GASTEROPODA OF THE LOWER GREEN MARLS. 109 



On one of the casts referred to this species there is a sUght but very 

 well defined ridge near the base of the volution similar to what would be 

 left on a cast of PseudoUva 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 

 MuUica Hill, New Jersey. Collection Acad. Nat. Sci., Phila., and elsewhere. 



ROSTELLAEIA SPIEATA, n. Sp. 



Plate XIII, 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 cast 

 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. 

 Sci., 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, n. Sp. 



Plate XIII, 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 



