180 PALEONTOLOGY OF NEW JEESEY. 



Corbula Foulkei. 



Plate XXIII, Figs. 27-29. 



Corbula Foulkei Lea. Proc. A. N. Sci. Phil., ISGl, p. 149. Pamph., p. 41. Meek, 

 Check-list, p. 15. Geol. Surv. N. J., 1868, p. 727. 



Shell of small size, elliptically triangular in outline, posterior end short- 

 est and acutely pointed; anterior end rounded, the left valve more extreme 

 in form than the right, which is more ventricose and higher than the left. 

 Beaks tumid and incurved, that of the larger valve most distinctly so. Sur- 

 face marked by moderately strong concentric striae and very strong varices 

 of growth. Substance of the shell thick; teeth only moderate in size; 

 muscular markings distinct. 



As I have not been able to find the original specimens described by 

 Mr. Lea, I can only infer from his description that I have rightly identi- 

 fied the form, as he does not figure it The form here described vai-ies some 

 from the somewhat general characters given, but it is the most common 

 form found at Haddonfield, and as both the others recognized at that local- 

 ity have been figured by their author, I think there can be but little doubt 

 of the accuracy of the reference here made. 



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

 Marls at Haddonfield, New Jersey. Collection of the Academy of Natural 

 Sciences of Philadelphia. 



Corbula subcompressa. 



Plate XXIII, Fig. 26. 



Corbula subcompressa Gabb. J. A. N. Sci. Pbil., new ser., Vol. IV, p. 394, PI. LXVIII, 

 Fig. 24. Synopsis, p. 111. Meek, Geol. Siirv. N. J., 18G8, p. 727. 



Shell small, transversely triangular, and nearly equilateral. Left valve 

 moderately convex, most inflated along the umbonal ridge and on the an- 

 terior third; beak small, incurved, appressed; posterior slope moderate and 

 the ridge angular. Surface marked by fine concentric lines. Shell thin. 

 Interior not observed. 



Only a single imperfect left valve has fallen under my observation, and 

 it so mutilated that the hinge features cannot be obtained. 



