correspond. 
At the same locality, I also procured the cast, a Pleurotoma- 
ria, and one of what seems to have been a plate from the stem of 
a crinoid, 
New Haven, June 15th, 1860. 
Note by B. Billings—Mr, Bradley having favored me with 4 
view of his very interesting specimens, I think there can Te 
reference be correct, then we have at least three, if not four 
a 
. antiquatus (Salter,) described from ‘‘a cast in a brown 
sandstone, said to be a bouldered fragment from Georg). (See 
only differences that can be well made out, from the imperle® 
specimens, but they seem to me sufficient to indicate two peor 
Mr. Salter says further, that the lobes of the glabella in Se 
quatus are very obscure, and that the ocular ridge, if any what 
ted, must have been very slight. His specimen was some - 
abraded. In C. minutus the ocular ridge is, for so small » deep 
cles, very strongly defined, and the glabellar furrows are 
