MOLLUSCA. 737 



Formation and locality. — Cliffwood clay, Cliffwood Point 



<io5). 



Geographic distribution.- — New Jersey. 



Genus Hercorhynchus Conrad. 

 Hercorhynchus jerseyensis n. sp. 



Plate IvXXXV., Figs. 18-22. 



Description. — The dimensions of the type specimen are : 

 lieight, 29 mm.; height of spire, 7 mm.; greatest diameter, 17.5 

 mm.; apical angle about 75°. Shell pyrifo^rm' with four or five 

 volutions, the outer volution produced below into' a rather short, 

 ■curved anterior canal; suture moderately impressed. The 

 volutions of the spire subangular about midway between the 

 sutures, the angulation marked with obscure nodes, both angu- 

 lation and nodes being obsolete on the higher volutions. Body 

 volution with a rather finely nodose revolving ridge or shoulder 

 below the suture, just below which at the line of greatest diam- 

 eter of the volution, is a row of rounded nodes, about 18 in 

 number, with the intervening spaces about equaling in width the 

 nodes themselves, some of the nodes are produced below for a 

 short distance as obscure, rounded ridges; between the sutural 

 ridge or shoulder and the row of nodes, the surface is concave ; 

 below the row of nodes the surface is broadly and regularly 

 convex, becoming concave below as it passes into the anterior 

 canal. Surface ornamented by obscure lines of growth which 

 show a broad but slight sinuosity beneath the suture. Columella 

 with twO' faint revolving folds. 



Re-marks. — The best specimen of this species which has been 

 ■observed consists of a nearly complete internal cast with a par- 

 tial mould of the exterior from which a plaster cast has been 

 taken. Only the larger nodes, those near the aperture, are visible 

 upon the cast. The species is especially characterized by its 

 ■curved anterior canals. The folds of the columella are seen 

 only as impressions in the cast, and are almost too faint to be 

 •detected except when the specimen is held in a certain position. 

 47 PAi. 



