12 H. Doc. 129. 



This species resembles, in its divaricating strise, N. divaricata of 

 the Oregon Miocene ; but the lines are proportionally larger, and the 

 shell is smaller and different in outline. 



CORBULA. 



17. c. DIEGOANA, Con., pi. 2, fig. 16. Triangular, ventricose, in- 

 equilateral, extremities subangulated ; anterior margin very oblique, 

 rectilinear ; posterior margin forming with the ligament margin a 

 slightly curved line, about equal in obliquity to the anterior margin ; 

 basal margin profoundly and nearly equally or regularly rounded. 



Locality. Mission of San Diego. 



MERETRIX, Lam. 



18. M. UNIOMERIS, Con., pi. ii, fig. 20. Ovate, very inequi- 

 lateral, convex ; posterior side cuneiform ; ligament margin very 

 oblique, rectilinear ; posterior extremity truncated, direct ; beak dis- 

 tant from anterior margin. 



Locality. Monterey county, 18 miles south of Tres Pinos, in sand- 

 stone. 



19. M. DECISA, Con., pi. ii, fig. 27". Subquadrate, convex, very 

 inequilateral ; ligament slope very oblique, nearly straight ; posterior 

 extremity truncated ; cardinal and lateral teeth robust. (Cast.) 



Locality. Ocoya creek, in friable ferruginous coarse sandstone. 

 (For the associate fossils, see plates vi, vii, and viii.) 



20. M. TULARANA,, Con., pi. ii, fig. 22 and 22a. Suboval or subtri- 

 angular, inequilateral convex anteriorly ; compressed and cuneiform 

 posteriorly, anterior extremity acutely rounded and as nearly in a line 

 with the beak as the base ; basal margin tumid medially ; posterior 

 extremity subtruncated. 



Locality. Tulare valley. 



[NOTE. This specimen is a clay cast, and was found in a boulder 

 that had been washed down from the hills at the head of the Tulare 

 valley, about twenty miles west of the Canada de las Uvas. 



W. P. B.] 



TELLINA, Lin. 



21. T. DIEGOANA, Con., pi. ii, fig. 28. Ovate-eliptical, compressed, 

 inequilateral, concentrically striated. Slope carinated ; posterior ex- 

 tremity suddenly produced or rostrated, and below the posterior basal 

 margin. 



Locality. San Diego, in sandstone. 



22. T. CONGESTA, Con., pi. ii, fig. 14, 18, 21. Subtriangu- 

 lar, ventricose, inequilateral ; anterior margin obliquely truncated ; 

 anterior basal margin sub-rectilinear, oblique, extremity angulated, 



