130 



ON THE FOSSIL CORALS OF THE 



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Fig. 25. — Blothrophyllum decorticatum. 



(One-balf of a side view of a fragment. The left hand end of the figure shews 

 the condition in which the specimens usually occur.) 



Blotheophtllitm: decoeticatum. — (Billings.) 



Adult specimens two feet iu length and three inchea in diameter 

 dimensions of the immature individuals variable, usually slender and 

 irregularly curved, outer area consisting of rather strong rudimentary 

 transverse diaphragms, curving upwards and outwards, distant from 

 two to eight lines, bearing upoa their upper surfaces imperfect 

 radiating septa, which do not extend from one diaphragm to another. 

 These septa are half a line distant at the margin of a specimen three 

 inches in diameter. When the epitheca is preserved, the surface of 

 this species is marked by numerous deep annulations and sharp 

 encircling folds, their edges being always on the upper side. The 

 transverse diaphragms in the central area are nearly flat, but have a 

 strong septal fossette upon one side. 



In the Corniferous limestone of Canada West, very numerous 

 silicified specimens of this species occur with the outer wall totally 

 removed, leaving nothing but the core of the central area with the 

 partly destroyed curved rudimentary diaphragms attached, presenting 

 an appearance of exfoliation exhibited by no other species in that 

 formation. 



Locality and Formation. — Abundant in the Corniferous limestone 

 at nearly all the localities in the County of Haldimand. 



Genus Ebidophtlltjm: (Edwards and Haime.) 



Ebidophylltjm.— (Milne Edwards and J. Haime.) British Fossil 

 Corals. Introduction, p. 71, and mPolypiers Fossils, p. 423. 



The genus Fridophyllum of Edwards and Haime differs from 

 Diphypliyllum only in having the stems connected by lateral processea 



