GASTHEROPODA OF THE LOWER GREEN MARLS. ILL 
axis, leaving quite a good sized axial cavity in the cast; aperture long and 
narrow, pointed above and below, the upper canal being extended upon the 
preceding volutions to an unknown extent; volutions marked by numerous, 
closely arranged, vertical folds, twelve or more to the whorl. 
This is the most slender form yet noticed in the New Jersey Cretaceous 
formations, and has been more extended in front than any other. It seems 
to have been a true Rostellaria as far as can be judged from the internal cast 
alone, being destitute of any angulation of the body whorl, without evidence 
of spiral strive, and provided with a long rostral beak and smooth columella. 
Formation and locality: From the blackish layers of the Lower Green 
Marls at Crosswicks Creek, near New Egypt, New Jersey. Collected by 
Dr. N. L. Britton, and is in the Rutgers College collection. 
ROSsTELLARIA HEBE, n. sp. 
EPlate xiv, Figs. 11-13, 14 ?. 
Shell moderately large, with an elongated conical spire and rather short 
body whorl; volution strongly rounded in the cast, number unknown but 
probably seven or more, the last one proportionately larger and more ven- 
tricose than any of the others; base short but somewhat extended near the 
columellar cavity, which is rather large, showing the axis to have been 
strong; upper part of the body volution largest and the lower part rounded 
obeonical, slightly extended below; aperture, as shown by the cast, of but 
moderate size, narrowly elliptical in form, being nearly equally curved on 
the outer and inner sides; the outer side a little the most strongly so; upper 
and basal angles of the aperture acute; the upper one extended upon the 
preceding volution, causing the last volution, as it approaches the aperture, 
to overlap that one somewhat as in many of the Strombide. Columella 
smooth, without folds or ridges of any kind; suture between the coils of 
the cast strong and deep, but separated by only a narrow space, showing 
the shell at this part to have been thin; the surface of the shell has been 
marked by spiral bands of considerable width, but their number is not 
determinable from the specimens at hand; there is, however, evidence of a 
quite strong one near the center of the volutions, and indications of several 
others, especially on the basal portion of the last volutions, but not present- 
ing any angulation as in Anchura. 
