184 PALEONTOLOGY OF NEW JERSEY. 



the spire is 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 

 JR. 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, n. Sp. 



Plate XXIII, 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. 

 xxni, 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 

 b}^ 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- 



