6oo 



INDEX 



L. 



^abial palp, see Palp 



Labrum, 356 



Lachrymal ducts and glands, see 

 Naso-lachrymal ducts and glands 



Lacunse, see Bone 



LamellLE of gills (Mussel), 388 



Lamellibranchiata, 396 



Lamina terminalis, 514 



Lancelet : general characters, 

 404 ; fins, 405 ; skeleton, 405 ; 

 gill-slits and bars, 407 ; enteric 

 canal, 40S ; blood-vessels, 40S ; 

 nephridia, 408 ; nervous system, 

 408 ; gonads, 409 ; development, 

 4°9i 557 ; practical directions, 

 410-413 



Larva, 9, 340, 370, 395, 396, 409 



Laryngo-tracheal chamber, 141 



Larynx, 489, 500 



Lateral line, 416, 448 



Legs, see Appendages 



Lens of eye, 183, 517, 569 



Lepus, see Rabbit 



Leucocyte, 105, 328 



Life, origin of, 281 ; and see Bio- 

 genesis 



Life-history, 8, 206 ; and see undcr 

 various types 



Ligaments, 55, 57 



Limbs, see Appendages 



Lips, 468 



Liver, 20, 133, 204, 359, 408, 431, 



499 

 Lobster, 346 

 Lumbricida;, 341 

 LUMBRICUS, see Earthworm 

 Lungs, 10, 22, 141, 204, 208, 501 

 Lymnseus, 5<?5- 

 Lymph, 18 

 Lymph-hearts, 97, gS 

 Lymphatic glands, see Adenoids 

 Lymphatic system, 18, 97, 442 



M. 



.M 



. alleus, see Auditory ossicles 

 Malpighian capsule, 146, 574 

 Mammalia, 219, 403, 466 



Mammary glands, see Glands 



Mandible, i6, 44, 352, 422, 479 



Mantle, 381 



Mantle-cavity, 385 



Manubrium : of Medusa, 307 ; of 



malleus, 519; of sternum, 483 

 Manus, 5, 50, 46S, 485 

 Marrow-cavity, 48 

 Matrix, see Intercellular substance 

 Maturation of ovum, 552 

 Maxilla : Crayfish, 352 

 Maxilliped, 350 

 Meckel's cartilage, 44, 422 

 ' Mediastinum, 501 

 Medulla oblongata, 157, 443, 513 

 Medullary : cord, folds, groove, and 



plate, 202, 559 ; sheath, 167 ; 



substance of Infusoria, 264, 269, 



273 



Medusa, 304, 307-312 



Megagamete, 279 



Meganucleus, 265, 273 



Megazooid, 251, 279 



Membranous labyrinth, 186, 449, 

 518 



Mesencephalon, see Mid-brain 



Mesenteron, see Archenteron 



Mesentery, 22, 431, 498 



Mesoderm, 202, 203, 210, 340, 369, 

 454, 559. 565 ; vertebral and 

 lateral plates of, 565 



Mesodermal segments, 565 



Mesogloea, 293, 307 



Mesonephros, 573, 574 



Metabolism, 149, 236 



Metacarpus, 50, 485 



Metamere, Metameric segmenta- 

 tion. 3I9> 346, 354 



Metamorphosis, 11, 209, 280 



Metanephros, 573, 576 



Metapleural fold, 406 



Metatarsus, 51, 488 



Metazoa, 286 



Microgamete, 279 



Micrometer, 121 



Micromillimetre {p.) = y-jl^j of a 

 millimetre, or TrTrJim of an inch 



Micronucleus, 265, 275 



Micropyle, 400, 547, 554 



Microtome, 138 



