MOLLUSCA. 553 



anterior portion of a Trigonia probably T. eufaulensis. No 

 specimens have been found in the recent collections of the Survey 

 which can be referred to the species. 



Formation and locality. Unknown, Monmouth County (Con- 

 rad). 



Geographic distribution. New Jersey. 



Family OBASSATELLITIDAB. 



Genus CRASSATELLITES Kruger. 



Crassatellites subplanus (Conrad). 



Plate LXL, Figs. 1-4. 



1853. Crassatella subplana Con., Jour. Acad. Nat. Sci. Phil., 

 2nd sen, vol. 2, p. 274, pi. 24, fig. 9. 



1860. Crassatella lintea Con., Jour. Acad. Nat. Sci. Phil., 2nd 



ser., vol. 4, p. 279, pi. 46, fig. 5. 



1 86 1. Crassatella lintea Gabb, Synop. Moll. Cret. Form., p. 168 



(112). 



1 86 1. Crassatella subplana Gabb, Synop. Moll. Cret. Form., p. 



169 (113). 

 1864. Crassatella lintea Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. n. 

 1864. Crassatella subplana Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. n. 



1868. Crassatella lintea Con., Cook's Geol. N. J., p. 726. 

 1886. Crassatella subplana Whitf., Pal. N. J., vol. i (Monog*. 



U. S. G. S., vol. 9), p. 121, pi. 18, figs. 14-16. 

 1905. Crassatellites Imteus Johns., Proc. Acad. Nat. Sci. Phil., 



(1905), p. 14. 

 1905. Crassatellites subplanus Johns., Proc. Acad. Nat. Sci. 



Phil. (1905), p. 14. 



Description. The dimensions of a small specimen, a nearly 

 perfect right valve, are : length, 36 mm. ; height, 28 mm. ; con- 

 vexity, 6 mm. Large individuals grow to a length of 50 mm. 

 or more. Shell broadly subovate in outline, beak obtuse, situated 

 about one-third the length of the shell from the anterior extremity. 



