124 . PALEONTOLOGY OF :SEW JEESEY. 



of the left valve and the carinatecl margin of the shell. This would allow 

 the right valve to be smallest and to fit into the left. This arrangement of 

 teeth differs from that of any species of Tellkhra or Pandora which I have 

 been enabled to examine, and would give pretty good grounds for separa- 

 tion from either of those genera The pallial line, so far as I can determine, 

 has been simple. Dr. Stoliczka, in the Pal. Indica, Vol. Ill, pp. 294 and 295, 

 in speaking of this shell, refers it to Crassatella, in which I think he is in 

 error, and likens it to C. radiata, a species which I have not been able to 

 examine While Mr. Gabb (Proc. A. N. Sci., Phil., 1 876, p. 311), considers 

 it generically identical with his genus Anthomja, described in the Pal. Calif., 

 1864, p. 181, and states that the hinges are identical in the two, but that 

 the California shell is twisted, while this species is not, but thinks this of 

 minor importance. 



Formation and locality. — In the micaceous clays below the Lower Marls 

 at Haddonfield, New Jersey, from the collection of the Academy of Nat- 

 ural Sciences of Philadelphia. 



ASTARTID^. 



Genus GOULDIA Ad. 

 Gouldia decemnaria. 

 Plate XVIII, Fig. 4. 

 Gouldia decemnaria Conrad. Am. Jour. Coucb., Vol. V, p. 48, PI. IX, Fig. 4. 



Shell minute, subquadrangular in outline and but slightly convex. 

 Anterior and cardinal margins nearly at right angles with each other, the 

 posterior and cardinal margins being rounded. Surface marked by very 

 prominent, thickened, concentric ribs, parallel to the border of the valve, 

 and separated by smooth, flattened interspaces. Hinge-structure and other 

 internal characters unknown. 



This small shell is scarcely more than a sixteenth of an inch in diameter, 

 and the species is represented, so far as I know, by only a single left valve, 

 imbedded in the clay in which it was found. The entire aspect of the 

 specimen is that of a young Crassatella, and I am much inclined to think 

 it is one, though I cannot demonstrate this opinion without risking the 



