INDEX. 



Acalephse — Tentacles, 101 ; Ectoderm, 

 103; Urticating capsules, 163; Skele- 

 ton, 106 ; Nervous system, 108 ; 

 Gastric filaments, 118 ; Sexual or- 

 gans, 119. 



Acanthias — Pin, 477 ; Kidneys, 603. 



Acanthocephali — Integument, 136; Mus- 

 cular system, 143 ; Muscular iibres, 

 144 ; Nervous system, 147 ; Enteron, 

 159 ; Lemnisci, 174 ; Generative 

 organs, 176. 



Acanthometridse — Skeleton, 82. 



Acanthopteri — Urostyle, 431. 



Acarina — Metameres, 237 ; Cerebral 

 ganglia, 256 ; Cteca, 269 ; Hind-gut, 

 270 ; Malpighian vessels, 276 ; Germ- 

 glands, 298. 



Acera — Ganglia, 348. 



Acervulince — Supporting organs, 81. 



Acheta— Testis, 304. 



Achetida — Auditory organ, 262. 



Acineta — Figure, 88. 



Acipenser — Dermal bones, 425 ; Ribs, 439; 

 Cartilaginous cranium, 450 ; Dermal 

 denticles, 450 ; Thoracic fin, 479 ; 

 Spiracular cleft, 543 ; Pseudobran- 

 chia, 543 ; Air-bladder, 547. 



Acopa— Form of body, 390 ; Gemmation 

 in, 391; Ganglia, 397 ; Branchial sac, 

 399; Branchial slits, 402; Sexual 

 organs, 407. 



Acrania — Auditory organs, 533 ; Eespi- 

 ratory cavity, 541. 



Acridida — Auditory organ, 262. 



Acrodont Lizards — Teeth, 557. 



Acrocladia — Spines, 206. 



Actaeon — Excretory organ, 377. 



Actinosphferium — Figure, 84. 



Adder — Epigastric veins, 595. 



.(EginidiB— Tentacles, 102, 107; Mar- 

 ginal vesicle, 110 ; Gastrovascular 

 system, 115 ; Generative organs, 122. 



-ffiginopsis — Tentacles, 102. 



-iSIolidia— Ganglia, 349 ; Liver, 362 ; Ves- 

 sels, 372 ; Hermaphrodite glands, 

 382. 



j3i]quoridse — Generative organs, 122. 



.aischna— Tracheal gills, 290. 



Alciopidae — Visual organs, 155; Auditory 

 organs, 156 ; Excretory organs, 176. 



Alcyonaria — Generative organs, 122. 



Alcyonella — Nervous system, 146. 



Alcyonidse — Digestive persons, 117. 



Alcyonium — Skeleton, 106 ; Figure of, 

 116. 



Alepas — Mantle, 236. 



Alligator — Pelvis, 485 ; Spinal nerves, 

 514. 



Alveolina — Shells, 81. 



Amia — Sphenoids, 452. 



Ammocoetes — Vertebral column, 426 ; 

 Notochord, 426. 



Ammonites — Shell, 333. 



Ammothoe — Digestive organs, 269. 



Amniota — Muscles of paired appendages, 

 498 ; Glossopharyngeal, 518 ; Vagus, 

 521 ; Nasal canal, 526. 



Amoeba — Figure of, 78; Supporting or- 

 gans, 81 ; Contractile vesicle, 86. 



AmoebidEe — Protoplasm of, 76. 



Amphibia — Anterior appendages, 414 ; 

 Limbs, 415 ; Corium, 417 ; Epidermis, 

 418 ; Tegumentary glands, 420 ; Der- 

 mal bones, 425 ; Vertebral column, 

 429; Vertebraj, 432; Atlas, 437; 

 Sternum, 442 ; Dermal denticles, 

 450; Skull, 450; Jugal, 457; Bran- 

 chial skeleton, 469; Branchial arches, 

 470; Hyoid, 471; Shoiilder-girdle, 

 475; Fore-limb, 480; Radius, 480; 

 Ulna, 480; Carpalia, 480; Pelvic- 

 girdle, 484; Hind-limb, 488; Toes, 

 490; Dermal muscles, 493; Trunk 

 muscles, 494 ; Intercostal muscles, 

 496; Muscles of the branchial skele. 

 ton, 497 ; Masticatory muscles, 497 ; 



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