194 . PALEONTOLOGY OF THE SURVEY. 



Height If inch, length If inch. A cast with a thin chalky coating of the shell, without a 

 trace of external lines. 



DosiNiA MONTANA, PL 6, fig. 4. — Suboval, inequilateral; length greater than height; con- 

 vex ; anterior margin regularly and obtusely rounded ; posterior margin and base regularly 

 rounded ; disk concentrically sulcated ; beaks. 



Locality. — Occurs with the preceding. 



DosiNiA SUBOBLIQUA, PI. 6, fig. 5. — Obtuscly subovate, slightly oblique, convex; height 

 exceeding the length ; concentrically sulcated. 



Locality. — Occurs with the preceding. 



With these species of Dosinia occur a small Venus, a Natica, and Pecten, in limestone. 



MYTILUS, Lin. 



Mymlus Ihezensis, pi. 8, figs. 2 and 3. — Subovate-oblong ? ventricose anteriorly; compressed 

 posteriorly ; ribs radiating, numerous, bifurcated, and trifurcated near the inferior margins. 



Localities. — Santa Inez mountains and Santa Inez river. 



A few fragments of this species present the character of the ribs well defined, but the outline 

 of the shell is uncertain. 



LUTRARIA, Lam. 



LuTRARiA TRANSMONTANA, PL 5, fig. G. — Longitudinally ovate-triangular, inequilateral, 

 thin; anterior end and base regularly rounded; posterior side cuneiform, extremity rounded; 

 summits prominent ; surface concentrically indented or snbplicated, umbonal region concen- 

 trically plicated ; plicae irregular. 



Locality .—Ra,n(^ Triumpho, Los Angeles. 



This shell is allied to L. pa2)yria, Con., and is well preserved in a hard, dark-colored lime- 

 stone. There is another specimen from the shore between San Luis and Santa Barbara. 



AXINEA, Smi'. PECTUNCULUS, Lam. 



AxiNEA Barbarensis, PL G, fig. 3. — Subglobose ; equilateral ; ribs about 35, little prominent, 

 convex-depressed, interstices narrow, square. 

 Ijocality. — Occurs with the preceding. 

 Height \\ inch. 



MACTRA? 



Maotra? Gabiotensis, PL 7, fig. 4. — Triangular, equilateral; anterior extremity acutely 

 rounded, posterior extremity subangulated ; umbonal slope carinated, slightly curved. 



Locality. — Gaviote pass. 



A cast about one inch long, associated with a species oi Mytilus and In/undibtdum Gabiotensis. 

 It may belong to the genus ScMzodesma, Gray. 



riLYCIMERIS, Lam. PANOPAEA, Menand. 



Glycimeris Estrellanus, PL 7, fig. 5. — Oblong or inclined to be trapezoidal, ventricose, 

 very inequilateral, irregularly plicated concentrically, plicae more approximate and profound on 

 the umbo, valves profoundly gaping posteriorly, margin obliquely truncated ; ligament margin 

 incurved, elevated jiosteriorly. 



Locality. — Panza and Estrella valleys. 



A cast, allied to Panopaea reflexa, Say ; length 3 inches. 



