INDEX AND GLOSSARY. 



245 



ing gills '.rranged. in sheets, like 



the clam and oyster, 22. 

 Larva, the caterpillar or worm state 



of an insect. 

 Larynx, 65. 

 Lasso-cells, 110. 

 Layers of the embryo, 142. 

 Leaping, 91. 

 Lemming, 190, 197. 

 Leptaena alternata, 224. 

 Lestris, 72. 

 Life, 35, 44. 

 Limbs, 54. 



Limnea, parasites of, 160, 162 

 Lingula prima, 224. 

 Lithodendron pseudostylina, 231. 

 Liver, 129. 



Lobophyllia flabellum, 231. 

 Lobsters, mode of swimming, 94 ; 



nervous system, 46. 

 Locomotion, 79; organs of, 82; 



modes of, 88. 

 Loligo, arms of, 180. 

 Lungs, 118. 

 Lymphatic vessels, 100. 



Magas, 232. 



Malacostraca, 21. 



Mammals, animals which nurse 

 their young, 19 ; number of, 27 ; 

 reign of, 222, 233. 



Man, reign of, 222, 234 ; races of, 

 212 ; his twofold nature, 25. 



Manatee, 206. 



Manducata, insects furnished with 

 jaws, 21. 



Marchantia polymorpha, reproduc- 

 tion of, 166. 



Marl, earth principally composed 

 of decayed shells and corals, 216. 



Marsupials, animals with a pouch 

 for carrying their young, as the 

 opossum ; gestation of, 183. 



Marsupkes, 233. 



Mastication, 101. 



Mastodon, 236. 



Matrix, the organ in which the em- 

 bryo is developed, 152. 



Medulla oblongata, continuation of 

 the brain into the back-bone. 



Medusa, jelly-like animals living in 

 the sea, 23 ; development of, 163 ; 

 digestive organs, 98 motion 80. 



Megalobatrachus, 209. 



Megalosaurus, 229. 



Melocrhius amphbra, 224. 



Mem>ry, 68. 



21* 



Menobranchus, 202, 209. 



Menop6ma, 202, 209. 



Merganser, an aquatic bird allied to 

 the goose, 66, 193. 



Metacarpus, the wrist, 83. 



Metatarsus, 87. 



Metamorphic rocks, 216, 174. 



Metamorphosis, 149, 167; of the 

 silk-worm, 175 ; canker-worm, 

 176: duck-barnacle, 177; star-fish, 

 178; comatula, 179. 



Micraster cor-anguinum, 232. 



Miocene formation, 219. 



Modern age, 222, 235. 



Molar teeth, 106. 



Molecules, very minute particles, 35. 



Mollusks, soft animals of the snail 

 and oyster kind; heart of, 117; 

 liver of, 129 ; number of, 27 ; meta- 

 morphosis of, 179. 



Monkey, teeth of, 107, 205. 



Mon6culus, mode of carrying eggs, 

 135 ; motion, 73 : apparatus of, 73. 



Moulting, the shedding of feathers, 

 hair, &c., 128. 



Muscles, 73; disposition of, in in- 

 sects, 77 ; in, fishes, 78 ; in birds, 

 79. 



Muscular tissue, 39. 



Myxine glutinosa, its eye, 55. 



Natatores, birds with webbed feet 

 for swimming, 20. 



Natica, tongue of, 102 ; heart of, 117. 



Nautili, 22. 



Neptunian rocks, 215. 



Nereis, jaws of, 102 ; gills of, 81 ; 

 eye, 53. 



Nervous system, 44 ; in mammals, 

 45 ; in articulates, 46 ; in crusta- 

 ceans, 46 ; in radiates, 47. 



Nervous tissue, 39. 



Nest of Baltimore oriole, 70 ; of tai- 

 lor bird, 70 ; of Ploceus, 71. 



Nomenclature, the naming of ob- 

 jects and their classes, family, &c. 



Nostrils, 60. 



Notosaurus, 228. 



Nucleolites, 232. 



Nucleolus, a little nucleus, 38. 



Nucleus, a kernel, or condensed 

 central portion, 38. 



Nudibranchiates, mollusks having 

 the gills floating externally, fig. 91 



Nummulites, 234. 



Nurses, of Cercaria, 162; of ants 

 and bees, 163. 



