INDEX 



Lentigen cells, 138 

 Lepidurus productuS) 100, 106 

 Leptodora hyalina, 134 

 Leydig's organs, 124, 136 

 Ligamentum denticulatum, 187 

 Ligula, 152 

 Limbs, of crayfish, 119 



of mammals, 293 

 Limntea stagnalis, 70, 77 



truncatula, 10, 15 

 Limpet, 84 



Lingua, 158 



Lips, 286 



Liver, 264 



Liver-fluke, 2 



Lobi inferiores, 235 



Lobster, 113 



Lower jaw of mammals, 291 



Lubbock, Sir J., 106 



Lumbricus herculeus, 17-44 



Lungs, 266 



Lymph spaces, 183 



Macromeres, 36, 83 

 Malleus, 291 

 Malpighian body, 276 



tubules, 159 

 Mammalia, 284 

 Mammary glands, 285 

 Mandibles of Apus, 99, 107 



of crayfish, 117, 123, 142 



of cockroach, 152 

 Mandibular arch, 266 

 Mantle, 55, 72 

 Mantle cavity, 55, 72 

 Marsupials, 299, 300 

 Maxillae of Apus, 99, 108 



of crayfish, 117, 123 



of cockroach, 152 

 Maxillipeds, 117, 119, 120 

 Maxillo-turbinal bone, 290 

 Meckel's cartilage, 214, 270, 292 

 Medulla oblongata, 236 

 Membranous labyrinth, 245, 279 

 Mentum, 152 



Meropodite, 120 

 Mesenchyme, 262 

 Mesentery, 181 

 Mesethmoid, 290 



Mesoblast, i, 36, 48, 141, 145, 165, 

 247, 256, 260, 266, 301 



Mesoblastic somites, 39, 43, 48, 



146, 194, 198, 262 

 Mesocardium, 272 

 Mesogaster, 220 

 Mesomere, 36, 48, 51, 83 

 Mesometrium, 234 

 Mesonephros, 230, 232, 275 

 Mesonephric tubules, 276 

 Mesonotum, 154 

 Mesopterygium, 216 

 Mesorchium, 232 

 Mesothorax, 154 

 Mesovarium, 233 

 Metabola, 170 

 Metamere, 21 



Metameric segmentation, 50, 52 

 Metanauplius, 107 

 Metanephros, 231, 298 

 Metanotum, 154 

 Metapleur, 175, 176 

 Metapterygium, 216 

 Metatheria^ 299, 300 

 Metathorax, 154 

 Micromere, 36, 83 

 Mid-brain, 235 

 Mid-gut, 126 

 Milk dentition, 287 

 Miracidium, 9, 10, 15 

 Molar teeth, 287 

 Mollusca, 53 

 Monoecious, 33, 80 

 Monogenetic parasite, 8 

 Mouth of Amphioxus, 177 

 Miillerian duct, 232, 233, 277, 298 

 Muscle segments, 209 

 Mushroom-shaped gland, 163 

 Mustelus Icevis, 203 

 Myocoele, 199 



Myotomes, 173, 180, 209, 218, 267 

 Mytilus edulis, 61 



Nacreous layer of shell, 54 



Naso-oral groove, 204 



Nauplius, 107, 142 



Nauplius eye, 94 



Neck gland, 94 



Neck organ, 107 



Nephridium, 9, 24, 40, 42, 49, 51, 



74, 90, 1 60, 187, 1 88 

 Nephridiopore, 20 

 Nephroblast, 40 



