GASTBEOPODA OF THE LOWER GREEN MARLS. 117 



greater size, but in the vertical outer face of the volutions, and will be 

 easily identified by this character. 



Formation and locality : In the Lower Marl Bed in Monmouth County, 

 New Jersey, and from the collection at Rutgers College. 



Anchura solitaria, n. sp. 

 Plate XIV, Fig. 9. 



Shell small, but with a comparatively elevated spire, consisting of 

 numerous convex volutions, the number of which can not be determined; 

 aperture expanded into a broad wing-like lip, which is extended on the 

 upper side to just above the base of the next volution and has been strongly 

 recurved on the edge; opposite the middle of the aperture is an extended lip, 

 in the form of a slightly rectirved, spine-like process of greater or less extent, 

 which corresponds in position to a strong, angular keel or ridge, which 

 marks the outer volution at about the middle of its height; also evidence 

 on the cast of a second keel or ridge at a little distance below the first 

 one; body of the volutions marked by numerous, closely arranged, ver- 

 tical folds, faintly seen on the cast; beak rather short. 



This is the only species of the keeled section of this group of shells 

 that I have seen from New Jersey, although it is so abundant in the Cre- 

 taceous of other parts of the country. The cast of this one when deprived 

 of the expansion of the lip would be readily mistaken for that oi A. rostrata 

 Grabb, but the vertical folds are finer, and the lip at once distinguishes it. 



Formation and locality: The only specimen observed is an imperfect 

 cast in a gray marl near the base of the Lower Grreen Marls, and was asso- 

 ciated with specimens of A. rostrata Grabb, collection Acad. Nat. Sci., Phila., 

 marked "Haddonfield, New Jersey." 



Anchura (Drepanochiltjs) compressa, n. sp. 



Plate xiii, Figs. 22-25. 



Shell, as represented by casts, rather above a medium size, with a 

 moderately elevated spire and proportionally large body volution; apical 

 angle somewhat varied as seen on different individuals, one specimen meas- 

 uring only about 30°, and another nearly 45°; volutions five or six (?) in 



