INDEX 



Names of genera are printed in italics. The figures in thick 

 type refer to illustrations. In all cases the references are to pages. 



Aard-vark, 669 



Abdomen, 176, 179, 180, 232, 233, 237, 



243, 259 



Abdominal artery, 202 

 Abdominal ganglion, 293 

 Abdominal pores, 448 

 Abdominal ribs, 584 

 Abducens nerve, 425 

 Abomasurn, 694 

 Aboral pole, 80 

 Aboral sinus, 337 

 Acanthia, 257, 281 

 Acanthobdella, 162, 166 

 Acanthobdellidae, 166 

 Acarids, 268 

 Acarina, 268, 282 

 Acetabulum, 533, 576 

 Aciculum, 158 

 Acineta, 47 



Acipenser, 473, 501, 517 

 Acipenseridae, 501 

 Acoela, 98, 111 

 Acopa, 411 

 Acridium, 280 

 Acris, 559, 562 

 Acromion, 594 

 Aetinometra, 361 

 Actinophrys, 29, 30 

 Actinosphaerium, 29, 30. 31, 52 

 Actinozoa, 68, 78, 80, 82 

 Adambulacral ossicles, 333 

 Adder, 591 



Adductor muscles, 300, 301 

 Adhesive cells, 78 

 Adrenal body, 557 

 Aegithognathous palate, 629 

 Aeschna, 194, 195, 252 

 Aetheospondyli, 473, 496, 516 

 Afferent, 89 

 Aglossa. 558, 561 

 Air-bladder, 453, 489, 491, 498, 503, 



504, 513, 514, 516 



Air-sacs, 623 



Alary muscles, 240 



Alauda, 635 



Albatross, 632, 634 



Albumen gland, 295 



Alcedo, 635 



Alces, 698, 724 



Alcyonaria, 73, 82 



Alcyonium, 68, 69, 70, 71, 72 



Alimentary canal, 142 ; of Arthropods, 

 188; of Birds, 624; of Craniata, 427; 

 of Echinoderms, 330, 350, 352; of 

 Hirudo, 163 ; of Lamellibrancbs, 

 305; of Nemertines, 113; of sea- 

 urchin, 352; of Sepia, 317; of Verte- 

 brates, 385, 395, 400, 446, 461, 508 



Alisphenoid, 476, 610, 647 



Allantoic bladder, 524 



Allantoic placenta, 664, 670 



Allantois, 450, 563, 659, 064 



Alligator, 568, 598, 602, 605 



Alligator-turtles, 597 



Alloiocoela, 98, 99, 112 



Allolobophora, 157, 105 



Alpaca, 696 



Alpine race, 714 



" Alternation of generations," in Coe- 

 lenterata, 65 ; in Tunicata, 412 



Alveoli, 349, 599 



Alytes, 548, 558 



Amblystoma, 543, 549, 561 



Amblystomatinae, 543 



Ambulacral grooves, 327, 340 



Ambulacral muscles, 341 



Ambulacral ossicles, 333 



Ambulacral plates, 341, 346, 354 



Amerind, 714 



Amia, 473, 498, 499, 503, 516 



Amino-acid, 5 



Amiurus, 492, 514 



