÆ. (5 Genera, 136 Species.)

“ Marine or fresh-water fishes, with scaly bodies and a series of keeled scales along each side of the belly.”

DISTRIBUTION.—Temperate and tropical regions.

All the genera have a wide distribution. A species of Belone and one of Scombresox are found on the British coast. The Flying fishes (Exocetus, 44 sp.), belong to this family. They abound in all tropical seas and extend as far as the Mediterranean and Australia. None of the genera are exclusively fresh-water,

but a few species of Belone and Hemiramphus are found in rivers in various parts of the world.

FAMILY 73.-CYPRINODONTIDÆ. (20 Genera, 106 Species.)

“Fresh-water fishes, covered with scales, the sexes frequently differing, mostly viviparous."

DISTRIBUTION.—Southern Europe, Asia, Africa and North America, but most abundant in Tropical America.

The distribution of the genera is as follows :

Cyprinodon (11 sp.), Italy, North Africa and Western Asia to Persia, also North America from Texas to New York; Fitzroya (1 sp.), Montevideo; Characodon (1 sp.), Central America ; Tellia (1 sp.), Alpine pools of the Atlas: Limnurgus (1 sp.), Mexican plateau; Lucania (1 sp.), Texas ; Haplochilus (18 sp.), India, Java, Japan, Tropical Africa, Madagascar, and the Seychelle Islands, Carolina to Brazil, Jamaica ; Fundulus (17 sp.), North and Central America and Ecuador, Spain and East Africa ; Rivulus (3 sp.), Tropical America, Cuba and Trinidad ; Orestias (6 sp.), Lake Titacaca,' Andes ; Jenynsia (1 sp.), Rio Plata; Pseu'doxiphophorus (2 sp.), Central America ; Belonesox (1 sp.), Central America; Gambusia (8 sp.), Antilles, Central America and Texas; Anableps (3 sp.), Central and Equatorial America ; Pæcilia (16 sp.), Antilles, Central and South America ; Mollienesia (4 sp.), Louisiana to Mexico; Platypæcilus (1 sp.), Mexico; Girardinus (10 sp.), Antilles and South Carolina to Uruguay; Lepistes (1 sp.), Barbadoes.

Family 74.—HETEROPYGII. (2 Genera, 2 Species.) “ Fresh-water fishes, with posterior dorsal fin, and very small scales.”

DISTRIBUTION.-Fresh waters of the United States.

Amblyopsis (1 sp.) is a blind fish found in the caverns of Kentucky; while Chologastes (1 sp.), which only differs from it in having perfect eyes, is found in ditches in South Carolina.

FAMILY 75.-CYPRINIDÆ. (109 Genera, 790 Species.) “ Fresh-water fishes, generally scaly, with no adipose fin, and pharyngeal teeth only, the mouth being toothless."

DISTRIBUTION.-Fresh waters of the Old World and North America, but absent from Australia and South America.

This enormous family is divided by Dr. Günther into fourteen groups, the distribution of which is as follows:

Catostomina (4 genera), North America and North-east Asia ; Cyprinina (39 genera), same range as the family ; Rohteichthyina (1 genus), Malay Archipelago ; Leptobarbina (1 genus), Malay Archipelago ; Rasborina (5 genera), East Africa to China and Borneo ; Semiplotina (2 genera), Western Asia; Xenocypridina (3 genera), Eastern Asia ; Leuciscina (10 genera), Palæarctic and Nearctic regions; Rhodeina (3 genera), Palæarctic region ; Danionina (9 genera), India to China and Japan ; Hypophthalmichthyina (1 genus), China; Abramidina (16 genera), same range as the family; Homalopterina (2 genera), India to Java ; Cobitidina (10 genera), Palearctic and Oriental regions.

The following is the distribution of the genera

Catostomus (16 sp.), Nearctic region and Eastern Siberia; Moccostoma (2 sp.), Eastern United States; Sclerognathus (5 sp.), Temperate North America to Guatemala, also Northern China; Carpiodes (1 sp.), United States ; Cyprinus (2 sp.), Temperate parts of Palæarctic region (1 sp. British); Carassius (3 sp.), Temperate Palæarctic region (1 sp. British); Catla (1 sp.), Continental India; Cirrhina (5 sp.), Continental India to China; Dangila (6 sp.), Java, Sumatra, Borneo; Osteochilus (14 sp.), Siam to Java and Sumatra; Labeo (27 sp.), Tropical Africa and Oriental region; Tylognathus (10 sp.), Syria, India to Java ; Abrostomus (2 sp.), South Africa ; Discognathus (4 sp.), Syria to India and Java, mostly in mountain streams; Crossochilus (9 sp.), India to Sumatra and Java; Gymnostomus (7 sp.), Continental India; Epalzeorhynchus (1 sp.), Sumatra and Borneo ; Capoeta (13 sp.), Western Asia; Barbus (163 sp.), Temperate or Tropical

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parts of Europe, Asia, and Africa (1 sp. British); Thynnichthys (2 sp.), Pegu, Borneo, and Sumatra ; Barbichthys (1 sp.), Java, Sumatra, and Borneo; Amblyrhynchichthys (1 sp.), Sumatra and

Borneo ; Albulichthys (1 sp.), Sumatra and Borneo; Oreinus (3 . sp.), Himalayan region; Schizothorax (13 sp.), Himalayan region

and west to Afghanistan and Persia ; Ptychobarbus (1 sp.), Thibet; Gymnocypris (1 sp.), loc. unknown; Schizopygopsis (1 sp.), Thibet ; Diptychus (1 sp.), Himalayas and Thibet; Aulopyge (1 sp.), Western Asia ; Gobio (2 sp.), Temperate Europe (1 sp. British); Pseudogobio (4 sp.), China, Japan, and Formosa ; Ceratichthys (9 sp.), Temperate North America ; Bungia (1 sp.), Western Asia, Herat ; Pimephales (2 sp.), Eastern United States; Hyborhynchus (3 sp.), Eastern United States; Ericymba (1 sp.), United States; Pseudorasbora (1 sp.), Japan, China ; Cochlognathus (1 sp.), Texas; Exoglossum (2 sp.), United States ; Rhinichthys (6 sp.), Easteru United States; Rohteichthys (1 sp.), Borneo and Sumatra ; Leptobarbina (1 sp.), Sumatra and Borneo ; Rasbora (12 sp.), East Coast of Africa, India, to Java and Borneo; Luciosma (3 sp.), Java, Sumatra, and Borneo; Nuria (2 sp.), India, Tenasserim, and Ceylon; Aphyocypris (1 sp.), North China; Amblypharyngodon (3 sp.), India to Tenasserim; Cyprinion (3 sp.), Syria and Persia ; Semiplotus (1 sp.), Assam; Xenocypris (1 sp.), China; Paracanthobrama (1 sp.), China; Mystacoleucus (1 sp.), Sumatra; Leuciscus (84 sp.), Nearctic and Palæarctic regions (5 sp. are British); Ctenopharyngodon (1 sp.), China; Mylopharodon (1 sp.), California ; Paraphoxinus (2 sp.), South-eastern Europe; Meda (1 sp.), River Gila; Tinca (1 sp.), Europe (Britain to Constantinople); Leucosomus (8 sp.), Nearctic region; Chondrostoma (7 sp), Europe and Western Asia; Orthodon (1 sp.), California ; Acrochilus (1 sp.), Columbia River ; Achilognathus (6 sp.), China, Japan, and Formosa ; Rhodeus (3 sp.), Central Europe and China; Pseudoperilampus (1 sp.), Japan; Danio (8 sp.), India and Ceylon; Pterosarion (2 sp.), Central India and Assam ; Aspidoparia (3 sp.), Continental India; Barilius (15 sp.), East Africa and Continental India ; Bola (1 sp.), Ganges to Bramahputra ; Schacra (1 sp.), Bengal; Opsariichthys (5 sp.), Japan and Formosa; Squaliobarbus (1 sp.), China ; Ochetobius (1 sp.), North China ;

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