GASTEEOPODA PKOM BASE OJ? THE UPPER GREEN MARLS. 187 



been smooth on the exterior surface. It is by far the largest form of this 

 group of shells which I have seen from the American formations, the imper- 

 fect cast measuring 3^ inches long by If in diameter across the body whorl. 

 The beak of the shell is entirely absent, only the internal cast of the shell 

 being present, but it would indicate a shell of unusual dimensions for this 

 group. 



Formation and locality : The cast appears to be from the base of the 

 Upper Grreen Marls, but the specimen is without definite locality. The 

 lithological features would indicate it as coming from that position from 

 near New Egypt, New Jersey. 



TURRITELLID^. 



Genus TURRITELLA Lamarck. 



TURRITELLA PUMILA?. 



Plate XXIII, Figs. 5, 6. 



2'urritella pumila Gabb : Jour. Acad. Nat. Sci., 3d ser., vol. 4, p. 392, PL Lxviii, 

 Fig. 14; Synopsis, p. 91 ; Meek, Check List Cret. and Jur. Foss., p. 19. 



Shell, as seen in casts, of medium size, rather rapidly tapering, the 

 apical angle being about 30°. Volutions nearly round, the outer surface 

 between the sutures being depressed convex to near the lower third, from 

 which point they are more rapidly rounded to the suture; the number of 

 whorls in a specimen which would, if perfect, measure 1 J inches in length, 

 have been about seven. Sutures strongly marked, but the whorls in the 

 cast are close, indicating a thin shell. Surface, as indicated by the casts, 

 marked by several spiral ridges. 



There is much doubt as to the proper identification of this species. 

 The rapid increase in diameter of the volutions, and their rounded form, 

 together with the numerous spiral ridges, would ally it with the Tennessee 

 species, but its much greater size is against it. It is, however, quite distinct 

 from any other species found in New Jersey, and equally so from any 

 other species found in the Cretaceous deposits of the Atlantic coast. 



Formation and locality : The cast figured is from the collection of the 

 Acad. Nat. Sci., Phila., and was found in a tray with others marked "Vin- 

 centown, N. J." 



