936 PALEONTOLOGY OF NEW JERSEY. 
ber, somewhat flattened on the periphery and rapidly sloping on the upper 
surface, ornamented by fine spiral lines and on the angle 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. 
TECTIBRANCHIATA. 
TORNATELLIDZ. 
Genus ACTAKONEMA Conrad. 
Am. Jour. Conch., vol. 1, p. 147 = Celatura 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 
