286 Organic Remains of the Ferruginous 
TELLINA. 
A small, handsome shell, in general appearance not unlike 7’. pu- 
nicea, is found near Arneytown, N. J 
AVICULA. 
Very perfect casts of a small species. 
PECTUNCULUS. 
A few indeterminate casts. 
PINNA. 
~ Casts, in fragments, resembling the P. tetragona of Sowerby, pl. 
313, fig. 1 
TEREDO. Lin. 
T.. antenaute ? (Sowerby.) The teredo is abundant throughout 
the marl region. It is constantly found in the lignite of the Chesa- 
peake and Delaware canal, where trunks of trees are pierced by 
it in every direction. The casts of this fossil are frequently half an 
inch in diameter. Sometimes these casts consist of pyrites. In the 
caleareous marls of New Jersey, the shelly tube of the Teredo is re- 
placed by crystallized carbonate of lime. = 
venus. Lin. 
A cast, about half an inch in diameter, with fifteen or twenty strie 
radiating from the bates to the margin. _ Fhe 1 is probably a Veneri- 
cardia of Lamarc 
ECHINIDE. 
sPATANGUS. Lam. 
1. A species with five deep sulci, and closely allied to the well 
known European chalk fossil $. cor marinum, as figured in Parkin- 
son’s Org. Rem. Vol. III. pl. 3. fig. 11. It is abundant in the calea- 
reous formation of Gloucester county, New Jersey ; the specimens 
are not casts, but on the contrary have their shell or crust replaced by 
carbonate of lime, and are as perfect as the European chalk echini- 
They vary in magnitude from the size of a filbert to an inch and 4 
half in diameter. 
2. Another species much more compressed than the preceding, 
but otherwise resembling it, is common at the Deep Cut of the Ches- 
—_ and Delaware canal. 
