GASTEROPODA OF THE LOWER GREEN MARLS. 151 
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 Green Marls at Haddonfield, New Jersey. Collection of Acad. 
Nat. Sci., Phila. 
PYRAMIDELLID. 
Genus OBELISCUS Humphrey. 
OBELISCUS CONELLUS, n. Sp. 
Plate x1x, Fig. 1. 
Shell minute, the extreme length of the only specimen known being 
only about one-sixth of aninch. 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 effect 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 
form Pyramidella is supposed to extend as low. 
