136 PALEONTOLOGY OF NEW JERSEY. 
or less rounded, and in old individuals sometimes distinctly rounded; casts 
showing a small umbilical perforation, but the axis probably solid in the 
shell; volutions probably seven or eight, but in the casts the upper ones 
are usually absent and seldom show more than four or four and a half; 
one small specimen retaining the upper whorls, to the number of four and 
a half, measures only five-eighths of an inch in diameter. This one, if con- 
tinued below to the size of the larger one figured, would possess at least 
eight volutions; whorls obliquely flattened on their surfaces in the direc- 
tion of the spire, with only a small portion of their edges rounded or ver- 
tical, and the surface deeply and abundantly scarred by the cicatrices of 
foreign substances which have been attached to the surface of the shell 
during life; aperture compressed, transversely ovate or trapezoidal, and the 
outer margin much prolonged 
This seems to be a not uncommon shell at some of the localities of the 
Lower Marls, but is seldom found except in fragments; the upper portion 
nearly always being absent, and the cast often looking as if these parts had 
been filled up or absorbed, rather than that the casts had been mutilated. 
I presume the upper portion of the whorls were in many cases cut off by 
partitions deposited across them, which would give the casts their present 
appearance. 
Formation and locality: In the Lower Green Marls at Upper Freehold; 
in the brown marly layers of the same horizon near Burlington; also at 
Crosswicks Creek and at Mullica Hill, New Jersey. The type of the 
species was from Prairie Bluff, Alabama, from which locality I have seen 
numerous specimens. 
Genus ENDOPTYGMA Gabb. 
ENDOPTYGMA UMBILICATA. 
Plate xvil, Fig. 20. 
Phorus wmbilicatus Tuomey: Proc. Acad. Nat. Sci., Phila., 1855, p. 169. 
Endoptygma wmbilicata (Tuom.) Gabb: Proc, Acad. Nat, Sci., Phila., 1876, p. 302. 
Shell rather below a medium size, spire broadly conical, with an 
apical angle of about 80°, and composed of about four volutions; base 
flat or slightly concave, and in the cast showing a small open umbilical 
