GASTEROPODA OF THE EOCENE MARLS. 195 



ever of anj folds or ridges. Its angular whorls with the oblique folds dis- 

 tinguish it from any of the species associated with it in the same bed. 

 The cast, when deprived of the principal whorl, or even the aperture and 

 beak, present some resemblances to those of Surcula perobesa herein de- 

 scribed; but the volutions are more angular and the vertical folds more 

 numerous on the upper whorls, while those of the principal one become 

 broken up, and thereby rendered indistinct, while on that one they are more 

 distinct and stronger on the body volution than on those above. The spiral 

 striae are also much stronger and less numerous on the shell. 



Formation and locality: In the upper layers of the Upper Green Marls 

 at Shark River, New Jersey. Collection at Rutgers College. 



FtrSUS PLURICOSTATUS, n. sp. 

 Plate XXIV, Fia:s. 13-14. 



Shell fusiform, rather robust, spire moderately elevated, turreted. Vo- 

 lutions about six in number, ventricose, with strongly marked sutures, 

 subangular above and the body volution obscurely flattened in the middle, 

 giving an obscurely biangular appearance to the body volution, which is 

 augmented by a rapid constriction in the lower part and toward the beak. 

 Aperture large in proportion; beak slender, shorter than the spire, straight 

 and pointed at the extremity in the only example which preserves its out- 

 line entire. Columella destitute of any markings. Surface marked by 

 about nine strong, prominent vertical folds on each volution, which are not 

 aligned one with the other on the several volutions. On the principal volu- 

 tion they become strongly rounded and tuberculiform on the upper part, 

 but are less distinct below or on the flattened part, and are entirely obso- 

 lete on the under surface. The shell is also marked by fine, raised, spiral 

 lines over the entire surface. 



This shell is smaller than F. paucicostata herein described, is proportion- 

 ally more robust and is marked by a greater number of vertical folds ; the 

 body volution differs in the obscure flattening on the middle and in the 

 angularity of the lower part, while the beak is proportionally more slender, 

 straight and pointed. It somewhat resembles F. tortilis Whitf from the 

 Lower Eocene beds on the Alabama River, but is more robust and has more 

 vertical folds, 



