INDEX. 



635 



Ichneumonida — Mid-gut, 272 ; Cement- 

 glands, 303. 



Ichthyornis — Teeth, 551. 



Infusoria — Sensory organs, 42 ; Alimen- 

 tary canal, 47 ; Protoplasm, 77 ; 

 Nucleus, 77; Cuticular layer, 78; 

 Figure of, 79; Skeleton, 83; Con- 

 tractile vacuoles, 85 j Conjugation, 

 89. 



Iusecta — Alimentary canal, 48 ; Head, 

 235 ; Metamercs, 237 ; Thorax, 237 ; 

 Gnathites, 241; Mouth orgaus, 215; 

 Feet, 245 ; Mandibles, 245 ; Maxilla3, 

 2 15 ; Feet, 246 ; Dorsal appendages, 

 247 ; Wings, 247 ; Integument, 248 ; 

 Spines, 250; Spinning vessels, 250; 

 Nervous system, 257 ; Ganglia, 258 ; 

 Visceral nerves, 259 ; Nervus recur- 

 reus, 259; Nervi transversi accessorii, 

 260; Tactile rods, 260; Olfactory 

 organs, 261 ; Auditory organs, 261; 

 Simple eye, 265 ; Compound eyes, 

 266; Faceted eye, 267; Enteric 

 caual, 270 ; Malpighian vessels, 271, 

 273, 276; Hind-gut, 273; Salivary 

 glands, 274; Subneural cavity, 279; 

 Blood-cells, 280; Ate cordis, 283; 

 Circulatory organs, 283 ; Aorta, 283 ; 

 Ecdysis, 289 ; Germ-glands, 292 ; 

 Generative organs, 300, 304 ; Par- 

 thenogesis, 302 ; Pseudova, 302 ; 

 Seminal elements, 305 ; Copulatory 

 organ, 305. 



Iusoctivora — Centrale, 482 ; Symphysis 

 pubis, 486; Fibula, 490; Cerebral 

 hemispheres, 509 ; Vena? cavae, 592 ; 

 Testes, 618; Vesiculse seminales, 618 ; 

 Prostatic vesicles, 619. 



Isopoda — Branchia3, 241 ; Ventral chord, 

 255 ; Compound eyes, 267 ; Chyle 

 intestine, 268 ; Liver, 275 ; Heart, 

 280 ; Female organs, 294 j Seminal 

 elements, 305. 



Ixodes — Generative organs, 298. 



Janthina — Branchiae, 338. 



Julus — Salivary glands, 274 ; Malpighian 



vessels, 276 ; Renal concretions, 278 ; 



Circulating system, 284 ; Generative 



organs, 299. 



Labyrinthobranchiata — Branchial arches, 

 470. 



Lamrargus — Ovaries, 610. 



Lacerta — Columella, 458 ; Frontals, 458. 



Lagomys — Caecum, 562. 



Lagostomus — Uterus, 616. 



Lamellibranchiata — Velum, 318; Diagram 

 of, 319 ; Foot, 321 ; Tentacles, 326 ; 

 Integumentary glands, 329 ; Byssus 

 gland, 329; Shell, 331; Hinge of 

 shell, 332 ; Branchiae, 336 ; Muscles, 

 342 ; Nervous system, 345 ; Visceral 

 nerves, 351 ; Tentacles, 352 ; Visual 



organs, 353 ; Auditory vesicles, 357; 

 Alimentary canal, 358 ; Stomach, 359 ; 

 Hind-gut, 359; Liver, 364; Ccelom, 

 367 ; Circulatory centres, 368 ; Auri- 

 cles, 369, 373 ; Vessels, 372 ; Form- 

 elements of blood, 375; Organs of 

 Bojanus, 376 ; Generative organs, 

 380. 



Lamellicornia? — Ventral chord, 258; Tra- 

 cheal vesicles, 289. 



Lemur — Dorso-lumbar vertebrae, 436. 



Lepadidaj — Dermal skeleton, 249; Ven- 

 tral chord, 255 ; " Cement glands," 

 285 ; Hermaphroditism in, 291. 



Lepidoptera — Thorax, 237; Mouth organs, 

 246; Feet, 246; Wings, 248; Spinning 

 vessels, 250; Nervus recurrens, 259; 

 Malpighian vessels, 277 ; Tracheal 

 vesicles, 2S9 ; Ovary, 302 ; Cement- 

 glands, 303 ; Bursa copulatrix, 303. 



Lepidosiren — Vagus, 517 ; Air-bladder, 

 568; Heart, 580; Aortic arches, 580; 

 Allautois, 620. 



Lepidosteus — Opercular gill, 543 ; Spiral 

 valve, 560. 



Lepisma — Ventral chord, 258. 



Lepus— Uterus, 617 ; Urogenital canal, 

 619. 



Leptocardii — Notochord, 426 ; Olfactory 

 organs, 525 ; Vertebrae, 438. 



Leucifer — Auditory vesicles, 261. 



Libellulidae — Tracheal gills, 273; Salivary 

 glands, 274 ; Respiration in, 290. 



Limax — Tentacles, 326; Byssus gland, 

 329 ; Shell, 332 ; Lung, 339. 



Limicola? — Excretory organs, 177 ; Gene- 

 rative organs, 185. 



Limnadia — Shell, 235 ; Respiration in, 

 269 ; Liver, 274 ; Ovary, 294. 



Limnadiaceae — Branchia;, 241. 



Limnctis — Branchiae, 241. 



Lineus — Proboscis, 141. 



Liuguatulidae — Tracheae, 291. 



Lingula— Gill, 308; Stalk, 308; Alimen- 

 tary canal, 311 ; Cooca, 311 ; Vascular 

 system, 312. 



Lisarmatidae — "Lungs," 215; Excretory 

 organ, 312. 



Littorina — Denticles, 360 j Stomach, 362; 

 Penis, 386. 



Lizard — Foot, 489 ; Arteries, 587. 



Lizzia — Tentacles, 101. 



Locustidae — Auditory organs, 262. 



Lcemodipoda — Compound eyes, 267. 



Loliginidae — Fins, 325 ; Arms, 326 j 

 Calamus, 335 ; Respiratory organs, 

 340 ; Eye, 355 ; Pharynx, 361, 362 ; 

 Digestive organs, 363 ; Liver, 366 ; 

 Ink-bag, 367 ; Circulatory centres, 

 368; Arteries, 374; Oviduct, 386; 

 Pouches of Needham, 387. 



Loligopsis — Eye, 355 ; Caeca, 363. 



Lophobranchii — Carapace, 424 ; Ribs 

 438 ; Vertebras, 439. 



