INDEX — GLOSSARY 



413 



bites, 291, 293 ; reproduction of, 301 ; 

 size of, 299 ; ventral nerve cord of, 

 300, 301. 



Aquatic mammals, 374. 



Aqueous humor of eye, 334. 



Arachnida, 275, 309-316; respiration, 

 etc., see arachnids. 



Arachnids, 309-3 16 ; air-breathing, 309 ; 

 evolution of, 274, 310; evolution of 

 respiratory organs of, 310; famous 

 localities for fossil, 318; geologic 

 range of, 409 ; relationship of, 309- 

 311; respiration of, 309; water- 

 breathing, 309. 



Aragonite in animals, 25 ; distinguished 

 from calcite, 26. 



Araneida, 316. 



Araucariae, 71 ; distribution of, present 

 and past, 71. 



Arbacia, 166. 



Arboreal mammals, 374. 



Arbor vitas, 74. 



Area pexata, 220; A. transversa, 14. 



Archaic characters, persistence of, with 

 modern ones, 386. 



Archelon ischyros, j66. 



Archeopteryx, 7, 370, 371. 



Archi-annelida, 142. 



Archipterygium, 345 ; of crossopterygii, 

 345, 34'^ ; of lung-fish, 343, 344. 



Argonanta, 268, 273. 



Argulus, 304. 



Aridity, its bearing upon the extinction 

 of life, 375- 



Aristotle's lantern, 168; use of, 169. 



Armadillidium, 306. 



Armadillos, 382. 



Arm-bone, see humerus. 



Arrowhead, 272. 



Arsinoitherium, 389. 



Artemia, 285, 299. 



Arteries, in the arthropods, 281 ; in the 

 mollusks, 212, 237, 257; in the verte- 

 brates, 332. 



Arthrophycus haHani, 40. 



Arthropod skeleton compared with that 

 of vertebrates, 274. 



Arthropoda, 274-320; skeleton of, etc, 

 see arthropods. 



Arthropods, 274-320; classification of, 

 275; descent of, 274; evolution of, 

 ^74 ; geologic range of, 409 ; in evolu- 



tion, 83; molting of, 274; skeleton 

 of, 274. 

 Articular bone, of birds, 3/^ ; of reptiles, 



367- 



Articulata (brachiopods), 189, 190, 191, 

 192, 195-204. 



Artiodactyla, 396-398 ; see also artio- 

 dactyls. 



Artiodactyls, 396-398 : evolution of 

 teeth of, 396 ; geologic range of, 396 ; 

 stomach of primitive, 397. 



A scar is liimbricoides, 141. 



Ascidians, 322. 



Aseptata, 131. 



Asexual stage, of plants, 42 ; of pterido- 

 phytes, 45 ; of seed-plants, 56 ; of 

 spermatophytes, 56. 



Assimilation, see also under the various 

 classes; in Am(Bba, 86; in Protozoa, 

 86. 



Astacidae, 307. 



Astacus, 275; distinguished from Cam- 

 barus, 307. 



Asterias Jorbesi, 149-154, 150, 163; 

 A. vulgaris, 163; blood circulation of, 

 152; digestion of, 152; eye of, 153; 

 food of, 151 ; growth of, 153 ; locomo- 

 tion of, 151 ; method of eating, 151 ; 

 nervous system of, 152; regeneration 

 of, 153; reproduction of, 153; res- 

 piration of, 152 ; sense organs of, 153 ; 

 skeleton, 151 ; water vascular system 

 of, 150. 



Asteroidea, 163-165; digestion, etc. 

 see Asterias; fossils of, 163-165; 

 geologic range of, 163, 409. 



Astragalus bone, in the cat, 327. 



Astrangia dance, 122-127, 123; "blood" 

 of, 124; circulation of "blood," 

 124; digestion of, 124; food of, 

 124; growth of colony of, 127; 

 muscles of, 124; nerves of, 125; 

 polyp of, 123; respiration of, 124; 

 sense organs of, 125; sexes in, 125; 

 waste excretion of, 124. 



Astroides calicularis, 126. 



Astromma, 94. 



A stylos pongia, 97, 105; A. prcemorsa, 

 106. 



Athyris, 190. 



Atlantosaiirus immanis, 361. 



Atlas bone, of the cat, 325. 



