192 PALEONTOLOGY OF NEW JERSEY. 



convexity between the sutures; below the periphery, which is more or less 

 flattened, or but little convex, the volutions are rapidly and abruptly con- 

 stricted to the moderately slender and somewhat lengthened anterior beak. 

 Aperture large, as wide as high when not compressed, contracted below 

 into a narrow canal, as shown by the casts, and directed upward at the 

 upper angle upon tlie preceeding volution; periphery of the volutions 

 marked by a double row of tubercular or rounded nodes, those on the 

 upper edge largest and most distinct; those below, situated at the point of 

 contraction, being very much smaller and sometimes almost obsolete. On 

 two of the casts there are slight indications of periodic varices at the dis- 

 tance of one-third of the volution apart; these indications are not very 

 marked and may be deceptive. The surface is marked very distinctly by 

 transverse lines of growth, but no indications of spiral lines, ridges, or 

 striae exist upon any of them. 



This is the species which Mr. Conrad referred to Pyriila Smithii; 

 = Miirex Smithii Sowerby ; Mineral Conch., vol. 6, p. 151, PI. dlxxviii. Figs. 

 1, 2; Fig. 3 being also referred to the same species, being a high spired 

 variety. It is scarcely necessary to say that our shell bears very little 

 resemblance to the European one, not even belonging to the same generic 

 group, as far as I can judge from the best examples, one of which is that 

 used by Mr. Conrad, and having his number written on the cast in ink. 

 This specimen (PI. xxiv. Fig. 9) shows it to have had an entirely different 

 anterior beak, and to have been differently constructed throughout as com- 

 pared with P. Smithii Sow., as he figures it, and probably belongs to a dif- 

 ferent section of the Muiicidce. 



Formation and locality: In the upper layers of the Upper Marl Beds at 

 Shark River, New Jersey. Collection at Rutgers College, and Am. Mus. 

 Nat. History. 



TRITONIDJE. 



Genus TRITON Montfort. 



Tkiton eocbnbnsb, n. sp. 



Plate XXIV, Figs. 4, 5. 



Shell, as known from the internal cast, small or below a medium size' 

 spire elevated, with rounded volutions separated by distinct sutures; volu- 



