680 



INDEX. 



Labor, division of, 165 

 Labridse, 576 

 Labrum, 463 

 Labyrinth, 128, 542 

 Labyrinthodonta. 586 

 Lac, 490 

 Lacerta, 599 

 Lacertilia, 598 

 Lacertilidse. 599 

 Lace wings, 482 

 Lachrymal bone, 590 

 Lachrymal gland, 542 

 Lacinia, 473 

 Lacteal dentition, 625 

 Lacuna, 379 



Lacunar blood system, 1 13 

 Ladder nervous system, 124 

 Lady bird, 485 

 Lady crab, 436 

 Laemodipoda, 439 

 Lagena, 543 

 Lagomys 639 

 Lama, 643 

 Lamarck, 14, 22 

 Lamarckism, 53 

 Lamblia, 202 

 Lamellae, Haversian, 87 

 Lamellae bone, 87 

 Lamellibranchiata, 358 

 Lamellicornia, 484 

 Lamellirostres, 615 

 Lamna, 571 

 Lamnae, 618 

 Lamprey eels, 555, 557 

 Lampyridee, 484 

 Land crab, 437 

 Lanistes, 372 

 Lantern of Aristotle, 345 

 Larus, 615 

 Larva, 160 

 Larval organs, 161 

 Laryngeal cartilages, 524 

 Lateralia, 424 

 Lateral line, 537. 564 

 Lateral teeth, 359 

 Latrodectes, 451 

 Laurer's canal, 273 

 Leaf butterflies, 47 



Leaf hoppers, 489 

 Leatherback tortoise, 595 

 Leather turtle, 596 

 Leda, 367 

 Leeches, 318 

 Leeuwenhoek, 13 

 Lemniscus, 304 

 Lemuridae, 649 

 Lemurs, 648, 649 

 Lens of eye, 130, 131, 541 

 Lepadidae, 425 

 Lepas, 172, 425 

 Lepidonotus, 313 

 Lepidoptera, 494 

 Lepidosauria, 594, 597 

 Lepidosiren, 579 

 Lepidosteidae, 574 

 Lepidosteus, 574 

 Lepidurus, 416 

 Lepisma, 477 

 Lepralia, 324 

 Leptalis, 48 

 Leptasterias, 337 

 Leptocardii, 502 

 Leptocephalus, 575 

 Leptochela, 441, 442 

 Leptoclinum, 510 

 Leptodiscus, 204 

 Leptodora, 417 

 Leptomedusae, 239, 242 

 Leptoplana, no, 271 

 Leptostraca, 427 

 Lepus, 639 

 Lernaea, 422 

 Lernaeidae, 422 

 Lernaeocera, 421, 422 

 Lernaeopodidae, 422 

 Leucania, 495 

 Leucetta, 225 

 Leuckart, 18 

 Leucocytes, 88 

 Leucon, 223 

 Leucones, 226 

 Leucortis, 226 

 Leucosoidea, 437 

 Leucosolenia, 225 

 Libel lula, 479 

 Libellulidae, 479 



