CEPHALOPODA OF THE CRETACEVUUS MARLS. 269 
The fragment preserves only a single septum the details of which are 
given, enlarged to twice natural size in the figure on the plate, this having 
been the lower limit of the septate portion; the next higher septum being 
at the upper end of the fragment. 
The species is peculiar in its rapidly ascending spire; also in having 
the volutions higher than wide, instead of circular, and also in the numerous 
but very distinct vertical folds or ridges. The concave upper side of the 
coil showing the partial imbedding of the preceding volution will also 
serve to distinguish it from other described species 6f this country, they 
generally presenting round volutions while these are quite angular at the 
junction of any two. 
Formation and locality: From the Lower Green Marls, at Neversink 
Hills, New Jersey. Collection at Rutgers College. 
Genus HETEROCERAS D’Orb. 
HETEROCERAS CONRADI. 
Plate xiv, Fig. 9-14. 
Ammonceratites Conradi Morton: Jour. Acad. Nat. Sci., Phila., 1st ser., vol. 8, 
p. 212, Pl. x, Fig. 1; Descrip. New Sp. Organic Rem. Cret. United States, 
1842, p. 8. 
Helicoceras Conradi (Mort.) Gabb: Synopsis, p. 28; Meek, Check List, p. 25. 
Cirroceras Conradi (Mort.) Meek: Geol. Surv. New Jersey, 1868, p. 730. 
A single whorl of a species of Heteroceras, imperfect at both ends, and 
in all probability nearly if not quite the last whorl of the specimen, repre- 
sents the above synonyma. As will be seen by Dr. Morton’s original 
description, he considered it as almost a perfect individual, as he says in 
his remarks: ‘‘The terminal end is nearly complete and almost on a line with 
what appears to have been the mouth of the shell, and the two approach 
within a quarter of an inch of each other.” It is very evident, however, 
when the specimen is examined by the light of present information and 
knowledge of these peculiar shells, that the specimen, which is only 
an internal cast of the non-septate portion, it belongs to a. sinistrally 
coiled spiral shell, where the volutions have not been in contact one with 
the other, as, if they were extended far enough, they would overlap, leay- 
