GASTEROPODA OF THE LOWER GREEN MARBLS. G1 
Genus VOLUTOMORPHA Gabb. 
VOLUTOMORPHA CONRADI. 
Plate vi, Fig. 21; Plate vi, Figs. 1-3 and 4, 5?. 
Rostellites Conradi (Gabb) Meek: Check List Cret. and Jur. Foss., p. 21; Geol. 
N. J., Newark, 1868, p. 730. 
Fulguraria Conradi Gabb: Proc. Acad. Nat. Sci., Phila., 1861, p. 364. 
Volutilithes Conradi Gabb: Jour. Acad. Nat. Sci., Phila., vol. 4, p. 300, Pl. XLVIII, 
Fig. 10; Synopsis, p. 93. 
Volutomorpha Conradi Gabb: Proc. Acad. Nat. Sci., Phila., 1876, pp. 290, 293 ; 
Struct. and Syst. Conch., Tryon, vol. 2, p. 166. 
Shell large, some specimens apparently attaining a length of 44 inches, 
with a diameter of the largest volution of rather more than 14 inches; spire 
short, or only moderately elevated, although the general form of the shell 
is somewhat slender, the body volution, as viewed on the the apertural side, 
forms fully four-fifths of the entire length, even in the condition of internal 
casts; upper volutions compact, convex on the sides, and rather squarish or 
suddenly rounded to the suture on the top; body volution very large and 
very gracefully swollen or convex in the upper part, and prolonged and 
attenuated below, forming a long, gracefully tapered anterior beak with the 
columella slightly twisted; top of the volution rather suddenly contracted 
to the suture; aperture large, very elongate-elliptical in outline and pro- 
longed below, where it becomes narrowed as the outer lip approaches the 
axis; columella slightly twisted and marked by from one to three very 
oblique folds, the middle one of which is usually the strongest; surface of 
the casts usually smooth, with the exception of, in some cases only, a few 
distant vertical folds on the upper ones, and on the extreme upper part of 
the body volution; but where the external ‘features are preserved, the 
whole shell is marked by strong, rounded, vertical folds, and but little less 
strongly marked, rounded, spiral ridges; the spiral ridges moderately dis- 
tant on the upper part of the volution, but becoming less strongly marked 
and crowded, and finally almost obsolete, toward the base. 
I have before me a large number of the internal casts of this species, 
mostly imperfect; the original of Mr. Gabb’s figure and description being 
