C^ASTEROPODA FEOM BASE OE THE UPPEE GRBE¥ MAELS. 1S3 



Fig. 27), an Eocene species, but there can be no doubt of the correctness 

 of the generic reference of that species, and the form of the columellar folds 

 and canal of this one are equally satisfactory. I know of no cretaceous 

 shell with which it can be counfounded, as the generic characters are too 

 well pronounced to be mistaken. 



Formation and locality: In the green sands at the base of the Upper 

 Green Marls of New Jersey, at Farmingdale, New Jersey. Collection at 

 Rutgers College. Collected by Dr. Britton in 1884. 



VOLUTID^. 



EOSTELLITES BICONICUS, n. Sp. 



Plate XXIII, Figs. 10, 11. 



Shell moderately elongated, as seen in the conditions of internal casts, 

 the only condition in which it is at present known. Spire elevated, consist- 

 ing of about four or five volutions, the aperture, which is narrow, forming 

 about two-fifths of the length of the entire cast. Volutions moderately 

 convex, largest at or near the upper margin, indicating something of a 

 square, shoulder-like upper surface for the perfect shell; below this angula- 

 tion the upper volutions are slightly convex, and in the casts leaving very 

 deep and strong sutures between the different whorls of the spire. Lower 

 volution distinctly largest above and cone-like in shape, with a short col- 

 umellar projection below; the lower half of the volution being more rapidly 

 tapering than the upper, forms a slight angulation just below the middle. 

 Columella strong and marked by four nearly equidistant oblique folds, the 

 lower one of which is not more than once and a half as far from the base 

 as the distance between each fold. Aperture very narrow, pointed above 

 and below ; surface, as far as can be seen on the internal casts, showing no 

 evidence of longitudinal folds or revolving lines ; but the shell having been 

 quite thick may not have preserved such features on the interior surface. 



This is one of the forms usually found among specimens labeled 

 R. nasutus; but it differs very strongly from that one in the proportional 

 length of the body volution and in the form of the lip side of the aperture. 

 In B. nasutus, as shown on specimens when the external form is preserved, 



