86 PALEONTOLOGY OF NEW JERSEY. 
marked in Volutomorpha. The passage from this latter genus into Voluto- 
derma Gabb is also so gradual as to be confusing. Taking into account the 
above facts, there appears to be only the one reliable feature of the widen- 
ing of the aperture and canal in the lower part of Rostellites, while in the 
Volutodermas the canal, and consequently the volution, is contracted into a 
beak in front. This feature, however, becomes very obscure and confusing 
in such forms as V. ponderosa, herein described. (See also observations 
under the generic descriptions of Péestochilus). 
Genus ROSTELLITES Conrad. 
ROSTELLITES NASUTUS. 
Plate x1, Figs. 1, 2. 
Volutilithes nasuta Gabb: Jour. Acad. Nat. Sci., Phila., 2d ser., vol. 4, p. 300, Pl. 
Lyi, Fig. 9 ; Synopsis, p. 94. 
Rostellites nasuta (Gabb) Meek: Check List Cret. and Jur. Foss., p. 21; Geol. 
N. J., Newark, 1868, p. 730; Gabb, Proc. Acad. Nat. Sci., Phila., 1876, p. 294. 
Fulgoraria nasuta Gabb: Proc. Acad. Nat. Sci., Phila., 1861, p. 364. 
Comp. R. Texana Conrad, Mex. Bound. Sury., vol. 3, p. 128, Pl. xiv, Fig. 2. 
Shell of moderately large size, sometimes attaining a length of nearly 
or quite 5 inches. Form slender, with a proportionally short, turreted 
spire, varying from two-thirds of the length of the body volution in 
the casts to not more than one-third in the shell itself; number of volu- 
tions uncertain, the type specimen having had about four; body volu- 
tion slender, most ventricose near the upper part, marked by numerous 
spiral ridges with broader interspaces which have possibly been marked by 
smaller ridges between the large ones; the upper lines nearly parallel to 
the suture, but below they become more and more oblique, so that the lower 
ones become nearly parallel with the columella; aperture comparatively 
broad and the lip thin; columella marked by three or four very oblique 
folds, situated near the middle of its length; the upper three at equal dis- 
tances from each other and the lower one a little more distant from the 
next above. 
There is considerable difference between the several individuals which 
IT find marked with this name, and they undoubtedly represent two or more 
