138 ON THE FOSSIL CORALS OF THE 



to one hundred obscure sulci indicating the rudimentary radiating 

 septa. Surface with a very thin epitheca, which is seldom preserved. 

 Interior completely filled with vesicular cells, those near the centre 

 being the largest. These cells are sometimes arranged in funnel- 

 shaped layers, and thus many of the specimens appear to be composed 

 of a series of hollow cones fitting into each other. Length, from three 

 inches to two feet ; diameter, three-fourths of an inch to one inch and 

 a half. 



The long, slender specimens are often very much and irregularly 

 curved. 



Locality and formation. — Abundant in the corniferous limestone in 

 the Townships of Seneca, Cayuga, Oneida, Walpole, Wainfleet, and 

 Humberstone. 



Ctstiphtllttm geandis? — (Billings). 



This species! is very large, turbinate, more or less curved, and 

 enveloped in a thin wrinkled epitheca. Cup deep bell-shaped, either 

 striated with the rudimentary radiating septa, or consisting of an 

 uniform surface of the small depressed convex cellular elevations. 

 The growth appears to have been intermittent, or by the formation 

 of successive layers of cells upon the inner surface of the cup, and 

 consequently in longitudinal sections the substance of the whole 

 mass is seen to be arranged in a series of funnel shaped strata, placed 

 one within another. The separation between the layers is much 

 more distinct in some specimens than in others. 



There are fragments of this species in the collection of the Greolo- 

 gical Survey of Canada, five inches in diameter; and one specimen, 

 still lying in the rock, is known which is three feet long. 



This species has been referred to G. ymcwZo^Mw,, (Groldfuss,) but 

 is a much larger form. I do not feel satisfied that it is distinct from 

 C. Senecaense. In structure it closely resembles that species ; but, 

 on the other hand, the young specimens suddenly expand to a diame- 

 ter of from two to three inches or more, at a length of three or four 

 inches, while the young of the former, of the same length, are not 

 more than one fourth that thickness. It may be that materials can 

 be procured to connect all the forms into one very variable species. 



Locality and Formation. — Lot No, 6, con. 1, "Wainfleet. 



