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 Gyrodes. 
Formation and locality: Mr. Gabb 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. 
2? Lunatia Halli Gabb: Jour. Acad. Nat. Sci., Phila., 2d ser., vol. 4, p. 391; Meek, 
Check List Cret. and Jur. Foss., p. 20; Geol. N. J., Newark, 1868, p. 729. 
Euspira Halli Stoliczka: India Geol. Sury., Pal. Indica, Cret. Fauna South. India, 
vol. 2, p. 296. 
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., yol. 5, p. 45, 
