114 



PROCEEDINGS OF THE 



[Feb., 1886. 



A NEW LAND SHELL FROM CALIFORNIA. 



BY WILLIAM G. MAZYCK. 



Selenites cselata, Mazyck. 



Shell small, depressed, brownish horn-color, with very coarse, rough, 

 crowded, sub-equidistant, irregular ribs, which are obsolete at the apex, and 

 of which there are about 76 on the body whorl ; whorls four, rounded, some- 

 what inflated below, gradually increasing, the last not descending at the aper- 

 ture ; suture impressed ; umbilicus wide, clearly exhibiting all of the volutions. 

 Aperture almost circular, slightly oblique ; peristome simple, its ends ap- 

 proaching and joined by a very thin, transparent whitish callus through which 

 the ribs are distinctly seen. 



Greater diameter, 4 mm. ; height, 1| mm. 



Santa Barbara, California, Dr. L. G. Yates. 



Hayward's. Alameda Countj^, California, W. H. Dall, United States National 

 Museum, 



SELENITES C.ELATA. 



SELENITES DUEANTI. 



This little shell is of about the size of Selenites JDuranti, Newc, but differs 

 materially from that species in its general outline, being more nearly circular 

 and of gTeater height, Duranti being planulate above ^^ith the aperture trans- 

 versely suboval, while ccdata is somewhat convex below and has the apex shght- 

 ly elevated, and its aperture is almost circular. The most marked difference 

 is, however, in the sculpture, Duranti being simply coarsely striated while this 

 spe2ies is covered, except at the ajjex, with very heavy rough ribs, presenting 

 somewhat the appearance in this respect of some forms of Patula alternata. 

 Say, by which feature it differs utterly from any of its congeners. It is a 

 much thicker shell than Duranti. 



The above figures of 8. Duro,nti were drawn from a specimen received from 

 Mr. W. G. Binney, which agrees absolutely with Newcomb's description and 

 with specimens in the Smithsonian Collection received from him. 



