MO'LIvUSCA. 551 



Remarks. — The specimens in the recent collections which have 

 been identified with this species do not agree with the original 

 description and illustration of the species as well as might be 

 desired. They are usually larger shells with less elevated beaks 

 and less markedly truncate posteriorly. All the specimens ob- 

 served, however, are more or less imperfectly preserved. 



Formation and locality. — Merchantville clay-marl, near James- 

 burg (139, 140, 141), Lenola (163), Merchantville (162); 

 Woodbury clay, near Matawan (103), Haddonfield (183). 



Geographic distribution. — New Jersey. 



Eriphyla decemnarla (Conrad). 

 Plate LX., Fig. 9. 



1869. Gouldia decemnaria Con., Am. Jour. Conch., vol. 5, p. 48, 



pi. 9, fig. 4. 

 1886. Gouldia decemnaria Whitf., Pal. N. J., vol. i (Monog. 



U. S. G. S., vol. 9), p. 124, pi. 18, fig. 4. 

 1905. Briphyla decemnaria Johns., Proc. Acad. Nat. Sci. Phil. 



(1905), p. 14. ■ 



Description. — "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 in- 

 ternal characters unknown." (Whitfield.) 



Remarks. — This species has not been met with in the recent 

 collectiohs of the Survey, and is known only from the type speci- 

 men, a little shell scarcely 2 mm. in height. 



Formation and locality. — Woodbury clay, Haddonfield (183). 



Geographic distribution. — New Jersey. 



Eriphyla declivrs (Conrad). 

 Plate LX.. Fig. 10. 

 1869. Gouldia declivis Con., Am. Jour. Conch., vol. 5, p. 48, pi. 

 9, %• 5- 



