GASTIiiUOPODA OE* THIl LOWfiE GEEBN MARLS. 15 1 



one individual. He also states that the whorls are "slightly truncated at 

 base except the last one." I may misunderstand this expression, but if, as 

 I suppose, he means that the columella is truncated, I think he is wrong, as 

 there is no evidence whatever of such a feature, and I am at a loss to un- 

 derstand how he could determine the form of the base of the volution from 

 any "except the last." 



Formation and locality: From the micaceous clay at the base of the 

 Lower Grreen Marls at Haddonfield, New Jersey/ Collection of Acad. 

 Nat. Sci., Phila. 



PYRAMIDELLID^. 



Genus OBELISCUS Humphrey. 



Obbliscus conelltjs, n. sp. 



Plate XIX, Fig. 1. 



Shell minute, the extreme length of the only specimen known being 

 only about one-sixth of an inch. Apical angle 38° or 40°, giving a sharply 

 conical spire ; volutions five in number, very slightly scaliform, with chan- 

 neled sutures, but with the surface of the volution flattened in the direction 

 of the spire ; apex apparently rounded ; body volution subangular at the 

 line of contact with the lip ; aperture acute-ovate, sharp at the upper mar- 

 gin, and possibly pointed below (the specimen is imperfect at the base) ; 

 columella slender, rounded, slightly prolonged ; marked by a proportionally 

 very strong, tooth-like ridge just below the swell of the volution; outer 

 lip of the aperture sharp; axis imperforate; surface smooth, but not pol- 

 ished on the specimen, though the dullness present may be the efi"ect of 

 solution. 



The very small size of the specimen would indicate that it was imma- 

 ture, which may very likely be the case, still in this genus of shells the 

 generic and often the specific features are present even on very young 

 individuals, so that in the event of larger specimens of this one being found 

 they will be readily recognized. I do not know that the genus has been 

 recognized in the Cretaceous of this country before, although the allied 

 foiTO Pyramidella is supposed to extend as low. 



