634 



INDEX 



early stages in, 280. 

 loop in, Morse, 396. 

 nepionic stages of, 268. 

 umbonal portion of adult, 262. 

 zugolophus stage in, 284. 

 teeth in, 252. 

 tentacles in young stages of, 275. 



of taxolophus in, 277. 

 tentacular multiplication in, Morse, 



407. 



trocholophus stage in, 278. 

 typembryo of, 250, 251. 

 Terebratulinse, 291, 305, 307. 



defined, 307. 

 Terebratuloidea, 246. 

 terebratuloids, septal and dental plates 



in, Waagen, 297. 

 Terebrirostris, umbo in, 394. 

 test of Crustacea, spinous prominences 



on, 9. 

 Tetracorolla, spinules in, Edwards and 



Haime, 50. 



Textularia carinata, spines in, 49. 

 folium, pairs of spines in, 44. 

 Textularia}, spines in, 44. 

 Thakops, 146. 



position of eyes in, 147. 

 Thecidea (Thecidium), 231, 239, 245, 255, 

 257, 259. 

 absence of punctae in deltidium of, 



260. 



affinities with strophomenoids, 256. 

 arm development in, Kovalevski, 



274. 



brachia in, 279. 

 cephalula of, 258. 

 characters of, Dall, 256. 

 difference of valves in, 234, 235, 236. 

 early sedentary larvae of, Kovalev- 

 ski, Lacaze-Duthiers, 256. 

 high hinge-area in, 266. 

 hinge in, 236. 

 (Lacazella) mediterranea, 258. 



lophophore in, 279. 

 lophophore in, 279, 280. 

 ptycholophus type of, 284. 

 radiata, lophophore in, 280. 

 researches on, Kovalevski, 257. 

 tentacles in, 275. 



of taxolophus in, 277. 

 trocholophus stage in, 278. 

 typembryo of, 258. 



ventral valve in, Kovalevski, 259. 

 vermicularis, lophophore in, 280. 

 Thecidella, 245. 



schizolophus stage in, 279. 

 Thecidiidae, 279. 



lophophore in, 276. 

 Thecidopsis, 245. 

 Thecospira, 246, 270. 

 thistles, spiniform bracts in, 75. 

 Thoracostraca, last pair of pleopods in, 



217. 



thorn, definition of, 9. 

 thorns, compound, on honey-locust, 

 68. 



of locust and barberry, 10. 

 thought force, 32. 



toad, horned, development of horns in, 

 47. 



extreme spinosity in, 70. 

 mimetic characters of, 63. 

 prickly scales of, 9. 

 toads and frogs, ossification of superior 



cranial walls in, Cope, 47. 

 Tornoceras, 436, 437. 



development of shell in, 435. 

 embryonal characters of, 435. 

 (Goniatites) uniangulare, 435. 

 protoconch of, 437. 

 retrorsum, differences in develop- 

 ment of, 435. 



study of, von Buch, 435. 

 var: typum, 439. 



study of, Branco, 435. 

 uniangulare, 436. 



development of, 440. 

 growth in, 435. 

 Torosaurus, 96. 

 Toxoceras, 96. 

 Toxotis, 140. 



glabella in, 140. 

 Trematis, 231, 244. 

 Trematopora echinata, spinules of, 45. 



spiculata, spinules of, 45. 

 Trematospira, 246. 

 Triarthrella, 142. 

 Triarthrida, Haeckel, 112. 

 Triarthrus, 116, 142, 145, 174, 179, 182, 

 204, 207, 208, 210, 214, 215, 221. 

 absence of eye-line in adult, 179, 



180. 



anal opening in, 209. 

 antennal organs in, 211. 



