ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 59; 



period the coast-range was entirely under water. The Miocene beds ar< 

 above 2000 feet in thickness, and abound in fossils generalh- distinct fronj 

 those of the eastern strata. There is nothing in California answering to the 

 Northern Drift of the countries bordering on the Atlantic. The molluscs of 

 Dr. Antisell's Survey were described by Mr. Conrad, pp. 18!)-15)(). He 

 remarks that " the fossils of the Estrella Valley and Sta. Inez Mountains are 

 quite distinct from those of the Sta. Barbara beds, and bear a strong resem- 

 blance to the existing Pacific fauna. The Miocene period is noted, both in 

 t;ie eastern and western beds, for the extraordinarj- development of Fecti- 

 ni'fcf, both in number, in size, and in the exemplification of typical ideas." 

 It also appears to be peculiarly rich in Arcadce, which are now almost 

 banished from that region, while they flourish further south. The laige 

 Ainusium cuurinum and the delicate PecUn hastatiis of the Vancouver district, 

 as well as the remarkable Junira dentata of the Gulf, may be regarded as a 

 L'gacy to existiig seas from the Miocene idea; otherwise the very few 

 Pectinids which occur in collections along the whole West Coast of North 

 America is a fact worthy of note. Mr. Conrad has " no doubt but that the 

 Atlantic and Pacific oceans were connected at the Eocene period;" and the 

 fossils here described afford strong evidence that the connexion existed during 

 the Miocene epoch. All the species here enumerated (except Pecten deserti 

 and " Anomia suhcostata ") were believed to be distinct from those collected 

 by the preceding naturalists. 



Dr. AntiselVs CaJifornian Fossils. 



Hinnite^ crassa, Conr. [?=II. yif/aidea, Gray.] Sta. Mar- 



fravita. 

 Fcefen Meekii, Conr. San Raphael Hills. 

 Prden (h-serti, Conr. lUake's Col., p. \b. Corrizo Creek. 

 Pcctfn di:*cus. Conr. Near Sta. Inez. 



Pvcten nuiijndlia, Conr. [Probably = P. Jcffersonim, Say, Vir- 

 ginia.] Near Sta. Inez. 

 Pecten a'tiplicatiis, Conr. San Raphael Hills. 

 Pidlium Estrellanum, Conr. [Janira.^ Estrella. 

 Spondylus Edrellanus, Conr. \?Janira.^ Estrella. 

 Tapes moiifaiia, Conr. San Buenaventura. 

 Tapes Inezensis, Conr. Sta. Inez. 

 Veniis Pa/arofina, Conr. Pajaro River. 

 Armpnyhi vnda, Conr. Shore of Sta. Barbara and Estrella, 



[Closely resembles A. biidicata ; ? = Lutricola alfu.] 

 Cyclas permacra, Conr. SieiTa Monica. Resembles C. ;>««- 



diita, Vom:,= Luciita conipre sa, Lea, 

 Ci/clas EstreUana, Conr. Estrella. 

 Area Obispoana, Conr. San Luis Obispo. 

 Pdohtiiii.^rtta Iiiezaiia, Conr. [Like P. crassatelloides.'] Sta. 



Inez Mts. 

 Crassattiia eollina, Conr. S+a. Inez Mts. 

 Oitrea stib/'ecta, Conr. " May be the young of O. Panzana." 



Sierra Monica. 

 Osfrea Panzana, Conr. Panza, Estrella, and Gaviote Pass. 

 Dosinia alia, Conr. Salinas River. 

 Dostnia lonyula, Conr. Salinas River. 

 Dosinia montana, Conr. Salinas River. 

 Dosinia suhobliqua, Conr. Salinas River. Also a small !««>«, 



a Natica, and a Pecten. 

 Mytibis Inezensis, Conr. Sta. Inez. 

 Lutraria transmonfana, Coin-. Allied to L. pnpyria, Conr. 



Los Anjeles ; also San LuLa. 



6 81 



