eel ied 
CEPHALOPODA OF THE CRETACEOUS MARLS. 271 
situated on the inside of the coil; besides this, there are apparently three 
principal lobes, situated, one on the line of the upper row of nodes, or 
nearly opposite the siphon, and a larger one midway between it and the 
siphon; the one on the upper side of the tube is much larger than that 
below. ‘There have also been secondary lobes between these primary ones. 
The sinuses have been correspondingly large and of unequal size, but owing 
to the wearing of the surface the details of structure can not be made out. 
This species differs very materially from any of those described from 
the west, in the details of structure. It is perhaps more like H. Newtoni, 
Whitf., from the Black Hills of Dakota (see Paleont. of the Black Hills, 
Pl. xv, Figs. 1-4) than any other, but it differs in being sinistrally coiled 
instead of dextrally as that one is. I. B. Meek also figures a species in the 
U.S. Geol. Surv. Terr., vol. 9, PL xxi, Fig. 4, but without name, which 
bears considerable resemblance to this one in surface detail. 
Formation and locality: According to Dr. Morton the type specimen was 
found at Arneytown, New Jersey, by Mr. T. A. Conrad, and would conse- 
quently be from the Lower Green Marls. The second specimen mentioned 
above is to all appearances from the same place; both of these are in the 
Aead. Nat. Sei., Phila. The third example is from the same position at 
Atlantie Highlands, New Jersey, and is in the collection at Columbia 
College. 
Genus SOLENOCERAS Conrad. 
In the Jour. Acad. Nat. Sci., Philadelphia, 2d ser., vol. 4, p. 284, Mr. 
Conrad proposed the above generic name as a division of D’Orbigny’s 
eenus Ptychoceras, using Dr. Morton’s Hamites annulifer as the basis for his 
diagnosis. The shells of D’Orbigny’s genus consist of a slender, tapering 
tube, which, after attaining a certain length, is suddenly and abruptly returned 
upon itself, the two portions being in close contact. Mr. Conrad supposed 
that in the case of Hamites annulifer Morton the outer section, or larger 
section, after having been returned upon the earlier part for a short distance 
had again become deflected away from it at a considerable angle. I am not 
aware that Dr. Morton’s species is positively known by any other than the 
type specimen, which is an internal cast of the outer chambers only, 
although Mr. Conrad cites it as occurring in Alabama as well as in New 
