PALEONTOLOGICAL INDEX 



Figures in bold face indicate principal discussion. 



Acidaspis, 355. 



ulrichi, 117, 182, 355. 

 Acrotretidse, 234. 

 Actinoceratidse, 328. 

 Actinostroma trentonensis, 192. 

 Alecto inflata, 212. 

 Algse, 82, 85, 189. 

 Allonychia, 284. 



ovata, 170, 178, 284. 

 Ambonychia cincinnatiensis, 282. 



radiata, 282. 

 Ambonychiidffl, 282. 

 Amphilichas, 354. 



cf. trentonensis, 136. 



trentonensis, 165, 166, 182, 354. 

 Amphion salteri, 359. 

 Ampyx, 336. 



cf. A. normalis, 142. 



halli, 124, 337. 



(Lonchodomas) halli, 128, 182, 337. 



(Lonchodomas) normalis, 140, 180, 

 336. 



normalis, 336. 

 Amygdalocystidse, 141. 

 Anastrophia hemiplicata, 20U. 

 Anodontopsis (Modiolopsis) unionoides, 

 281. 



unionoides. 281. 

 Anolotichia, 135. 

 Anthozoa, 198. 

 Aparchites, 137, 366. 



minutissimus, 169, 182, 366. 

 Archeocyathus, 66. 

 Arthroclema spiniformis, 228. 

 Arthropoda, 332. 

 Arthropora, 224. 



bifurcata, 143, 176, 224. 



cleaveland, 169, 176, 225. 

 Arthrostylidse, 227. 

 Asaphellus, 345. 



gyracanthus, 100, 182, 345. 

 Asaphidse, 342. 

 Asaphus canalis, 345. 



convexus, 347. 



gyracanthus, 347. 



(Isotelus) megistos, 343. 



marginalis, 346. 



trentonensis, 354. 



Aspidobranchia, 289. 

 Atremata, 23O. 

 Atrypa exigua, 273. 



heiniplicata, 269. 



modesta, 274. 



plena, 270. 



recurvirostris, 272. 

 Avicula demissa, 284. 

 Aviculidae, 284. 



B 



Bathyuridae, 34O. 

 Bathyurus, 136, 347. 



caudatus, 340. 



conicus, 340. 



levis, 347. 

 Bastostoma, 22O. 



cf. B. magnoporum, 135. 



irrasa, 218. 



jamesi, 169, 174, 22O. 

 Batostomellidse, 221. 

 Beatricea, 137, 148, 150. 

 Bellerophon bilobatus, 313. 



cancellatus, 313. 



sulcatinus, 309. 

 Berenicea, 214. 



veslculosa, 169, 174, 214. 

 Beyrlchia chambers!, 369. 

 BeyrichiidfE, 367. 

 Billingsellidsa, 237. 

 Bolboporites, 141. 

 Brachiopocla. 23O. 

 Branchiopoda, 362. 

 Bryozoa, 212, 220. 

 Bucania, 3O9. 



champlainensis, 309. 



sulcatina, 124, 128, 180, 3O9. 

 BucaniidfB, 3O9. 

 Bumastus, 351. 



milleri, 351. 



trentonensis, 164, 166, 182, 351. 

 Byssonychia, 282. 



praecursa, 170. 178, 283. 



radiata, 178, 282, 283. 



vera, 169, 178, 282. 

 Bythocypris, 371. 



cylindrica, 169, 182, 371. 

 Bythopora, 221. 



arctipora, 169, 174, 221. 



