of North America with those of Europe. 365 
S. sulcatus, S. crispus, S. bilobus, S. lynx, Orthis elegantula, 
O. hybrida, Leptena depressa, L. subflava, L. transversalis, 
Hypanthocrinites decorus, Flavosites gothlandica, Porites inter- 
stincta, Catenipora escharoides, Stromatopora concentrica, F'un- 
gia gothlandica, Cornulites serpularius, and Tentaculites or- 
natus.* 
tus. 
The number of Trilobites proves that the family was still flour- 
ishing at thisepoch. Some species are rare and limited to groups 
of small thickness, which they characterize with much exactness ; 
such are the Phacops Hausmanni, Spherexochus mirus and 
m; th 
have observed. The Bellerophon dilatatus which we have 
discovered at Chicago, Illinois, is one of the very characteristic 
shells of the Wenlock period... Among the eight species of 
Terebratula here cited, the most interesting are the 7'. margi- 
: eflera, Wilsoni, reticularis, and aspera. The last two 
leozoie strata. 
Oi 
* We shall have, in another place, an opportunity of giving the reasons for a 
difference of opinion regarding the identity of some of the species here named, 
With those of E i i 
Blumenbachii and C. punctata, are not identical with those cited by the same name 
fiom a lower ition, neither is it certain that either of them ts identical with 
the European species of the same name; we are quite sure that the latter is distinct. 
Speak of others in the succeeding pages.—J. H. . ‘ 
- de Verneuil een more fortunate than ourselves in finding the T. 
4 in any beds below the Oriskany sandstone. : 
e Orthis ybrida of the ieee group and the similar form found in the 
erberg are positively distinct species.—J. H. 
