184 PALEONTOLOGY OF NEW JERSEY. 
the spire 1s quite low in comparison with the entire length of the shell, 
being not more and probably less than one-sixth of the length; while in 
this one it would appear to have formed nearly one-half of the whole length. 
It also pertains to a different geological horizon, as all the authenticated 
specimens show. 
Formation and locality: The specimen figured is from the base of the 
Upper Marls at Squankum, New Jersey, and belongs to the collection at 
Columbia College; several others from the same position geologically are 
from Farmingdale, New Jersey. Other specimens are from the Acad. Nat. 
Sci., Phila., but are without locality, and are associated with specimens of 
R. nasutus. From their lithological features I should refer them to the 
same horizon as the one figured here, viz, base of the Upper Marls, or the 
uppermost bed of the New Jersey Cretaceous. 
VOLUTODERMA INTERMEDIA, 0. sp. 
Plate xxi, Figs. 14, 15. 
Shell of medium size, elongate ovate in outline, with a moderately 
elevated spire and ventricose volutions, the last one of which forms the 
greater bulk of the shell and is most ventricose above the middle. Volu- 
tions three to four in number and rapidly increasing in size. Aperture 
semilunate, oblique, nearly straight on the inner side, forming a little more 
than half of the entire length of the shell as shown in the cast. Columella 
marked by two or three strong, oblique, nearly equidistant plications; 
outer surface of the shell unknown. The inner surface of the volutions 
in one of the casts, which would preserve the markings of the volu- 
tion within it where any existed, is entirely smooth, indicating a smooth 
shell; but another fragment, which appears to belong to the species, has 
the surface closely lirated with markings of numerous vertical folds which 
have formed nodes at the junction of the two sets (see outline figure PI. 
xx, Fig. 15). It also shows three columellar folds, as does the smooth 
one. The last one has been an old shell, much thickened, as indicated 
by the great space between the coils of the cast, while the other which 
bears the markings has been smaller and very much thinner in substance. 
