INDEX — GLOSSARY 



429 



Hydrotheca, lOQ, 113, iiq, 120. 



Hydrozoa, 108-121; digestion, etc., see 

 Sertularia; fossil, 113-121; geologic 

 range of , 40Q ; ocelli in, iii; otocysts 

 in, iii; sense organs in, iii; sub- 

 divisions of, 113; survey of, 112. 



Hylobates, 400. 



Hylonomus, 352. 



Hymenoptera, 78, 318. 



Hyoid bone, of the cat, 325, 326. 



Hyolithes, 249. 



Hyomandibular, 339. 



Hyponome, in Ammonoidea, 263 ; in 

 cephalopods, 255. 



Hyponomic sinus, 255 ; in Ammonoidea, 

 263. 



Hypostome, in crustaceans, 280, 286, 

 287. 



Hyrachyus eximius, 380. 



Hyracoidea, 385-386; evolved from, 

 385 ; geologic range of, 385. 



Hyracotherium, jqj. 



Hyrax, 386. 



Ichthyopterygia, 358, 3^8; decline of, 

 367 ; habitat, etc., see ichthyosaurs. 



Ichthyopterygians ; see Ichthyopterygia. 



Ichthyornis, 371; /. victor, 372; asso- 

 ciated with ammonites, 372 ; brain and 

 skull of, 372 ; compared to tern and 

 alligator, 372. 



Ichthyosauria, the ichthyosaurs. 



Ichthyosaurs, 358, 358; compared to 

 whales, 358 ; decline of, 367 ; deriva- 

 tion of, 358 ; evolution in, 359 ; geo- 

 logic range of, 358; habitat of, 358; 

 production of young, 358; sclerotic 

 plates in, 335. 



Ichthyosaurus, 359; /. quadriscissus, 358. 



Ichthyotomi, 341 ; fins in, 340. 



Ilium, of birds, 372 ; of cat, 325, 328 ; 

 of mammals, 323, 328, 385 ; of reptiles, 

 360, 366, 367. 



Impunctate, lacking minute scattered 

 pits. 



Inadaptation, in the extinction of the 

 species, 374. 



Inarticulata, 189, 190, 191, 192, 195; 

 vitality of, 191. 



Incisor teeth, 331 ; evolution in, 332 ; of 

 cat, 331 ; of cow, 332 ; of cud-chewing 

 mammals, 332; of elephant, 332; 



of rodents, 381 ; of sheep, ^,2,2 ; recapit- 

 ulation in, T,r:,2. 



Incurrent canals, qq, 100. 



Incurrent siphon, in pelecypods, 209, 

 20Q, 211, 212. 



Index fossils, 22, 2^, ; ammonites as, 263 ; 

 Belemnites as, 272. 



Infertility, some causes of, in mammals, 

 376. 



Infraclavicle, in fishes, 346. 



Infusoria, 95, 184; food of Teredo, 233; 

 geologic range of, 409. 



Infusorians, the- Infusoria. 



Injury of soft parts of body reflected in 

 the shell, 18, 184. 



Ink sac of cephalopods, 268, 270 ; fossil, 

 269. 



Innominate bone, 323 ; of cat, 325, 328. 



Inoceramus, 223-224, 267 ; /. barabini, 

 224; internal ligament of, 221. 



Inorganic fossil objects, 20. 



Inorganic matter, growth of, 2 ; vs. 

 organic matter, i. 



Insect, paradoxical, 294. 



Insecta, 275, 317-320; 5ee insects. 



Insectivora, 379; Eocene, closely re- 

 lated to Creodonta, 379 ; geologic 

 range of, 379; in evolution, 399. 



Insects, 317-320; ancient forms gen- 

 eralized, 318; comparison of respira- 

 tion to that of birds, 370; develop- 

 ment of, 317; evolution of, 274; 

 famous localities for fossil, 318 ; flower- 

 loving, 78 ; fossilization of wings of, 

 317; geologic range of, 318, 409; in 

 amber, 10; in evolution, 83; meta- 

 morphosis in, 317 ; probable ancestors 

 of winged, 318; respiration of, 317; 

 compared to that of the vertebrates, 

 317; sexes of, 317; summary of 

 orders of, 318-320; tracheae of, 317. 



Integument, a natural covering, as 

 the skin ; preservation of form of, in 

 reptiles, jq, 358. 



Interambulacrum (plu. interambulacra), 



of echinoids, 167, 170. 

 Intermedium bone, in turtles, 366. 

 Internal mold, 14, 246. 

 Interradial plates, 138. 

 Introduction, 1-27. 

 Introvert, of gastropods, 235, 236. 

 Invertebrate animals, restoration of, 17. 



