Quarterly Journal of Gonchology. 31 



Pupa umbilicata, Drapamand. — Castle Hill and Black Eock. 

 Fairly plentiful. 



Pupa marginata, Drapamand. — Castle Hill and Black Rock. Not 

 very plentiful. 



Cyclostoma eleganSj Muller. — Giltar ; somewliat plentiful. 



MARINE. 



Anomia ephippium, Linne. — Deep water ; dredged. 



Anomia ephippium var aculeata, Linne. — Deep water ; dredged. 



Pecten opercularis, Linne. — Deep water ; from the dredgers. 



Pecten varius, Linne. — Deep water; from the dredgers. 



Mytilus edulis var incurva, Pennant. — Along the shore. In 

 holes in the rocks. 



Cyprina islandica, Linne. — Deep water ; from the dredgers. 



Calyptr^ea chinensis, Linne. — Deep water; from the dredgers. 



Tapes virgineus, Linne. — Deep water ; from the dredgers. 



Tapes pullastra, Montagu. — Deep water ; dredged. 



Chiton (? species). — Deep water ; dredged. 



Patella vulgata var intermedia, Jeffreys. — North Shore ; 

 common. 



Patella vulgata var cerulea, Linne. — Giltar ; common. 



LiTTORiNA neritoides, Linne. — On rocks near Merlin's Cave. 

 Plentiful here. 



Littorina rudis, var. — North Shore. On rocks ; common. 



LiTTORiNA LiTOREA, Linne. — Giltar and North Shore. On rocks ; 

 common. 



Purpura lapillus, Linne. — North Shore and Giltar; very plentiful. 



A PARTIAL COMPARISON OF THE GONCHOLOGY OF 

 PORTIONS OF THE ATLANTIC AND PACIFIC 

 COASTS OF NORTH AMERICA. 



By ROBERT E. C. STEARNS. 



[From the Pkoceedixgs of the California Academy of Sciences, Oct. 7, 1872.] 



A striking feature in the Conchological fauna of that part of the 

 Pacific coast included in the Californian and Vancouver zoological 

 province, when compared with the molluscan fauna of the Atlantic 

 coast from the Arctic seas to Georgia, is the preponderance in the 

 former of those forms of molluscan life which are embraced in the 

 order of Scutibranchiata.* 



The Scutibranchiate Gasteropods, or shield-gilled crawlers, com- 

 prise a great number of mollusks, all of which are marine, and which 

 inhabit the sea shore, principally the littoral and laminarian zones, 

 subsisting on marine vegetation. Thus we find the beautiful group of 

 Calliostoma upon the larger alga), as well as the unique Troclnscus 



* Vide Adams' " Genera of Recent MoUusca," vol. i., p. 376. 



