MOLLUSCA. 517 



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

 burg (141) ; Woodbury clay, Lorillard (102) ; Wenonah sand, 

 near Marlboro (130). 



Geographic distribution. New Jersey. 



Anatina clifwoodensis n. sp. 

 Plate LVIL. Figs. 5-6. 



Description. Shell small, the dimensions of the type speci- 

 men being: length, about 18 mm.; height, 12 mm.; thickness, 

 6 mm. Shell subovate in outline, apparently a little gaping pos- 

 teriorly, much broader in front than behind. Beaks compressed, 

 directed backward, fissured transversely, situated about seven- 

 ninths of the length of the shell from the anterior extremity, 

 antero-cardinal margin straight and nearly horizontal in front 

 of the beaks, curving downward in front into the broadly rounded 

 anterior margin; basal margin gently convex curving upward 

 more strongly at each end; posterior margin shorter and prob- 

 ably more sharply rounded than the anterior. Valves depressed- 

 convex, more prominent in the umbonal region, abruptly com- 

 pressed towards the postero-cardinal extremity, the anterior and 

 ventral slopes greatly convex. Shell marked by rather fine con- 

 centric lines of growth. 



Remarks. This species resembles the one described in this re- 

 port as Anatina jerseyensis, but may be distinguished by reason 

 of its smaller size more elongate form, and by the much more 

 posterior position of the beaks. 



Formation and locality. Cliffwood clay, Cliffwood Point 

 (185). 



Geographic distribution. New Jersey. 



Anatina jamesburgensis n. sp. 

 Plate LVIL, Fig. 7. 



Description. The type specimen is only the dorsal portion of 

 a shell preserved as a mould of the exterior, and the ventral out- 

 line can be determined only by restoration from the direction of 



