13^ ON THE FOSSIL CORALS OF THE 



marked with tte longitudinal septal strise ; connecting processes from 

 half an inch to one inch and a half distant from each other ; radiating 

 septa about forty-five, and when perfect, extending nearly to the 

 centre ; central area varying from one to three lines in width ; trans- 

 verse diaphragms, thin, flat, two to five in one line. The corallites 

 are usually half an inch or a little more separate, but often they are 

 nearly in contact, and even grow together for a distance of one inch 

 or more. 



According to Edwards and Haime there are, in the specimen fig- 

 ured by them, only twenty-two radiating septa. It must be borne in 

 mind, however, that in corals of this order very frequently many of the 

 septa are totally destroyed during the process of fossilization. It 

 will be seen by referring to their figure 6 a, that twenty-three well- 

 developed septa are represented, and that in seven of the interseptal 

 loculi, remains of the intermediate lamellae are clearly indicated, and 

 the total number must therefore have been originally forty-six. Our 

 specimens agree so nearly with their figures that there can be little 

 doubt of their identity. Some of the corallites exhibit more than 

 forty -five septa, and in fact, in most of the Zoantharia rugosa, the 

 number is variable within certain limits. 



, Locality and Formation.— 'Rdim^Cs farm, near Port Colborne ; lot 

 19, con. 3, Walpole ; and near Woodstock. 



Eeidophtlltjm Simcoense. — (Billings.) 



In this species, the corallites are two or three lines in diameter, 

 and usually straight, in which case they are parallel ; distant from 

 one to three lines, and connected by short, conical, sharp pointed 

 processes, at intervals of once or twice the thickness of the stems. — 

 The surface is annulated, with more or less strongly developed rings, 

 which are generally oblique, and sometimes consist of sharp-edged 

 folds of the epitheca. There are between forty and fifty radiating 

 septa ; transverse diaphragms well developed. 



Some of the colonies have the corallites very crooked, and con- 

 nected at greatly varying distances. Such masses can only be 

 regarded as groups in which the growth was disturbed, not as distinct 

 species. 



Locality and Formation, — Rama's farm; and near the town of 

 Simcoe. 



