GASTEROPODA OF THE LOWER GREEN MARLS. a e¢ 
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, 0. 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 recurved, 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 of A. rostrata 
Gabb, 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 Green Marls, and was asso- 
. ciated with specimens of A. rostrata Gabb, collection Acad. Nat. Sei., Phila., 
marked ‘Haddonfield, New Jersey.” 
ANCHURA (DREPANOCHILUS) COMPRESSA, 0. sp. 
Plate xii, 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 
