44 Say on Shells, &c. 
of the opposite valve, slightly more depressed ; two or three 
more conspicuous incremental lines are continued so as to 
cross the projecting face of the siphunculated hinge margin, 
which is but slightly prominent. 
Cabinet of the Acad. Nat. Sciences. 
This handsome species was found in the New-Jersey Al- 
luvium by Mr. 8. Wetherill of Burlingion. ‘The folds are 
somewhat similar to those. of Plicatula plicata. It resem- 
bles the T’. crumena of Sowerby, in the form of its folds, and 
in their extending to the beak, but the middle of the front 
is very slightly elevated, with but two folds, mstead of three 
as in the crumena, the sides also have two or more folds, in- 
stead of four or more, and the beak is not very prominent. 
Belemnites. 
These are often found in the New-Jersey Alluvium, 
sometimes entirely changed into chrystalized blue iron earth, 
(Hydrate of iron, of Judge Cooper.) 
Ammonite. 
A species of this genus was found in the abovementioned 
locality by Mr. Wetherill. It approaches nearest to 7. ele- 
gans of Sowerby, but l have not seen a specimen sufficiently 
entire to determine its species with exactness. 
Dentalhium. 
A species has been found in New-Jersey, near Mulliger 
hill, by Mr. A. Jessup, which seems to approach nearest to 
D. sulcatus, but as it has only about sixteen equal coste it is 
more than probably a new species. 
Turritella. 
A species of this genus was found by the same gentleman 
with the preceding, in plenty. It approaches very closely 
to the 7’. conoidea of Sowerby and is most probaly the same 
species. ! 
I have seen several redintrigrate fossils from the New- 
Jersey Alluvium, amongst which I may mention a Cucullaea, 
