The Natural History of Animals: The Animal Life of the World in Its Various Aspects and Relations, 6. köide

adult Animalcule animals Annelids appearance arrangements attached become beetle bird bivalves blastula body brood brood-pouch budding burrow byssus Cambridge Natural caterpillars cavity cells ciliated cocoon colony colour Colugo constructed creatures Crustaceans deposited described dwelling ectoderm egg-cell eggs embryo enlarged feathers female fishes fission flight flying food-yolk forms free-swimming freshwater Gastrula gills habits hatch hole Hydra Hydroid illustration individual insects jelly-fishes kind known Lancelet large number larva larvæ later lay their eggs layer life-history living male Mammals marine means membrane Metazoa milk-glands molluscs mother mouth muscles native Natural History nest organs oviparous Ovipositor ovum pair parent possess pouch present protective Protozoa pupa purpose remarkable Reptiles resemble round Saw-Fly shape shell sheltered side skin sort spawning species Spiders Sponge stage statoblasts structure surface swimming tadpoles tail takes place threads tree Trochosphere usually Vegetative Propagation viviparous wings worm yolk young Zoophytes