236 PALEONTOLOGY OF NEW JEKSBT. 



ber, somewhat flattened on the periphery and rapidly sloping on the upper 

 surface, ornamented by fine spiral lines and on the q,ngle by a series of 

 transverse nodes, and by a second line of inferior nodes below. The body 

 volution increases much more rapidly in diameter than do those above, and 

 is rounded and ventricose ; presenting a scarcely perceptible angulation at 

 the point of greatest diameter, but with a single stronger raised line in place 

 of the angle, with sharply elevated, rounded, and apparently perforated 

 nodes, representing the upper line of nodes of the spire, and gradually 

 increasing in distance with the. growth of the shell. Aperture rather large, 

 subcircular, contracted below into a narrow canal. Columella slender, 

 straight, and smooth. Surface marked by fine, raised spiral lines which are 

 even, rounded, and contiguous, except on the lower side of the volution and 

 beak, where they slightly alternate in size. 



This species is peculiar for the large size of the body whorl in pro- 

 portion to the diameter of the whorls of the spire, presenting thereby a 

 peculiar wheel-like character midway between the extremities of the spire 

 and anterior beak. The species is quite an abundant one in the Shark River 

 marls, being represented in the collection by individuals of all sizes up to 

 that of the figured specimen, and showing the nodes in all degrees of devel- 

 opment, only the larger ones showing them to have been perforated. 



Formation and locality: In the upper layers of the Upper Green Marls, 

 at Shark River, New Jersey. Collections at Rutgers College. 



Subclass OPISTHOBRANCHIATA. 



TECTIBR AN CHI ATA. 



TORNATELLIDiE. 



Genus ACT^ONEMA Conrad. 

 Am. Jour. Conch., vol. 1, p. 147 = Ccdatura Con.; ibid., pp. 28 and 35. 



There seems to have been at different times when dealing with it 

 some strange misunderstanding or misconception in Mr. Conrad's mind as 

 to what shell he intended to found this genus upon. In his first reference 



