MOLLUSCA. 507 



tortion of the former, and it is believed that the Lorillard speci- 

 mens much more nearly exhibits the normal form of the shell. 

 The original of Whit-field's figure 7 is not a member of this 

 species, and judging from its lithologic characters it must have 

 come from a much higher horizon, certainly from one of the marl 

 beds and possibly the Manasquan. 



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

 burg (141) ; Woodbury clay, Lorillard (102), Parry's clay pits 

 near Matawan (103), near Haddonfield (165, 183). 



Geographic distribution. New Jersey, Texas. 



Modiola wenonah n. sp. 

 Plate LV., Fig. ii. 



Description. Shell small, the dimensions of the type specimen 

 being: length, 15 mm.; width, 8 mm.; convexity, 3.5 mm. The 

 hinge-line a little more than one-half the length, the beaks nearly 

 anterior, umbo rather prominent with a somewhat broadly 

 rounded umbonal ridge extending to the posten>basal margin. 

 Anterior margin rather broadly rounding into the nearly straight 

 basal margin which is slightly sinuate back of the middle, 

 postero-basal margin rather sharply rounding* into the long, 

 oblique, slightly convex upper portion of the posterior margin 

 which meets the posterior extremity of the hinge-line at an 

 angle of about 125. Surface of the internal cast marked by 

 indistinct concentric lines of growth. 



Remarks. This species is based upon a single individual from 

 the top of the Wenonah sand near Marlboro. It differs from all 

 other members of the genus in the New Jersey Cretaceous faunas, 

 in the conspicuous postero-basal extension of the shell with the 

 long oblique posterior slope above. 



Formation and locality. Wenonah sand, near Marlboro 

 (I30 1 )- 



Geographic distribution. New Jersey. 



Modiola subinflata Whitfield. 

 Plate LV., Figs. 20-21. 



1886. Modiola (Lithodomus ?) inflata Whitf., Pal. N. J., vol. 

 i (Monog. U. S. G. S., vol. 9), p. 197, pi. 26, figs. 

 1-2 (preoccupied). 



