INDEX 



633 



tentacles in, 275. 

 trocholophus stage in, 278. 

 Terebraiella, 231, 238, 246, 294, 295, 296, 

 297, 299, 303, 308. 



attachment of loop in, 292. 

 bouchardiform stage of, 301. 

 Buckmani, 301. 

 chiliensis, 293. 

 cruenta, 301. 



adult characters of loop in, 295. 

 development of, 294. 

 deltidial plates in, 391. 

 descending lamellae in, 292. 

 development of, 293. 

 dorsata, 292, 297, 301, 407. 



adult characters of loop in, 295. 

 brachial supports in, Fischer 



and (Ehlert, 406. 

 development of loop in, Fischer 



and (Ehlert, 293. 

 different stages of, 295. 

 furcata, 300. 

 obsoleta, 407. 

 occidentalis, 407. 



var. obsoleta, 297, 406. 

 rubicunda, 301. 



adult characters of loop in, 295. 

 development of, 294. 

 transversa, gerontic period in, 269. 

 TerebratellidEe, 271, 279, 283, 292, 293, 

 296, 297, 299, 301, 406, 412. 

 boreal stock of, 306. 

 brachial .supports in, 410. 

 brachidium in, 281. 

 cistelliform stage in, 278. 

 defined, 307. 

 development of, 299. 

 gwyniform stage in, 407. 

 King, 292. 

 loop in, 291. 

 lophophore in, 280. 

 metamorphoses in, 287.^ 

 period of reproduction in, 289. 

 septum in, 306. 

 specific characters in, 289. 

 stages of growth in, 291, 302. 

 terebratelliform stage, 292. 

 Terebratula, 246, 257, 291, 392, 395, 

 399. 



deltidial plates in, 386, 395. 

 development in, 383, 385. 

 septigera, 291, 297. 



transversa, 291. 



Whitfieldella, deltidial plates in, 391. 

 TerebratuliB, 411. 



umbo in ventral valve of, 394. 

 Terebratulacea, brachidium in, 274. 



zugolophus stage in, 281. 

 Terebratulida;, 283, 290, 291, 292. 

 brachial supports in, 410. 

 centrouelloid loop in, 413. 

 coiled arm in, 276. 

 defined, 306. 

 deltidial plates in, 266. 

 deltidium in, 393. 

 extinct genera of, 305. 

 loop in, 290. 

 lophophore in, 280. 

 Terebratidina, 231, 238, 246, 247, 284, 

 291, 293, 387. 

 arm development in, Morse, 274. 



structure of, 276. 

 attachment of, 256. 

 blastula cavity in, 248. 

 brachia in, 279. 



bristles on cephalic segment of, 249. 

 calcareous loop in, 281, 282. 

 cancellata, adult, 280. 

 capitt-serpentis, var. septentrionalis, 



296. 

 cirri in, 291. 

 coiled arm in, 276. 

 development of, Morse, 238. 

 difference in valves in, 234. 

 dorsal pedicle muscles in larva of, 



251. 

 fleshy portion of arms in, Hancock, 



292. 

 growth of loop in, Morse, 291. 

 incipient stage of, Morse, 386. 

 larval features in, 291 

 loop in, 292, 293. 

 mesembryo in, 248. 

 metembryo in, 248. 

 outline and hinge in, 238. 

 pedicle in, 235. 



-opening in, 242. 



plectolophus stage in, 284. 



schizolophus stage in, 278. 



septentrionalis, absence of deltidial 



plates in youug, 262. 



beak of, 263. 



crura in nepionic stages of, 

 Morse, 268. 



