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The Echidna, or Australian Hedgehog, although quite as remarkable in internal structure as the Ornithorhynchus, is not so peculiar in external appearance, having very much the aspect of a hedgehog or spiny armadillo. The two species of this genus are very closely allied; one inhabits East and South Australia, the other Tasmania. - . * * * t

Extinct Echidnidae.—Remains of a very large fossil species of Echidna have lately (1868) been discovered at Darling Downs in Australia.

Remark on the Distribution of the Monotremata.

This order is the lowest and most anomalous of the mammalia, and nothing resembling it has been found among the very numerous extinct animals discovered in any other part of the world than Australia.

CHAPTER XVIII. THE DISTRIBUTION OF THE FAMILIES AND GENERA OF BIRDS. Order I-PASSERES.

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The extensive and familiar group of Thrushes ranges over every region and sub-region, except New Zealand. It abounds most in the North Temperate regions, and has its least development in the Australian region. Thrushes are among the most perfectly organized of birds, and it is to this cause, perhaps, as well as to their omnivorous diet, that they have been enabled to establish themselves on a number of remote islands. Peculiar species of true thrush are found in Norfolk Island, and in the small Lord Howes’ Island nearer Australia; the Island of St. Thomas in the Gulf of Guinea has a peculiar species; while the Mid-Atlantic island Tristan d’Acunha,_one of the most remote and isolated spots on the globe-has a peculiarly modified form of thrush. Several of the smaller West Indian Islands have also peculiar species or genera of thrushes.

The family is of somewhat uncertain extent, blending insensibly with the warblers (Sylviidae) as well as with the Indian bulbuls (Pycnonotidae), while one genus, usually placed in it (Myiophonus) seems to agree better with Enicurus among the Cinclidae. The genera here admitted into the thrush family are the following, the numbers prefixed to Some of the genera indicating their position in Gray's Hand List of the Genera and Species of Birds :

(*) Brachypterya (8 sp.), Nepaul to Java and Ceylon (this may belong to the Timaliidae); Turdus (100 sp.) has the range of the whole family, abounding in the Palaearctic, Oriental and Neotropical regions, while it is less plentiful in the Nearctic and Ethiopian, and very scarce in the Australian; (*) Oreocinela (11 sp.), Palaearctic and Oriental regions, Australia and Tasmania; (*) Rhodinocichla (1 sp.), Venezuela; (*) Melanoptila (1 sp.), Honduras; (**) Catharus (10 sp.) Mexico to Equador; (* *) Margarops (4 sp.), Hayti and Porto Rico to St. Lucia : (*) Nesocichla (1 sp.), Tristan d’Acunha; (*) Geocichla (8 sp.), India to Formosa and Celebes, Timor and North Australia; (**) Monticola (8 sp.), Central Europe to South Africa and to China, Philippine Islands, Gilolo and Java; (*) Orocoetes (3 sp.), Himalayas and N. China; Zoothera (3 sp.) Himalayas, Aracan, Java, and Lombok ; Mimus (20 sp.) Canada to Patagonia, West Indies and Galapagos; (*) Oreoscopies (1 sp.), Rocky Mountains and Mexico; (*) Melanotis (2 sp.), South Mexico and Guatemala; (*) GaleoScoptes (1 sp.), Canada and Eastern United States to Cuba and Panama; (**) Mimocichla (5 sp.), Greater Antilles; (**) Harporhynchus (7 sp.), North America, from the great lakes to Mexico; Cinelocerthia (3 sp.), Lesser Antilles; (7") Rhamphocinclus (1 sp.), Lesser Antilles; Chatops (3 sp.), South Africa; Cossypha = Bessonornis (15 sp.) Ethiopian region and Palestine.

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This immense family, comprising all the birds usually known as “Warblers,” is, as here constituted, of almost universal distribution. Yet it is so numerous and preponderant over the whole Eastern Hemisphere, that it may be well termed an Old-World group; only two undoubted genera with very few species belonging to the Nearctic region, while two or three others whose position is somewhat doubtful, are found in California and the Neotropical region. Canon Tristram, who has paid great attention to this difficult group, has kindly communicated to me a MSS. arrangement of the genera and species, which, with a very few additions and alterations, I implicitly follow. He divides the Sylviidae into seven sub-families, as follows: 1. Drymoecinae (15 genera 194 sp.), confined to the Old World and Australia, and especially abundant in the three Tropical regions. 2. Calamoherpinae (11 genera, 75 sp.), has the same general distribution as the last, but is scarce in the Australian and abundant in the Palaearctic region; 3. Phylloscopinae (11 genera, 139 sp.), has the same distribution as the entire family, but is most abundant in the Oriental and Palaearctic regions. 4. Sylviinae (6 genera, 33 sp.), most abundant in the Palaearctic region, very scarce in the Australian and Oriental regions, absent from America. 5. Ruticillinae (10 genera, 50 sp.); entirely absent from America and Australia; abounds in the Oriental and Palaearctic regions. 6. Saxicolinae (12 genera, 126 sp.), absent from America (except the extreme north-west), abundant in the Oriental region and moderately so in the Palaearctic, Ethiopian, and Australian, 7. Accentorinae (6 genera, 21 sp.), absent from the Ethiopian region and South America, most abundant in Australia, one small genus (Sialia), in North America. The distribution of the several genera arranged under these sub-families, is as follows: 1. DRYMCEGINA.—(*) Orthotomus (13 sp.), all the Oriental region; (787) Prinia (11 sp.), all the Oriental region; (7° 74° 7” *) Drymoea (83 sp.), Ethiopian and Oriental regions, most abundant in the former; (48 °7* * * * *) Cisticola (32 sp.), Ethiopian and Oriental regions, with South Europe, China and Australia; (*) Suya (5 sp.), Nepal to South China and Formosa; ("*) Sphenaeaeus (7 sp.), Australia, New Zealand, and Chatham Island, with one species (?) in South Africa; (" ") Megalurus (4 sp.), Central India to Java and Timor; ("*") Poodytes (2 sp.), Australia; (*) Amytis (3 sp.), Australia; (*) Sphenura (4 sp.), Australia; (*) Malurus (16 sp.), Australia and Tasmania; (7° 7%) Chthonicola (3 sp.), Australia; (*) Calamanthus (2 sp.), Australia and Tasmania; (*) Camaroptera (5 sp.), Africa and Fernando Po; (*) Apalis (1 sp.), South Africa. 2. CALAMOHERPINAE.—(77 °781 * * *) Acrocephalus (35 sp.), Palaearctic, Ethiopian, continental part of Oriental region, Moluccas, Caroline Islands, and Australia; (**) Dumeticola (4 sp.), Nepal to East Thibet, Central Asia, high regions; (**) Potamodus (3 sp.), Central and South Europe, and East Thibet; (8) “” ”) Lusciniola (1 sp.), South Europe; (" ") Locustella (8 sp.), Palaearctic region to Central India and China; (*) Horites (5 sp.), Nepal to North-west China and Formosa; (* –78%) Bradyptetus = Cettia (10 sp.), South Europe, Palestine, and South Africa; (* *) Catriscus (3 sp.), Tropical and South Africa; Bernieria (2 sp.), and (*) Ellisia (3 sp.), Madagascar; (**) Mystacornis (1 sp.), Madagascar; (*) Calamodus (2 sp.), Europe and Palestine; (*) Tatare (2 sp.) Samoa to Marquesas Islands. 3. PHYLLOSCOPINE"—Phylloscopus (18 sp.), all Palaearctic and Oriental regions to Batchian; (* * *) Eremomela (16 sp.), Tropical and South Africa; (*) Eroessa (1 sp.), Madagascar; Hypolais (12 sp.), Palaearctic region, all India, Timor, North and South Africa; (***) Abrornis (26 sp.), Oriental region; (*) Reguloides (4 sp.), Palaearctic and continental Oriental regions; (*) Sericornis (7 sp.), Australia and Tasmania (***) Acanthiza (14 sp.), Australia and New Caledonia; (*) Regulus (7 sp.), all Palaearctic and Nearctic regions and south to Guatemala; (*) Polioptila (13 sp.), Paraguay to New Mexico; (*) Gerygone (22 sp.), Australia, Papuan and Timor groups, New Zealand and Norfolk Island. -

* The species of the genera Phylloscopus and Hypolais are so mixed up in the Hand List, that Mr. Tristram has furnished me with the following

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