INDEX — GLOSSARY 



443 



Scriuus, 382. 



Sclerotic coat of eyeball, 334 ; see also 

 sclerotic plates ; in the cat, 334 ; in 

 the Monotremata, 335 ; in the Stegoce- 

 phalia, 335. 



Sclerotic plates of eyeball, 335; in 

 chelonians, 335 ; in Ichthyosauria, 

 335 ; in lizards, 335 ; in modern birds, 

 335 ; in mosasaurs, J67 ; in Stegoce- 

 phalia,.335. 



Scolithus, 17. 



Scorpio, 314; see also scorpions; com- 

 parison with Limulus, 309-311; evo- 

 lution of, 310; recapitulation in, 310; 

 relationship to eurypterids and Limu- 

 lus, 310; relation to trilobites, 311. 



Scorpionida, 314; see also Scorpio and 

 scorpions; geologic range of, 314. 



Scorpions, evolution from water to land 

 life, 310; Silurian, 310. 



Scyphozoa, 121-122; fossils of, 121, 

 122 ; geologic range of, 409. 



Sea anemone, 128, 133, 134. 



Sea-buds, 157-159; the Blastoidea. 



Sea-cat, 343. 



Sea cows, 398 ; evolution of, 398 ; geo- 

 logic range of, 398. 



Sea cucumbers, 171- 172; fossil, 172; 

 impressions of, 18. 



Sea-hares, 243. 



Sea-lilies, 159-163. 



Sea-squirts, 322. 



Sea urchins, 165-171 ; see also tch.\noids; 

 respiration, etc., see Strongylocentrotus ; 

 trails of, 16. 



Seals, 381 ; habitat of, 374. 



Seaweeds, 147, 159, 160. 



Secretion of lime, in algae, 38 ; in corals, 

 125 



Sectorial teeth, 381 ; characteristic of 

 Carnivora, 332 ; of the cat, 331. 



Sedentary, stationary, not moving from 

 place to place. 



Sedge, 77, 78. 



Seed, food for embryo in, 77 ; in angio- 

 sperms, 76, 77 ; in the spermatophytes, 

 56; plants, 51, 55-82. 



Seed plants, 51, 55-82; see Sperma- 

 tophyta. 



Segments, of the crayfish body, 275 ; 

 of the trilobite skeleton, 291. 



Selachii, 342. 



Selaginella, 51, 52. 



Semi-circular canals, 335 ; of man com- 

 pared to the otocyst of crustaceans, 



283. 

 Semionotus, 347; 5. lenticularis, 347. 

 Sense organs, see also under the various 



classes; inHydrozoa, in ; in medusae, 



III. 

 Sensitive fern, 43, 46, 47, 48. 

 Sepia, 272; coloring matter from, 272; 



guard of, 272; proostracum (pen) of, 



272; S. officinalis, 272. 

 Sepioids, including cephalopods like 



Sepia; si ph uncle of, 261. 

 Septum (plu. septa), of Belemnites, 271, 



272; of cephalopods, 251, 252; of 



corals, 123, 126, 126, 128. 

 Sequoia, 73, 74 ; S. gigantea, 73 ; S. langs- 



dorfii, 74; S. magnifica, 71, 72, 74; 



S. sempervirens, 73 ; age of, 73 ; dis- 

 tribution of, present and past, 73, 74. 

 Serpula, 146. 

 Sertularia, S. pumila, 108-112, 109, 114; 



compared with a graptolite, 113-115; 



digestive cavity of, ioq ; food of, 109 ; 



gonotheca of, ioq ; hydrotheca of, 109 ; 



muscles of, no; nerves of, 100; 



polyp of, ioq; reproduction of, no; 



respiration of, no. 

 Sesamoid bones, bones developed in 



tendons where there is much move- 

 ment; of mammals, 595; pisiform, 



J95; ulnar, 393. 

 Sessile, attached by a broad base, not 



by a stalk. 

 Seta (plu. setae), 189, IQ3. 

 Sexes, see under the various classes. 

 Sexual stage, in bryophytes, 45 ; in 



plants, 44 ; in pteridophytes, 45 ; 



in seed-plants, 56 ; in spermatophytes, 



56. 

 Shagreen, 341. 

 Sharks, 341, 343; Port Jackson, 342; 



Carcharodon, 342; parasites in, 305. 

 Shawangunk formation, fossils from, 313 ; 



geologic age of, 313. 

 Sheep, 398; parasites in, 140. 

 Shell-building glands, in pelecypods, 214 ; 



in mollusks, 207. 

 Shell gland, in mollusks, 207. 

 Shells, formation of, i ; growth of, in 



pelecypods, 210, 214-216, 2/5; section 



