GASTEROPODA OF THE LOWER GREEN MARLS. avs 
been somewhat sigmoidal in their direction in passing from above down- 
ward, being directed slightly forward in the lower part. 
Mr. Gabb' cites Chemnitzia distans Conrad, from Tippah County, Missis- 
sippi, as a synomym of this species, but I think wrongfully, as it appears 
to belong to a group of shells entirely different from this one. 
Formation and locality: In the Lower Marls of the Cretaceous of New 
Jersey. No definite locality is given with the specimen, either in Dr. Mor- 
ton’s original description or in the collection Acad. Nat. Sci, Phila., where 
it belongs; but from the lithological character of the specimen, I should be 
inclined to think it came either from Mullica Hill or from near Burlington, 
New Jersey. 
ANCHURA ABRUPTA ? 
Plate xiv, Figs. 1-3. 
Anchura abrupta Conrad? Jour. Acad. Nat. Sci., Phila., 2d ser., vol. 4, p. 284, 
Pl. xtvu, Fig. 1; Gabb, Synopsis, p. 38, Meek; Check List Cret. and Jur, 
Foss., p. 19. 
Among the casts of this group of shells in the collection Acad. Nat, 
Sci., Phila., there are two individuals from the brown sands near Burlington, 
New Jersey, which are larger and have a more rapidly tapering spire than 
A. pennata Morton, and which evidently represent a species distinct from 
that one. Although the general form is much the same as in that species, 
the vertical folds are more oblique, being directed forward in the lower 
part, and the entire volution has been marked by moderately strong spiral 
lines, a feature which does not exist on any of the many casts of that 
species which I have examined. The volutions also seem a little more 
convex and the last one less extended below. On the better preserved cast 
of the two there are two quite prominent spiral ridges on the periphery of 
the last volution which are about one-twelfth of an inch apart, and appear 
to have corresponded to some feature of the lip. The lip has also been 
somewhat extended over the lower part of the preceding volution; but the 
anterior portion is absent on both, so that the length of the anterior beak 
can not be ascertained. 
' Proc. Acad. Nat. Sci., Phila., 1876, p. 298, 
MON XviII——8 
