INDEX 



(The references to Illustrations are printed in thick type.) 



Aard-vark, 845. 



wolf, 872 



Abdominal pores, 560, 602. 



— ribs, 686. 



Abducens nerve, 545, 598 

 Abomasum, 850, 851. 

 Absorption, 32. 

 Abyssal fauna, 896. 

 Acanella, 201. 



Acanthias, 609, 610, 611, 634. 

 • — arterial system of, 614. 



— brain of, 612. 

 Acanthobdella, 279, 280. 

 Acantbobdellidae, 280. 

 Acanthocephala, 236, 243. 

 Acanthochiton, 471. 

 Acanthodei, 635. 

 Acarapis, 424. 

 Acarina, 422. 

 Acephala, 479. 

 Acerentulus, 408. 

 Acerontomon, 408, 408. 

 Acetabulum, 795. 

 Aciculum, 266. 

 Acineta, 135. 

 Acinetaria, 135. 

 Acipenser, 638, 639. 

 Acoela, 214. 



Acontia, 193. 

 Acorn-shell, 346, 346. 

 Acquired characters, 89, 90. 

 Acraspeda, 205. 



— and Craspedota, 190. 

 Acrodont teeth, 698. 

 Acromion, 793. 

 Acrossota, 199. 

 Actinia, 193, 195. 

 Actiniaria, 205. 

 Actiniidea, 196. 

 Actinomma, 135. 

 Actinophrys, 112, 113, 131. 

 Actinopoda, 310. 

 Actinopterygii, 637. 

 Actinosphaerium, 114, 131. 

 Actinotrocha (larva), 285, 286. 

 Actinozoa, 195, 205. 

 Activities of animals, 20, 21. 



gradients of, 42. 



Adambulacrals, 292. 



Adamsia, 209. 



Adaptive radiation, 722. 



Adder, 707, 709. 



Adhesive cells, 205. 



Adineta, 282. 



Adrenal body of rabbit, 809. 



Adrenalin, 560. 



Aedes, 409. 



^ginopsis, 205. 



^luroidea, 870, 871. 



^lurus, 873. 



Colostoma, 266. 



i^pyomis, 761, 772. 



Aerial fauna, 901. 



^thalium, 131. 



Agamidae, 702. 



Aglossa, 677. 



Agouti, 867. 



Air-bladder of Fishes, 556, 632. 



— -sacs of Birds, 726, 752, 753, 756. 

 of Lizards, 701. 



Albumen gland of snail, 443. 



— of bird's egg, 755, 764. 

 Alces, 852. 

 Alcyonaria, 195, 199, 205. 



— and Zoantharia, 195. 



— diagrams of types of, 198. 

 Alcyonarian, diagrammatic section of, 194. 



— spicules, 200. 

 Alcyonidium, 287. 

 Alcyonium, 195, 200. 

 Alecithal ova, 76. 

 Algae, symbiotic, 214. 



Alimentary system of Amphioxus, 520. 



of Anodonta, 450. 



of Arenicola,. 259. 



-of Ascidian, 502. 



^ of Aurelia, 185. 



of Balanoglossus, 490. 



of bee, 380, 381. 



— • — of Birds, 730. 



of Chelonia, 688. 



of cockroach, 374. 



of crayfish, 328. 



-of Crinoidea, 312. 



— • — of Crustacea, 356. 



of Distomum, 216. 



of dogfish, 613. 



of earthworm, 250. 



937 



