82 CALIFORNIA ACADKMY OF SCIENCES. 



MOLLUSCA (.Continued). 



300. (P.) nilU'ri Dai.i. it BARTsrii, sp. iiov 280 



litmus ryriiiuiik-Ilii Lamakck 280 



301. (P.) ooiiicn var. vnricgnln Cakpknter 280 



Geiini) Oilostouiia Fi.k»iin« 281 



Sootiou Oilostomia (Fleming) «. » 281 



302. (O.) Icuuia Carpkntkr 281 



Section Evnlt-H A. Ahams 281 



[S. D.] (E.) Htenrusii Dai.i. & Baktsch, sp. iiov 282 



303. (E.) gouldii Carpkntek 282 



Scctiou Auiiiura Moi.lkr 282 



(S. D.] (A.) piipiforuiis Carpenter 283 



304. (A.) uuciformis Cari'kntkr, viir. nvellaun Carpenter. 283 

 Section Cbrysallida Carpenter 283 



[S. D.] (C.) diegensis Dall & Bartsch, sp. uov 284 



Section Oscilla A. Adam.s 284 



[S. D.) (0.) njquisciilpta Carpenter 284 



[S. D.) (O.) granimntospirii Dai.i. & Bartsch, sp. uov 285 



Subgenus Ivara Dai.l & Bartsch, subgeu. uov 285 



305. (I.) terricula (Carpenter) Dai.l & Bartsch 285 



SUPERFAM/LY T.fiN/OOLOSSA 285 



Family LXV. Tritonidoi 285 



Genus Tritouium Link 285 



306. gibbosus Bboderip 286 



Subgenus Prieue H. & A. Auams 286 



.S07. (P.) oregoneusis Reufield 286 



Genus Rauella Lamarck 287 



308. californica Hinds 287 



Family LX I'/. Cypraida: 288 



Genus Cypra>a LiNNfi 288 



309. spadicea Gray 288 



Geuus Trivia Gray 288 



310. californica Gray 288 



311. soluudri Gray 289 



Genus Erato Risso 289 



312. columbella Menkb 289 



Family LX VII. Triforidm 290 



Genua Triforis Deshayes 290 



313. adversa Montagu 290 



SUPERFAMILY CERITHIACEA 290 



Family LX VIII. Crrithiopsidce 290 



Genus Sella A. Adams 290 



314. assimilata C. B. Adams 290 



Family LXIX. Cerilhiidae 291 



Genus Bittium Leach 291 



315. asperum Gabb 291 



316. californicum Dall & Bartsch . . : 291 



317. filosum Gould 292 



318. quadrifilatum Carpenter (with evolutionary discus- 



sion of several species) 292 



319. rugatum Carpenter 295 



320. williamsoni, sp. nov 295 



Subgenus Styliferina A. Adams 295 



321. (S.) tenuisculpta Carpenter 296 



Genua Diastoma Deshayes 296 



.322. sp. indet 296 



Genus Cerithidea Swainson 296 



323. californica Haldemann 296 



FamUy LXX. Catcidce 297 



