62 PALEONTOLOGY OF NEW JERSEY. 



FUSID^. 



Genus FUSUS Lam. 



FUSUS ? HOLMDELENSIS, n. Sp. 



Plate VI, Figs. 10, 11. 



Shell of moderate size, about 1^ inches in length; spire short, less than 

 one-third as long as the body volution and beak; volutions four or more, 

 the upper ones rather small and the body volution proportionally large, 

 ventricose in the middle and extended in front in a moderately long, slightly 

 twisted canal; aperture large, more than half the entire length of the shell; 

 the outer lip broadly and strongly sinuate in the upper part and somewhat 

 extended forward below; columella slender, twisted; surface of the volu- 

 tions marked by rather strong, prominent, vertical folds, which are most 

 distinct on the body of the lower whorl, but become obsolete below, and 

 on the upper whorls are extended from suture to suture, ten of these folds 

 being visible on the large volution; strong lines of growth also cross the 

 shell parallel to the border of the aperture; closely arranged, elevated spiral 

 lines cover the entire shell, and are finest and most numerous on the upper 

 part, more distant below the middle, and strongly marked on the anterior 

 beak, where they are very oblique; the spaces between the lines apparently 

 flat. 



This species is apparently a true Fusus, and is the only one I have 

 noticed in the Cretaceous green sands of the State. In the condition of an 

 internal cast it would present somewhat the appearance of a specimen of 

 Volutomorpha bella, but would have a rather shorter spire and ventricose 

 volutions, and might be somewhat difficult to distinguish, but on the speci- 

 men figured, on which the shell substance is largely preserved, there is no 

 evidence of columella plications, which I think would be readily distin- 

 guished had they existed. The surface markings are also different. I 

 know of no other shell in the formation with which it would be readily 

 confounded. 



Formation awl localitij: In the coarse, green marls of the Lower Green 

 Sands at Holmdel, New Jersey. In the collection of Prof. Reiley. 



