NEW WEST AMERICAN MARINE MOLLUSKS 



By Paul Bartsch 

 Curator of MoUusks, United States National Museum 



Among the many lots of minute marine mollusks sent to the United 

 States National Museum for determination from time to time, there 

 have been found quite a number of new species which are here de- 

 scribed. Brief descriptions of a few of these, but not figures, have 

 been published in the Journal of the Washington Academy of 

 Sciences and in the Proceedings of the Biological Society of Wash- 

 ington, as cited under these species. 



We are much indebted for this additional knowledge of new west 

 American species, as well as for much additional information on 

 species previously described, to a number of ardent collectors of 

 mollusks. 



The greatest nimiber of those here described were collected by 

 Dr. R. H. Tremper, who secured no less than seven undescribed 

 species in a visit to San Clemente Island, as follows : 



Astyris cleTnentensis. 



Opalia treinperi. 



Aclis calif ornica. 



Odostomia {Chrysallida) treTnperi. 



Odostomia {Chrysallida) clementensis. 



Odostoniia {EvaXea) hachia. 



fRissoella calif ornica. 

 He also discovered TurhonUla (Mormula) enna and Odostomia 

 {Salassia) oena off Dead Mans Island, California. 



An exceedingly interesting sending came from Mr. Walter J. 

 Eyerdam, whose material was collected in Shuyak Strait, Afognak 

 Island, Alaska. From this sending I describe : 



TurhonUla {Pyrgolam'pros) stelleri. 



TurhonUla {Pyrgolam'pros) sJvuyakensis. 



TurhonUla {Pyrgolampros) middendorfji. 



TurhonUla {Pyrgolavipros) eyerdami. 



Odostomia {Evalea) eyerdami. 



Alvania daZli. 



No. 2660.— Proceedings U. S. National Museum, Vol. 70, Art. it 



20441—27 1 I 



