INDEX. 



v. = vide ; n. after numbers = note. 



Generic names only are in italics. 



In the accounts of the classes, the different points are treated as nearly as possible in the same 

 order : external form ; integument and exoskeleton ; endoskeleton if present, and musculature ; 

 nervous system and organs of special sense ; digestive, circulatory, respiratory, renal and sexual 

 organs ; development and larval forms if any ; distribution in time and space ; classification ; 

 literature. 



A. 



Abdominal pores of Pisces, 

 426, 427 ; of Cyclostomi, 

 436; QiAmphioxus, 439. 



Abdominal ribs, 384. 



Acalephae, v. Acraspeda. 



Acantharia, 883. 



Acanthin, 874. 



Acanthocephala, 689-691. 



AcanthodriluS) nephridia, 

 205. 



Acanthopteri, 431. 



Acarina, 529. 



Acaroidea, 496. 



Accessory rays, 95, 97. 



Acephalocyst, 665. 



Acerata, 496. 



Acetabulum of Aves, 6l. 



Achromatin, xxii. 



Aciculum of Chaetopoda, 594. 



Acinetaria, 824-830. 



Acipenser, sub vertebral liga- 

 ment, 334. 



Aclitelliani, 207. 



Acone eyes of Insecta, 502. 



Acontium, 241, 737. 



Acrania = Cephalochorda. 



Acraspeda, 780-790. 



Acrocyst, 246, 768. 



Acrodont, 387. 



Acromion, v. Shoulder-girdle. 



Actiniaria, 734 ; asexual re- 

 production, 741. 



Actinobolus, 829, 832. 



Actinotrocha, 704. 



Actinula, 765. 



Actipylea, v. Acantharia. 



Adambulacral ossicles of As- 

 teroidea, 564. 



Adenoid tissue, 354. 



Aeluroidea, 368. 

 Aeolosoma, prostomium, 198. 

 Aepyornts, 380. 

 Aethalium, 910, 911. 

 Affinities, Rodentia, 38-45. 

 Air-bladder, 87, 350, 423 ; 



connection with ear in 



Pisces, 420. 



Air-sacs, Aves, 55, 57, 379. 

 Alary muscles, 144, 494. 

 Albuminogenous layer, Ces- 



tode embryo, 227. 

 Albuminiparous gland, 114, 



117. 



Alcyonaria, 726-733. 

 Alcyonidae, 732. 

 Alecithal ovum, xxv. 

 Allantoid bladder, 75, 77, 



405- 



Allantoidea, 359. 

 Allantois, 358. 

 Alternation of generations, 



xxxi ; in Cestoda, 231-233 ; 



Spongilla, 250; 446, 650, 



656, 747, 754- 

 Ambulacral grooves of Crin- 



oidea, 573. 

 Ambulacral ossicles of Aster- 



oidea, 564 ; plates in Echi- 



noidea, 558 ; shields in 



Ophiuroidea, 567. 

 Ambulacral surface, etc., 190. 

 Ametabola, 507. 

 Amiadae, 431. 

 Amitosis, xxii. 

 AmmocoeleS) v. Cyclostomi. 

 Ammonoidea, 464. 

 Amnion, 358. 

 Amnion of Insecta, 507. 

 Amniota, 359. 

 Amoeba, 256-258. 

 Amoebidium.) 864. 



Amoebina, 897-907. 



Amoebosporidia, 862. 



Amoebula, 821, 908. 



Amphibia, 394-409; paedo- 

 genesis in, 408 ; persistent 

 blastopore, 335 ; v. Rana. 



Amphiblastula, 800. 



Amphicoelous vertebra, 340. 



Amphidiscs, 250. 



Amphilinidae, 665. 



Amphineura= Isopleura. 



Amphioxus, 437. 



Amphipoda, 540. 



Amphistylic, 96. 



Amphitrochae, 606. 



Amphtuma, 408. 



Ampullae, Euspongia, 252 ; 

 Elasmobranchii, 274, 410 ; 

 Porifera, 794, 803 n. 



Anacanthini, 431. 



Anal fin, v. Fins unpaired. 



Anal gland of Anisopleura, 

 478. 



Anal respiration of Crustacea, 

 536. 



Anamniota, v. Ichthyopsida. 



Anapophysis, v. Vertebra. 



AnaptychuS) 456 n. 



Anchznta, 446, 447. 



Aneitea, tentacles, 120. 



Angiostomum, 75, 583, 680. 



Angular, v. Lower jaw. 



Anisopleura, 472. 



Annuli of Microchaeta, 198 ; 

 of HirudO) 212, 214. 



Annulus tympanicus, 80. 



Anodonta, shell, 124-127 ; 

 dissection of, 128-138 ; 

 foot, 129; gills, 130; di- 

 gestive system, 132-133; 

 nephridium, 134 ; nervous 

 system, 135-138 ; history 



