CRETACEOUS FOSSILS. 155 



GARI, Schum. 



Psammobia, Lam. 

 ? G. tbxta, n. s. 



PI. 22, Fig. 130. 



Shell equivalve, nearly equilateral, subcompressed, about 

 twice as long as wide ; beaks broad, not prominent, a little in 

 advance of tbe middle; anterior extremity narrowest, produced 

 and regularly rounded, sloping below towards the basal margin, 

 posterior extremity subtruncate obliquely backwards; basal mar- 

 gin most prominent posterior to the beaks ; a broad, not well- 

 defined ridge passes from the beaks to the posterior basal angle, 

 behind which the surface is slightly concave. Surface marked 

 by very small radiating and concentric lines, producing a woven 

 appearance. 



The internal surface of the shell being slightly undulated, I 

 have been unable to detect any pallial impression on any of the 

 casts I have seen. 



Figure, natural size. 



Locality: From Division B., in the neighborhood of Martinez; collected by 

 Mr. Mathewson. 



AH of the specimens of this shell that I have seen are embedded in a very hard 

 calcareous sandstone, in which it was impossible to expose the hinge. I have, 

 therefore, referred it doubtfully to the above genus. 



TELLINA, Linn. 



T. LONGA, n. s. 

 PI. 22, Fig. 131. . . 



Shell elongate, slender, compressed; beaks small, sharp, 

 rather prominent, nearly central; anterior cardinal margin 

 sloping, nearly straight; posterior slightly excavated; posterior 

 end rostrate, subbiangular; anterior end rounded; basal margin 



