62 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Type: — No. 124, and cotypes Nos. 125 and 126, Cal. Acad. 

 Sci., in bed of small creek, near the center of Sec. 34, T. 28 S., 

 R. 15 E., San Luis Obispo County, California. Coll., Bruce 

 Martin. 



Tellina wilsoni, new species 

 Plate 3, figures 11a and lib. 



Shell small, eight to ten millimeters in length, convex, moder- 

 ately inflated ; valves unequal, inequilateral ; beaks conspicuous, 

 within the posterior third ; anterior dorsal margin long and 

 straight, nearly parallel to the base; anterior extremity well- 

 rounded ; basal margin very slightly arcuate ; posterior dorsal 

 margin truncated, sloping sharply downward to the posterior 

 extremity which is sharply rounded into the base ; posterior end 

 compressed, flexuous, curved to the right; surface marked by 

 very fine concentric lines of growth which are usually invisible 

 to the unaided eye. 



Dimensions : — Length of the type specimen, 9 mm. ; altitude, 

 6 mm. ; thickness of the right valve, 2 mm. ; thickness of both 

 valves, 43^ mm. 



Occurrence : — Not uncommon in the lower Miocene of San 

 Luis Obispo County and of the Kern River region, California. 

 The type specimen, No. 127, Cal. Acad. Sci., was obtained from 

 locality 126. 



Genus SEMELE Schum. 



Semele morani, new species 



Plate 3, figure 4. 



Shell of moderate size, compressed, thin, subelliptical in out- 

 line; valves equal, convex, inequilateral, the anterior end 

 slightly longer than the posterior ; extremities well-rounded ; 

 ventral margin arcuate ; beaks prominent, turned forward, ex- 

 cavated in front ; anterior dorsal margin broadly convex ; pos- 

 terior dorsal margin nearly straight; lunule long and narrow, 

 sunken, surface marked by numerous concentric lines of 

 growth; a prominent flexure or furrow extending from the 

 beaks to the posterior ventral margin ; interior inaccessible. 



