294 Organic Remains of the Ferruginous Sand Formation. 
A. tellinoides. (S. G. M.) Pl. V, fig. 11. Irregular, but most 
ly subovate, with concentric undulations. Both these species are 
common in New Jersey; the latter resembles 4. ephippium, to 
which it is referred in the first part of this Synopsis. 
veniuia.* (S. G. M.) 
Pa Conradi. Pi. VIII, fig. 1,2. Trigonal, ventricose, concentrical- 
ly sulcated ; beaks long and bapirnect diameter an inch and a half. 
_ This esas marine shell, so different from any of the hitherto 
known genera, was discovered in New Jersey by my estimable friend 
Mr. T. A. Conrad, under whose name I gladly introduce it to notice. 
ECHINIDE. 
SPATANGUS. 
“s. parastatus. Gs % ee Same as No. 1, of this Synopsis. "See 
vol. xviii, Pl. 3, fig. 
CIDARIS. 
C. diatretum. (S. G. M.) A compressed species, found with the 
preceding, in the caleareous beds of New Jersey. 
NUCLEOLITES. 
No 7 (S. G. M.) Referred in the former part of this 
Synopsis to the genus Ananchytes, and figured, vol. xviii, Pl. 3, ig. * 
CLYPEASTER. 
CC. t feral (S. G. M.) Noticed generically in the first part of 
is. 
ve convex ; each of the five ambulacra composed of two pairs. 
of finely dotted lines: base subelliptical, concave; margin abrupt. 
From the blue marl of Delaware. 2 
To be continued. 
° 
——. 
a : 
* Generic description. An equivalve bivalve; hinge with three robust cardial 
teeth in each Mah and an elongated, thick lateral tooth on the posterior side, simi- 
lar to that of Unio : anterior muscular impression profound. 
