702 CRETACEOUS PALEONTOLOGY. 



Formation and locality. Marshalltown marl, near Swedes- 

 boro (177). 



Geographic distribution. New Jersey, Mississippi. 



Turritella jerseyensis n. sp. 

 Plate LXXIX., Figs. 2-3. 



Description. The dimensions of the type specimen, a nearly 

 complete internal cast, are : height, 38 mm. ; maximum diameter, 

 9 mm.; apical angle about 16 ; number of volutions present, 9. 

 In the cast the sides of the shell from the apex to the largest 

 volution are slightly convex, the divergence of the sides de- 

 creasing as the shell increases in length. The suture in the cast 

 is close between the apical volutions, becoming broader and more 

 open as it approaches the aperture; the surface of the volutions 

 is smooth, flattened or slightly convex in the- central portion, 

 and curving more abruptly into 1 the suture. Externally, as shown 

 by a cast from the natural mould, the suture is slightly impressed 

 in a narrow angular groove, the surface of the volutions is flat 

 and marked by about five rather broad, low, revolving ribs, of 

 which the lowest one is the stronger, two faint revolving ribs 

 can also' be detected near the periphery on the lower surface of 

 the last volution. 



Remarks. This species is established upon a nearly complete 

 internal cast, of which one or two of the small apical volutions 

 may be missing, with fragments of the impression of the exterior 

 of the same individual. In its flat volution and slightly im- 

 pressed suture it resembles T. lip pine otti Whitf., from the Nave- 

 sink marl, but it is a smaller shell, with fewer and stronger 

 revolving ribs. The species is more slender than any other mem- 

 ber of the genus in the New Jersey faunas, unless it be T. lippin- 

 cotti, and the reduction of the angle of divergence of the sides 

 is distinctly noticeable in the casts. 



Formation and locality. Cliffwood clay, Cliffwood Point 



(185)- 

 Geographic distribution. New Jersey. 



