INDEX 



(Asterisks indicate pages on which occur illustrations of the subject 



mentioned) 



Aard Vark, 375 *, 377, 378 



Acanthiuridse, 146 



Acanthodei, 110 



Acanthodidae, 110 



Acanthopterygii, 98, 110, 111, 146-150 



Accessory respiratory organs of fishes, 

 108, 109 



Acipenser, 133; eggs of, 164; A. ruthenus 

 132* 



Acris gryllus, 201 



Acrobates, 357 



Adaptations, laws of, 16-20; aquatic, 

 16, 17 *; climbing (scansorial), 18 *; 

 cursorial, 18; fossorial, 18 



Adaptive changes incident to ter- 

 restrial life, 175, 176 



Adaptive radiation, 19; of reptiles, 

 211 *; of snakes, 258, 259; of mar- 

 supials, 353 



Adelochorda (see Cephalochordata) 



Adobenus obesus, 369 * 



Muropus, 368 



^Bpyornithes, 287 



Aglossa, 196-198 



Agnathostomata, 69 



Agouti, 372 



Air-bladder, of Teleostomi, 128; of 

 Polypterus, 131 



Albatross, 293 *, 294, 295 



Alcedo, foot of, 280 * 



Alecteromorphae, 289 



Alimentary system, of Amphioxus, 38; 

 of tunicate, 51; of Balanoglossus, 62; 

 in Squalus, 114; of fishes, 101; of 

 turtle, 230, 231; of bird, 267 



Allantoida, 68, 69 



Allantois, 68, 69; in reptiles, 212, 213 *; 

 in birds, 320, 321 *; in placenta! 

 mammals, 409, 410*, 411*; in 

 Man, 411 * 



Allen, B. W., 195 



Alligator Gar, 133, 134 



Alligator mississippiensis, 245 * 



Allotheria, 338 



Alopecias vulpes, 122 * 



Alosa, eggs of, 164 



Altrices, 323 



Alytes obstetricans, 197 *, 198 



Ambergris, 402 



Amblypoda, 340, 342-344 



Amblyrhynchus cristatus, 250 *, 252 



Amblystoma tigrinum, 189, 190 *, 192 



Amia, 109, 133, 167; A. calva, 133 



Amiidse, 133 v 



Ammocoetes larva, 38 f\ 5 



Amnion, 68, 69; in reptiles, 212, 213 *; 



in birds, 319, 320 *, 321; in placenta! 



mammals, 409 *, 410 *, 411 * 

 Amniota, 68, 69, 95 *, 96 

 Amphibamus, 180 * 

 Amphibia, 13, 33, 68, 69; present and 



past status, 173, 174, origin of, 175, 



176; characters of, 183, 184; 

 Amphibian ancestry of mammals, 



theory of, 333 

 Amphignathodon, 199 

 Amphioxus, 31, 32, 33, 34 *, 35, 36 *, 



37*, 38, 39*, 40*, 41*, 42, 43*, 



44 *, 45 *, 46 *, 47 *, 48, 71, 72, 75 

 Amphioxus theory of vertebrate origin, 



72-75 



Amphiuma means, 186, 187 * 

 Amphiumidse, 186, 187 

 Anabas scandens, 108 *, 109, 150 * 

 Anableps, 166 

 Anacanthini, 111, 145, 146 

 Anallanloida, 68, 69 

 Anamnia (Anamniota), 68, 69 

 Anapsida, 215 

 Anastomus, beak of, 282 * 

 Ancistrodon piscivorus, 257 

 Angel-shark, 122 *, 123 



417 



