632 



INDEX 



Stricklandinia, 245. 



dorsal fissure in, 263. 

 Stringocephalinae, 291. 



defined, 307. 



Stringocephalus, 246, 291, 305, 307. 

 Strombus pugilis, spiniform prominences 



on, 46. 



Strophalosia, 69, 70, 96, 239, 245, 260, 

 395. 



hinge in, 236. 



-line in neanic stages of, 237. 

 keoJcuk, spines in, 69. 

 succession of species in, 236. 

 Stropheodonta, 231, 245. 



absence of straight hinge-line in 



young, 268. 



cavity of pedicle-sheath in, 395. 

 deltidial plates in, 395. 

 deltidium of, 386. 

 dorsal beak in, 264. 

 pedicle-opening in, 241. 

 profunda, 315. 

 spiniform processes in, 78. 

 striata, 330. 

 Strophomena, 231, 245, 252, 395. 



absence of punctas in deltidium of, 

 260. 

 of straight hinge-line in young, 



268. 



deltidium of, 386. 

 dorsal beak in, 264. 

 Paterina-like stage in, 268. 

 pedicle-opening in, 241. 

 rhomboidalis, 322. 

 teeth in, 252. 

 Strophomenacea, specific differentiation 



in, Schuchert, 96. 

 Strophomenidae, 387, 394. 



absence of embryonal sinus in, 388. 

 cardinal area of, 390. 

 deltidial development in, 393. 

 hinge, fissure, and callosity in, 333. 

 Strophonella, 245, 387. 

 semifasciata, 315. 

 striata, 315, 327. 



discussion of, 330. 

 groove in, 333. 

 hinge in, 333. 

 Stygina, 146. 



fixed-cheeks in, 127. 

 Stylonurus, tail spine in, 84. 

 Suessia, 246. 



symmetry, radial, application of law of, 

 to Brachiopoda, 236. 



law of, Haeckel, Jackson, 



Korshelt, Heider, 236. 

 Symphoria, 156. 



accessory lobes in glabella of, 157. 

 Symphysurus, 146. 

 Syringopora, 425, 426. 



erect growth in, 427. 

 Syringothyris, 246. 



high hinge-area in, 266. 



tachy genesis, 128. 



taxolophus stage, 277. 



Technocrinus spinulosus, spines in, 50. 



Telephus, 142. 



Telotremata, 242, 247, 260, 282. 



defined, 245. 

 tendrils, 88. 

 Terataspis, 70, 150. 



extremes of spinosity in, 56. 

 glabella in, 150. 



Terebratalia, 288, 292, 299, 301, 303, 306, 

 308. 



adult loop in, 291. 

 cistelliform stage in, 408. 

 coreanica, adult characters of loop 

 in, 295. 



condition in, 299. 



frontalis, adult characters of loop 

 in, 295. 



condition in, 299. 

 gwyniform stage in, 408. 

 Marice, 299. 

 new genus, 297. 

 obftoleta, 297, 407, 409. 



adult condition in, 299. 

 development of, 298, 406. 

 lophophore in, 280. 

 metamorphoses of, 407. 

 septum in platidiform stage of, 



409. 

 spitzbergensis, 299. 



adult characters of loop in, 295. 

 stage in Macandrevia and Dallina, 



299. 

 transversa, 297. 



adult characters of loop in, 295. 

 condition in, 299. 



