GEOLOGY DESCRIPTION OF FOSSILS. 71 



vex on the back, wider than the intervals, which are transversely striate ; anterior ribs crenate ; 

 ligament margin elevated ; posterior end obtusely rounded ; summits prominent. Length, 

 inch. Proceedings Acad. Nat. Sciences, Dec., 1856, p. 314. 

 Locality. California. Dr. Newberry. 



AXIN^A, Pali. PECTUNCULUS, Lam. 



Axincea barbarensis, PI. Ill, fig. 11. Lentiform, subequilateral, concentrically wrinkled ; 

 ribs about 37, scarcely prominent, flat, defined by an impressed line, wanting on the submargins 

 and obsolete towards the b.ise ; summits slightly prominent. 



MULINIA, Gray. 



M. densata, PL III, fig. 12. Subovate, ventricose, thick, very inequilateral ; posterior side 

 very short comparatively, contracted ; extremity subtruncated, much above the line of the base ; 

 posterior basal margin very oblique and contracted ; anterior end obliquely truncated ; anterior 

 basal margin rounded; summits prominent, distant; lateral teeth very robust and prominent; 

 inner margin entire. Proceedings Acad. Nat. Sciences, Dec., 1856, p. 313. 



Locality. Santa Barbara and shores of San Pablo bay ? California. Dr. Newberry. 



DOSINIA, Scopoti. 



1. Dosinia longula. Eegularly ventricose, inequilateral, longitudinally oval ; margins and 

 base regularly rounded ; summit prominent ; buccal margin more obtusely rounded than the 

 anal. Proceedings Acad. Nat. Sciences, Dec., 1856, p. 315. 



Locality. Monterey, Cal. Dr. Newberry. 



2. Dosinia alta, PL III, figs. I3a and 136. Obtusely subovate or suboval from beak to base ; 

 posterior margin curved, profoundly oblique ; base regularly and rather acutely rounded ; 

 summits prominent, oblique ; surface marked with numerous fine, concentric, impressed lines ; 

 beaks medial. Height, 4 inches. Proceedings Acad. Nat. Sciences, Dec., 1856, p. 315. 



Locality. Monterey, Cal. Dr. Newberry. 



PECTEN, Lin. 



Pecten Pabloensis, PL III, fig. 14. Orbicular, compressed, thin, concentrically wrinkled ; 

 ribs 18-20, slender ; little prominent, with an intermediate radiating line. 

 Locality. San Pablo bay, Cal. Dr. Newberry. 



PALLIUM, Klein. 



P. esirellanum, PL III, fig. 15. Suborbicular ; lower valve ventricose, slightly undulated ; 

 ribs Vl, broad, little prominent, convex, with an intermediate linear rib, from which the larger 

 ribs are separated by an impressed line; upper valve convex, somewhat undulated, ribs flattened, 

 and the intermediate small ribs with a longitudinal impressed line on the lower part of the 

 valve. Proceedings Acad. Nat. Sciences, Dec., 1856, p. 313. 



Locality. Estrella valley, Cal. Dr. Newberry. 



JANIRA, Shum. 



Janira bella, PL III, fig. 16. Subtriangular ; inferior valve convex, ribs 14 or 15, square, 

 about as wide as the intervening spaces, very prominent, some of them with one or two longi 

 tudinal obsolete lines ; disk finely wrinkled concentrically ; upper valve flattened, deeply 



