272 



INDEX 



Seals, " eared," evolution of 



under-fur in, 52 

 Sea-snake, young, care of, 156 

 Sea-squirts, strange history of, 



265 

 Shark, basking, eggs of, 208, 210 

 Skinks, remarkable colour 



changes in young, 173 

 Skuas, devastations of, 83 



— pugnacity of nestlings of, 84 

 Skull, evolutionary evidence of 



in nestling birds, 138 

 Smelt, remarkable egg of, 211 

 Snake, remarkable colour-change 



in young, 172, 173 

 Snake-fish, development of, 228 

 Specialisation, perils of, 92 

 "Specialised" animals, mean- 

 ing of, 55 

 Spider, flight of young, 262 

 Spiders, care of young, 265 

 Spiny ant-eater, eggs of, 7 



pouch of, 1 1 



suckling of, 7 



Squirrel, flying, carrying young, 



19 

 Stalk-eye, curious larval fish, 



225 

 Stickleback, nursing habits of, 



215 

 Striped coloration of mammals, 



28, 30 

 Surf-perches, embryos of, 220 

 Sivine, coloration of young of, 29 

 Sword-fish, transformations of, 



226 



Tadpole, curious nurseries of, 

 198 et seq. 



— funnel-mouthed, 189 



— glass-like, 193 



Tadpoles, extraordinary, 189, 

 190 



— spawn of, 181 



Tail, evolution of in birds, 3, 136 



— evolution of in fish, 229 



— of archasopteryx, 3 



— of modern bird, 3 



Tapir, coloration of young in, 29 

 Teeth, of embryo whales, 3, 43 



Teeth, " milk," 41 



— of young platypus, 44 



— remarkable changes in, 42 

 Teleoptyles, meaning of, 151 

 Temperature, effect on nestlings, 



92 

 Tenrecs, spines of young, 51 

 Terrapin, painted, coloration 



of young, 168 

 Thylacine, transverse stripes of, 



31 

 Tinamou, vestiges of teeth in 



nestling, 143, 145 

 Titmouse, evolution of, 109 

 Toad, midwife, method of carry- 

 ing eggs, 19s 



— Surinam, method of carry- 

 ing eggs, 197 



Tortoise, care of young in, 159 



— evolution of shell in, 176 



— -degeneration of shell in, 179 

 Trionyx, eye-spots in, 168 

 Tuatera, embryos of, 161 

 Turner, Miss E. L., on young 



water - rails, 58 ; on young 



shrikes, 76 

 Turtle, arrau, prolificness of, 162 



Warblers, sanitation of nest in, 74 



— play of nestlings among, 94 

 Waterhen, coloration of nest- 

 ling in, 100 



Weaver-finch, nestling ornament 

 in, in 



Whales, teeth of young, 3 



Whelk, young, preying on fel- 

 lows, 264 



Wing, development of in birds, 



134. 137 



— of nestling aquatic birds, 1 2 5 



— of nestling archaeopteryx, 121, 



136 



— of nestling game-birds, 122 



— of nestling hoatzin, 118 

 Woodcock, carrying young, 63 



Young devoured by parents, 264 

 — ■ devouring one another, 264 



— driven off by parents, 72 



Zebra, stripes of, 31 



Printed by Maxell, Watson & Viney, Ld., London and Aylesbury, England. 



