INDEX 



Aard-vark, 535. 



Abactinal end, of starfish, 158. 



Acanthias vulgaris, 366. 



Acanthin, 31. 



Acetabulum, 342 ; of frog, 416. 



Aciculum of Annelids, 190. 



Acineta, 51. 



Acmaea testudinalis, 292. 



Acrania, 323. 



Acromion process, 500. 



Actinobolus, 49. 



Actinomma asteracanthion, 32. 



Actinophrys sol, 26. 28. 



Actinosphaerium, 27, 28. 



Actinostome, 158. 



Actinozoa, 91, 114. 



Adamsia palliata, 123. 



Adelochorda, 311. 



Adrenals, of birds, 476; of frog, 427 



Agalmopsis cara, 108. 



Air-bladder, 403. 



Air-sacs, of birds, 472, 477; of in- 

 sects, 248. 



Air-vesicles, 513. 



Albatross, 490. 



Alcyonaria, 118, 119. 



Alcvonium carneum,ii9; palmatum 

 119. 



Alisphenoid, 498. 



Allantois, 434. 



Alligator, 434, 438, 456; brain, 449. 



Alveolus, 504. 



Amaroucium, 320. 



Ambulacral groove, 160, 161. 



Ambulacra] pores, 161. 



Ambulacrum, 160. 



Amnion, 434. 



Amoeba, 14, 19; polypodia, 18; pro- 



teus, 14. 

 Amphicaelous vertebrae, 334. 



Amphineura, 281. 



Amphibia, 407. 



Amphidiscs, 88. 



Amphioxus lanceolatus, 323. 



Amphistomum, 136. 



Ampulla, 162. 



Anemone, sea, 115, 117. 



Anguis, 436. 



Animalcules, wheel, 178. 



Annelida, 188, 191. 



Annulata, 188. 



Annuli of leeches, 203. 



Anodonta cygnea, 265, 270, 273, 274; 



fluviatilis, 265; circulatory system, 



of, 276. 

 Anolis, 328. 

 Anomalurus, 541. 

 Anoplophyra, 49. 

 Ant-eater, 526, 531 ; scaly, 533; spiny, 



5 2 5. 5 2 7- 



Antedon, 175. 



Antelope, 526, 537 



Antenna, 219. 



Antennule, 219. 



Antlers, 537. 



Anthenea, 167. 



Anthophysa, 37. 



Anthrenus scrophularice, 245. 



Antipathes, 120. 



Ant, red, 253; neuter, 253; soldier, 

 253 ; worker, 253. 



Anura, 432. 



Anus, 46; of Antedon, 175; of star- 

 fish, 159; absent in starfish, 170; of 



545 



