MOLLUSCA. 507 



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

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

 The original of Whitfield'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 /ocai/iifv.— ^Merchantville clay-marl, near James- 

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

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



Geographic distribution. — New Jersey, Texas. 



Modiola wenonah n. sp. 

 Plate LV., Fig. 11. 



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 postero-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. 



Pormaiion and locality. — Wenonah sand, near Marlboro 



(130^)- 



Geographic distribution. — New Jersey. 



Modiola subinflata Whitfield. 

 Plate LV., Figs. 20-21. 

 1886. Modiola {Lithodomus ?) inilata Whitf., Pal. N. J., vol. 

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

 1-2 (preoccupied). 



