Vol. IV] ANDERSON AND MARTIN— NEOCENE RECORD 61 



Type: — No. 120, and cotypes Nos 121 and 122, Cal. Acad. 

 Sci., on west bank of a small canyon P/4 miles northeast of 

 Barker's ranch house, Kern County, California. Coll., Bruce 

 Martin. 



Genus TELLINA Linn 



Tellina nevadensis, new species 



Plate 2, figures 3a, 3b and 3c 



Shell large for the genus, compressed, inequilateral, inequi- 

 valve; beaks prominent; anterior end evenly rounded; ventral 

 margin broadly arcuate ; posterior end rostrate and bent to the 

 right, obliquely truncated; posterior dorsal margin straight 

 from the beaks to the truncation ; a prominent fold and a con- 

 cave flexure extending from the umbones to the posterior ven- 

 tral extremity and bordering the posterior dorsal area in either 

 valve ; right valve convex ; left valve nearly flat ; surface marked 

 with concentric ridges corresponding to the lines of growth 

 and fine radial lines which are invisible on worn specimens; 

 hinge plate narrow, with two cardinal and two lateral teeth in 

 the right valve, and two cardinal teeth in the left valve ; the pos- 

 terior cardinal in the right valve bifid ; muscular impressions 

 large and distinct ; pallial sinus very deep, extending almost to 

 the anterior adductor ; a thickened obscure ray extending 

 diagonally across the anterior portion of the shell behind the 

 anterior adductor. 



Dimensions : — Length of the type specimen, 54 mm. ; alti- 

 tude, 34 mm. ; diameter of the right valve, 7 mm. The type 

 consists of one perfect right valve which is accompanied by the 

 left valve of a cotype. Length of the largest specimen, 75 mm. ; 

 altitude, 45 mm. ; diameter, both valves, 1 1 mm. 



Occurrence: — The type specimen was obtained from the 

 lower Miocene of Kern River, California, locality 65. Other 

 specimens were obtained from the same horizon in the north- 

 eastern part of San Luis Obispo County, locality 126. 



This species resembles Macoma nasnta Conrad and Macoma 

 piercei Arnold in general outline. It may be distinguished from 

 these species by the lateral teeth in the right valve, the radial 

 sculpture, and the prominent concave flexure on the posterior 

 portion. 



