MOLLUSCA. 767 



pyriform, largest above and angular at the middle of the outer 

 lip corresponding to the angulation of the body whorl ; volutions 

 marked by distant, angular, vertical folds or ridges, seven to 

 nine oi which may be counted on a single volution ; these folds 

 are indicated very strongly on the center of the volution in the 

 cast, but not visible tO' any great extent much above or below; 

 no positive indications of spiral lines have been seen on any of 

 the casts." (Whitfield.) 



Remarks. — A careful examination of the lithologic characters 

 of the type specimen of this species has led to the decision that 

 it is certainly from the Merchantville clay-marl, the formation 

 from which alone the species has been met with in the recent 

 collections of the Survey. The species is closely allied to 0. 

 medians, the similarity being almost too close tO' admit of specific 

 differentiation, the chief difference being the more slender form 

 of 0. slacki. 



Formation and locality. — Merchantville clay-marl, Lenola 

 (163), Merchantville (162), Crosswicks (Gabb). 



Geographic distribution. — New Jersey. 



Genus TurbineIvIvA Lamark. 



Turbinella intermedia n. sp. 



Plate XC, Figs. 18-22. 



Description. — Internal casts short fusiform tO' subglobular 

 in form, with about three volutions, the dimensions of two 

 nearly complete examples being: height, 18 mm. and 13 mm.; 

 greatest diameter, 17 mm. and 11.8 mm. Apical angle about 

 75", the spire about one-third the total height of the shell, the 

 volutions increasing somewhat rapidly in size, subangular on the 

 periphery and marked by rather strong vertical nodes, which 

 become obsolete before reaching the suture above, and also' a 

 short distance below the periphery, about 12 nodes occurring 

 upon the outer volution; the last volution rather rapidly con- 

 tracting below and produced into a short anterior beak ; columel- 

 lar cavity of moderate width, bearing the impressions of three 

 rather faint revolving folds. 



