GASTEROPODA OF THE LOWER GREEN MARLS. Hi 



axis, leaving quite a good sized axial cavity in tlie cast; aperture long and 

 narrow, pointed above and below, tlie upper canal being extended upon the 

 preceding volutions to an unknown extent; volutions marked by numerous, 

 closely arranged, vertical folds, twelve or more to tlie 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 Bostellaria as far as can be judged from the internal cast 

 alone, being destitute of any angulation of the body whorl, without evidence 

 of spiral striae, 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. 



ROSTELLARIA HeBE, n. Sp. 



EFlate 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 rouilded 

 obconical, 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 StromhidcB. 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. 



