H. Doc. 129. 9 



DESCRIPTIONS OF FOSSIL SHELLS FROM THE EOCENE AND MIOCENE 

 FORMATIONS OF CALIFORNIA. 



I. EOCENE. 



CARDIUM, Lin. 



1. c. LINTEUM, Conrad, pi. 1, fig. 1. Cordate, ventricose subequi- 

 lateral, with closely arranged radiating lines, umbonal slope subcari- 

 nated ; posterior submargin with closely arranged smooth stride, 

 fine, but much larger than those of the disk. 



Locality. Canada de las Uvas. Allied to C. Nicolleti, Con., but 

 very distinct. 



DOSINIA, Scopoli. 



2. D. ALTA, Con., pi. !_, fig. 2. Elevated equilateral? posterior 

 side short ; disk with fine closely arranged concentric lines, becoming 

 large towards the base ; posterior extremity obtuse, direct. 



Locality. Canada de las Uvas, with the preceding. 



MERETRIX, Lam. CYTHEREA, Lam. 



3. M. UVASANA, Con., pi. l,fig. 3. Suboval convex, inequilateral, 

 margins rounded ; beaks distant from anterior margin ; disk with 

 concentric, rather distant ribs, which were probably laminiforrn when 

 perfect. 



Locality. Canada de las Uvas. 



There is but one broken valve of this species, in hard sandstone 

 and with the ribs broken of. 



4. M. CALIFORNIANA, Con., pi. 1, fig. 4. Subcordate, ventricose, 

 inequilateral ; posterior extremity truncated somewhat obliquely in- 

 wards ; basal margin nearly straight in the middle ; lunule lanceolate ; 

 anterior extremity acutely rounded. 



Locality. Occurs at the Canada de las Uvas, with the preceding 

 species. Allied to M. Poulsoni, Con. 



CRASSATELLA, Lam. 



5. c. UVASANA, Con., -pi. 1, fig. 5. Subtriangular, compressed, 

 concentrically sulcated above, and having a few slight concentric un- 

 dulations inferiorly ; ligament slope very oblique, rectilinear ; ante- 

 rior extremity regularly rounded. 



Locality. Canada de las Uvas, with the preceding species. 



6. c. ALTA, Conrad. This species occurs in the same rock with 

 the preceding, but only in small fragments. It appears to have been 

 abundant, as it likewise is at Claiborne, Alabama. The fracture has 

 resulted from breaking the rock, as the shell appears to have been 

 perfect and not water- worn. 



