CANADIAN FOSSILS. »3 



ClEIOCRINUS REGIUS. 



Plate V. Figures la-1^. 



(Clbiooeincs BE6IUS, Report Geological Survey of Canada, 1856, page 2'77.) 



Description. — Cup, elongate, conical, gradually expanding from 

 the base until near the top, where it is slightly contracted. The 

 margin supports about forty long, very slender, tentaculated, free 

 rays. At first sight there appear to be ten small basal plates, but 

 upon examination five of these are found to be the first plates of the 

 five raysv^^hich rest immediately upon the upper joint of the column ; 

 the other five are the true basal plates. Four of these latter are 

 pentagonal, and the fifth, M^hich supports the series of inter-radials, 

 is nearly square ; height of each basal plate, one line ; breadth, the 

 same ; the small radial plates v^^hich rest on the column between 

 the basal plates are a little broader than these latter, but not so 

 high ; the column is pentagonal, and the basal plates are placed 

 upon the angles of the upper joint, while the bases of the rays are 

 situated upon the straight edges : there are about two joints of 

 the column to one line, and they are alternately thicker and thinner ; 

 the column near the lower extremity becomes round and suddenly 

 expands into a broad base of attachment. 



The surface of the cup is nearly smooth, slightly marked by 

 obscure, vertical, rounded ridges along the centres of the rays and 

 of their sub-divisions. 



Length of cup, one inch and three-fourths ; breadth near the 

 margin, about one inch ; diameter of column, from two to four lines. 

 Nearly all the large pentagonal columns in the Trenton limestone 

 at the City of Ottawa belong to this species. 



Explanation op Figures. Plate V. 



Figure la. A nearly perfect cup of this species. 



" 16. The base, shewing the small basal plates, with the quadrangular first 



primary radials between them. 

 " Ic, Id, le, and 1/. Fragments of the column. 

 " Ig. The base of the column. 



Locality and formation. — Trenton limestone, City of Ottawa. 



