ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA, 595 
period the coast-range was entirely under water. The Miocene beds are 
above 2000 feet in thickness, and abound in fossils generally distinct from 
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. 189-196. 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 
the eastern and western beds, for the extraordinary development of Pecti- 
nide, both in number, in size, and in the exemplification of typical ideas.” 
It also appears to be peculiarly rich in Arcade, which are now almost 
banished from that region, while they flourish further south. The large 
Amusium caurinum and the delicate Pecten hastatus of the Vancouver district, 
as well as the remarkable Janira dentata of the Gulf, may be regarded as a 
legacy to existing 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 subcostata”’) were believed to be distinct from those collected 
by the preceding naturalists. 
Dr. Antisell’s Californian Fossils, 
Page. Plate. Fig. ; 
190. ; Hinnites crassa, Cour. [?=H. gigantea, Gray.| Sta. Mar- 
[I. err. typ.] garita. 
. 1. Pecten Meekii, Cony. San Raphael Hills. 
Pecten deserti, Cony. Blake’s Col., p. 15. Corrizo Creek. 
Pecten discus, Conr. Near Sta. Inez. 
Pecten magnolia, Cony. [Probably= P. Jeffersonius, Say, Vir- 
ginia.| Near Sta. Inez. 
Pecten altiplicatus, Conr. San Raphael Hills. 
Pallium Estrellanum, Cony. [Janira.| Estrella. 
Spondylus Estrellanus, Cony. [?Janira.| Estrella. 
Tapes montana, Conr. San Buenayentura. 
Tapes Inezensis, Cony. Sta. Inez. 
Venus Pajaroana, Cony. Pajaro River. 
Arcopagia unda, Conr. Shore of Sta. Barbara and Estrella, 
[Closely resembles A. biplicata ; ? = Lutricola alta. | 
Cyclas permacra, Cony. Sierra Monica, Resembles C. pan<= 
duta, Conr.,= Lucina compressa, Lea. 
Cyclas Estrellana, Cony. Estrella. 
Arca Obispoana, Conr. San Luis Obispo. 
Pachydesma Inezana, Cony. [Like P. crassatelloides.| Sta. 
Inez Mts. 
Crassatella collina, Cony. Sta. Inez Mts. 
Ostrea subjecta, Conr. “ May be the young of O. Panzana.”’ 
Sierra Monica, 
Ostrea Panzana, Cony. Panza, Estrella, and Gayiote Pass. 
Dosinia alta, Cony. Salinas River. 
Dosinia longula, Conr. Salinas River. 
Dosinia montana, Conr. Salinas River. 
Dosinia subobliqua, Cony. Salinas River. Also a small Venus, 
a Natica, and a Pecten. 
Mytilus Inezensis, Conr. Sta. Inez. 
LIutraria transmontana, Cony. Allied to LZ. papyria, Conr. 
Los Angeles; also San Luis, 
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