DEVONIAN ROCKS OF CANADA WEST. 133 



Ebidophtllum steictfm. — (Edwards and Haime). 



Eeidophtli/UM stbiotum. — (Edwards and Haime,) Fohjpiers 



Fossiles, p. 424, pi. 8, fig. 7. 



Corallites elongated, cylindro -turbinate, connected by processes, 

 moderately developed, and at variable distances. G-eramation 

 calicinal ; three or four young springing at tbe same time from the 

 same cup. Diameter of the large corallites four to five lines. 



Of this species we have only a fragment, which appears not to 

 differ from the figure given by the French authors. The gemmation 

 appears to be lateral as well as calycinal, and the corallites are 

 strongly annulated. 



Locality and Formation, — Wear "Woodstock. Corniferous. 



Genus Diphyphyllum. — (Lonsdale-) 



DiPHYPHYLLTJM. — (Lonsdale.) In The Geology of Russia, p.622. 1845. 

 " — (McCoy.) British Palceozaio Fossils, ip.S7. 1851. 



DiPLOPHYLLUM. — (Hall) P alcBontology of New TorJc, Vol. 2., p. 

 115. 1852. 



Generic Characters. -^CoxaShivn. simple, or often forming large 

 masses of long slender cylindrical stems, more or less distant from each 

 other, and sometimes in contact ; internal structure biareal ; no central 

 axis ; the large central area occupied by transverse diaphragms ; outer 

 vesicular area variable in its dimensions, in some species very slightly 

 developed ; radiating septa numerous, rarely extending to the centre. 



Although there has been some difference of opinion among palae- 

 ontologists as to the correct definition of this genus, yet all appear to 

 understand clearly what group of fossils Lonsdale had in view when he 

 published his description, and therefore his name must be retained, 

 even if he were in error when he supposed that the addition of the 

 young corallites was aff'ected by the fission of the parent polyp, 

 Edwards and Haime believed that the genus was founded upon speci- 

 mens of a species of Lithostrotion, in which the columella had not 

 been preserved, while at the same time they thus explain the appearance 

 of dichotomous division so often exhibited by the corallites. The 

 following are their remarks upon D. concinnum : " All the fossils of 

 this species that we have examined were in a bad state of preservation, 

 and the genus Biphypliyllum established for them by Mr. Lonsdale, 

 does not appear to us sufficiently characterised, for it differs from 



VOL. IV. L 



