Sand Formation of the United States,  @6t 
emy, several other specimens have been found, all precisely similar 
to each other. In England and France this genus is characteristic 
of the ferruginous sand. | 
BELEMNITES. 
1. B. americanus. (S. G. M.) Allied to B. mucronatus of Eu- 
rope. (Vide Blainville, Mem. sur les Belemnites, pl. 1. fig. 12. and 
Sowerby, pl. 600. figs. 1,2,4,6, and 7.) Abundant in the blue marls: 
in many parts of New Jersey. Ihave no question that some hun- 
dreds might be collected in the compass of a few cubic feet. In a 
paper printed i in the Journal of Academy two years since, I referred 
this species to Lamarck’s B. subconicus, chiefly, however, from an un- 
willingness to multiply specific names. The subsequent examination 
of numerous specimens, and the comparison of them with the de- 
scriptions and figures in Blainville, Sowerby, &c. have convinced me 
that the American belemnites require particular scrutiny. I there- 
fore propose to give descriptions and accurate drawings of them, in 
an early number of the American Journal of Science. 
_ 2. B. ambiguus. (S.G. M.) Thisremarkable fossil is common 
in the calcareous beds of Gloucester county, N. J. and has an anal- 
ogue in B. cylindricus, (Blainville,) as figured by that author, pl. 3,. 
fig. 10,10 a. It will be described and figured with the B. amert= 
SIMPLE AND SPIRAL ee ia: 
" DENTALIUM. 
- Casts of a pretty large species are found at Mullica Hill, N. a Jean 
at the Chesapeake and Delaware canal. 
TURRITELLA. 
1. A large species with about five convolutions, is common through 
out this formation. It exists only i in casts. 
2. Casts of a smaller species are frequent at the Deep Cut of the 
Chesapeake and Delaware canal, in a matrix of dark ~~ and mites 
of mica. 
SCALLARIA ? 
This beautiful shell is in perfect preservation excepting the mouth ; 
hence. the difficulty of deciding the genus. It has four vibations, 
with numerous acute, longitudinal coste, which are transversely. stri- 
ated. ‘Length about an inch and a — It is found in the cal- 
Vor. XVII.—No. 2 
