240. Cardium obovale, Brod. fr Sby. 



241. Cardium panamense, Sby. 



242. Cardium procerum, Sby. 



243. Cardium rotundatum, Cpr. 



244. Cardium senticosum, Sby. 



Lucinidae. 



245. Codakia punctata, Linn. 



246. Codakia tigerina, Linn. 



247. Lucina annulata, Rve. 



248. Lucina artemidis, Cpr. 



249. Lucina eburnea, Rve. 



250. Lucina excavata, Cpr. 



251. Lucina fenestrata. 



252. Lucina mazatlanica, Cpr. 



253. Lucina muricata, Chemn. 



254. Lucina pectinata, Cpr. 



255. Lucina prolongata, Cpr. 



Diplodoutidae. 



256. Diplodpnta calculus, Rve. 



257. Diplodonta obliqua, Phil. 



258. Diplodonta semiaspera, Phil. 



259. Diplodonta subquadrata, Cpr. 



260. Felania cornea, Rve. 



261. Felania serricata, Rve. 



262. Felania tellinoides, Rve. 



Kelliadae. 



263. Kellia suborbicularis, Mont. 



264. Lasea oblonga, Cpr. 



265. Lasea ?rubra, Mont. 



266. Lasea trigonalis, Cpr. 



267. Lepton clementinum, Cpr. 



268. Lepton dionaeum, Cpr. 



269. Lepton obtusum, Cpr. 



270. Lepton umbonatum, Cpr. 



271. Pythina sublaevis, Cpr. 



272. Montacuta chalcedonica, Cpr. 



273. Montacuta elliptica, Cpr. 



274. Montacuta subquadrata, Cpr. 



275. Scintilla Cumingii, Desk. 



276. [Cycladella papyracea.] 



Mytilidae. 



277. Mytilus multiformis, Cpr. 



278. Mytilus palliopunctatus, Dkr. 



279. Septifer Cumingianus, Dkr. 



280. Modiola braziliensis, Chemn. 



281. Modiola capax, Conr. 



282. Modiola mutabilis, Cpr. 



283. Crenella coarctata, Dkr. 



284. Lithophagus aristatus, Sol. 



285. Lithophagus attenuatus, Desh. 



286. Lithophagus calyculatus, Cpr. 



287. Lithophagus cinnamomeus, L. 



288. Lithophagus plumula, /7dn&, 



289. Leiosolenus spatiosus, Cpr. 



Arcadae. 



290. Area cardiiformis, Sby. 



291. Area concinna. 



292. Area formosa, Sby. 



293. Area grandis, Brod. fr Sby. 



294. Area multicostata, Sby. 



295. Area tuberculosa, Sby. 



296. Scapharca bifrons, Cpr. 



297. Scapharca emarginata, Sby. 



298. Scapharca labiata, Sby. 



299. Scapharca nux, Sby. 



300. Noetia reversa, Gray. 



301. Argina brevifrons, Sby. 



302. Byssoarca alternata, Sby. 



303. Byssoarca aviculoides, Rve. 



304. Byssoarca gradata, Brod. fr Sby 



305. Byssoarca illota, Sby. 



306. Byssoarca mutabilis, Sby. 



307. Byssoarca pacifica, 6y. 



308. Byssoarca Reeviana, D Orb. 



309. Byssoarca solida, Sby. 



310. Byssoarca vespertilio, Cpr. 



311. Axinaea bicolor, Rve. 



312. Axinaea gigantea, /foe. 



313. Axinaea inaequalis, Sby. 



314. Axinaea maculata, Brod. 



315. Axinaea multicostata, Say, 



316. Axinaea parcipicta. 



317. Axinaea pectenoides. 



318. Nucinella 



JVuculidae. 



319. Nucula exigua, Sby. 



320. Leda costellata, Sby. 



321. Leda crispa, Eds. 



322. Leda elenensis, Sby. 



323. Leda excavata, Hds. 



324. Leda gibbosa, Sby. 



325. Leda lyrata, Eds 



326. Leda polita, Sby. 



Aviculidae. 



327. Pinna lanceolata, Sby. 



328. Pinna maura, Sby. 



329. Pinna rugosa, Sby. 



330. Pinna tuberculosa, Sby. 



331. Avicula sterna, Old. 



332. Margaritiphora fimbriata, Dkr 



333. Isognomon Chemnitzianus, 



334. Isognomon janus, Cpr. ID Orb. 



Pectenidae. 



335. Pecten circularis r 5%. 



336. Pecten fasciculatus, lids. 



337. Pecten nodosus, Ln. 



338. Pecten subnodosus, Sby. 



339. Pecten tumbezensis, Z&amp;gt; 0r&. 



340. Pecten ventricosus, Sby 



