GASTEROPODA OF THE LOWER GREEN MARLS. 109 
On one of the casts referred to this species there is a slight but very 
well defined ridge near the base of the volution similar to what would be 
left on a cast of Pseudoliva by the groove representing the notch near the 
base of the lip. Whether it has been produced by accident, or is an organic 
feature of the specimen, I can not say; none of the others which I have 
considered as of the same species show any indication of such a feature, 
and I have been led to consider it as accidental. 
Formation and locality: In the Lower Green Marls at Crosswicks and 
Mullica Hill, New Jersey. Collection Acad. Nat. Sci., Phila., and elsewhere. 
ROSTELLARIA SPIRATA, 0. Sp. 
Plate xi, Figs. 16, 17. 
Shell small, slender, spire elevated with moderately convex whorls, 
divided by very distinct sutures in the casts; apical angle 25° or more; 
volutions six or seven, the last one forming rather less than half of the 
entire length, exclusive of the anterior prolongation; aperture oblique, 
elliptical in outline, nearly or quite equally convex on the inner and outer 
sides; columellar cavity small, straight, and smooth; last volution deflected 
upward very slightly as it approaches the aperture; surface of the ‘ast. 
smooth, without visible evidence of vertical folds. 
The casts of this species differ from those of R. compacta, in being 
more slender, of smaller dimensions, composed of a greater number of 
volutions which are more convex, with larger or broader sutures, and in 
having a shorter and abruptly contracted body whorl. The rostral beaks 
are all imperfect, but they bear evidence of having had considerable length. 
Formation and locality: In the Lower Marl Beds near New Egypt, at 
Crosswicks, and at Upper Freehold, New Jersey. Collections Acad. Nat. 
Sei, Phila., and Rutgers College; also from the same position at Mullica 
Hill, New Jersey, in the collection at Columbia College, New York City. 
ROSTELLARIA CURTA, 0. Sp. 
Plate xi, Figs. 9-13. 
Shell small and comparatively short for a species of the genus; spire 
short, the apical angle being about 45° in some specimens, and in other 
