130 PALEONTOLOGY OF NEW JERSEY. 



Gabb, and may be distinguished from the latter by the flattening of the 

 upper surface of the volutions, generally seen only on the outer ones, the 

 others being rounded on the top, probably from the thickening of the shell 

 on the interior surface, and also by the very much smaller umbilical cav- 

 ity and lower spire. Mr. Conrad^ refers the species to the genus Lunatia, 

 but so far as the casts show I am inclined to consider it as a Gryrodes. 



Formation and locality : Mr. Grabb does not assign any locality to his 

 specimens under the original description, but they would appear to have 

 come from Mullica Hill, New Jersey. The specimens here used are from 

 Upper Freehold, New Jersey, and all are from the Lower Marls. Another 

 individual in the collection Am. Mus. Nat. Hist, is from New Egypt, New 

 Jersey 



Genus LUNATIA Gray. 

 Lunatia Halli. 



Plate XV, Figs. 13-16. 



? Lunatia Halli Galab: Jour. Acad. Nat. Sci., PMla., 3dser., vol. 4, p. 391; Meek, 

 Check List Cret. and Jur. Foss., p. 20; Geol. N. J., Newark, 1868, p. 739. 



Euspira Halli Stoliczka: India Geol. Surv., Pal. Indica, Cret. Fauna South. India, 

 vol. 3, p. 396. 



Shell of moderate size, with an elevated spire composed of about four 

 or four and a half volutions in entire specimen, and much resembling a 

 Paludina in general appearance ; elevation about once and a half as great as 

 the diameter of the last volution, and the last volution when measured on 

 the apertural side forms about three-fourths of the entire height; volutions 

 convex, not inflated, but regularly rounded, with a well marked suture in 

 the casts, the only condition in which they are known from New Jersey, 

 but which does not indicate a flattening at the top in the perfect shell; aper- 

 ture elongate-ovate, acutely rounded below and somewhat sharper above 

 than below, the greatest breadth being below the middle; base of the last 

 volution sharply rounding into the umbilical cavity; umbilical opening in 

 the cast small, not extending above the lowest volution, and showing no 

 evidence of any thickening or callus of any kind; surface unknown. 



' Am. Jour. Conch., vol. 5, p. 45. 



