GASTEROPODA OF THE LOWER GREEN MARLS, 113 



been somewhat sigmoidal in tlieir direction in joassing 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 MuUica Hill or from near Burlington, 

 New Jersey, 



Anchxjra abrupta ? 



Plate XIV, Figs. 1-3. 



Anchura abrupta Conrad? Jour. Acad. Nat. Sci., Phila., 3d ser., vol. 4, p. 384, 

 PI. XLVii, 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. Acrad. Nat. Sci., Phila., 1876, p. 298, 



MON xvm 8 



