210 
GEOLOGY OF THE FOURTH DISTRICT. 
the base; surface striated and distantly wrinkled; disk expanded, and sub-reflexed at the 
margin; cup deep in the centre; lamellae denticulated. The vertical lamellae proceed from 
the centre, and there are no transverse laminae as in Cyathophyllum. 
Localities —Moscow ; York ; Seneca lake. 
4. Strombodes distortus, n. s.? — Irregularly cylindrical, contracted and expanded by strong 
concentric rugae ; more or less abruptly curved. The laminae are spirally contorted in speci¬ 
mens which have been examined. 
Localities —York; Moscow; Eighteen-mile creek. 
5. Strombodes? rectus, n. s. — General form turbinate, elongated, gradually expanding 
from the base ; straight; surface marked by longitudinal lines, which indicate the internal 
laminae. 
This is an abundant fossil, sometimes appearing in pairs, but never joined together. It 
usually tapers gradually to a very small point at the base. The cup is very deep, and the 
margins thin, being usually flattened. 
Localities —Moscow; Seneca lake ; York; Eighteen-mile creek. 
* 
6. Strombodes simplex, n. s. — Turbinate, curved near the base ; disk expanded ; thin on 
the edge, sometimes sub-reflexed; laminae simple, much contorted in the centre, and irregu¬ 
larly bifurcating toward the margin, (about 40 in number;) surface marked by longitudinal 
striae. 
The simple prominent laminae, and shallow cup, at once distinguish this species. It re¬ 
sembles the )S. plicatum, which occurs in the Corniferous limestone. 
Locality —Moscow. 
Several other species of these genera occur in the Hamilton group, some of which have 
been figured, as well as many other fossils which will hereafter be published, either at the 
end of the volume or in the report on palaeontology. 
