MOLLUSCA. 519 



1905. Cercomya peculiaris Johns., Proc. Acad. Nat. Sci. Phil. 

 (1905), P- 13- 



Description. — The dimensions of the type specimen are : 

 length, approximately 50 mm. ; height, 29 mm. Shell sub- 

 trapezoidal in outline; beaks considerably in front of the middle 

 of the shell. Anterior margin obliquely truncate above, sloping 

 abruptly downward from the beak, sharply rounded below into 

 the basal margin; basal mai-gin gently convex; posterior mar- 

 gin probably broadly rounded; post-cardinal margin concave 

 just back of the beak, probably becoming straighter posteriorly. 

 Valves moderately convex. Surface marked by strong, con- 

 centric wrinkles of growth. 



Remarks. — This species is known from the single type speci- 

 men which is a mere fragment showing only the anterior por-. 

 tion of a left valve, and probably represaits less than one-half 

 of the entire valve. The outline of the posterior portion of the 

 valve can only be judged by the direction of the concentric lines 

 of growth upon the umbonal portion of the type specimen. The 

 specimen was originally described by Conrad as an Ifwceramws 

 as follows.: "Subequilateral ; ? convex, posterior margin recti- 

 linear, very oblique, extremely angular; ribs prominent, con- 

 centric." The so-called posterior margin in this description is 

 without doubt in reality the anterior margin, and is so considered 

 in the description given above. 



Formation and locality. — ? Woodbury clay, Crosswicks (Con- 

 rad). 



Geographic distribution. — New Jersey. 



Genus Anatimya Conrad. 

 Anatimya anteradiata Conrad. 

 Plate LVIL, Fig. 12. ' 

 i860. Anatimya anteradiata Con., Jour. Acad. Nat. Sci. Phil., 



2nd ser., vol. 4, p. 276, pi. 46, fig. 3. 

 1861. Pholadomya anteradiata Gabb, Synop. Moll. Cret. Form., 



p. 220 (164). 

 1864. Anatimya anteradiata Meek, Check List Inv. Foss. N. 

 A., Cret. and Jur., p. 14. 



