"MBE-] CANADIAN PALAEOZOIC CORALS. 143 



Hal] and Whitfield, Dr. Whiteaves has proposed the name of Gyathophyllum 

 McGonnelli for the former. But the specimens from the Hay and Atha- 

 basca rivers seem to the writer to agree remarkably well with Hall and 

 Whitfield's description of C. ellipticum and with the internal structure of 

 a specimen of C. ellipticum sent by Dr. Griffith, from Rockford, Iowa, 

 the typical locality ; for this reason Dr. Whiteaves's original identifica- 

 tion is retained. 



A variety of this species, from the Upper Devonian rocks of Lake Win- 

 nipegosis, has been recognized by Dr. Whiteaves, who makes the follow- 

 ing descriptive remarks thereon :* " It differs from the types from the 

 Devonian rocks of the Athabasca River only in having its central area 

 occupied by flexuous, irregularly disposed, but for the most part con- 

 tinuous tabulje, rather than by large interseptal dissepiments, and in 

 its narrower vesiculose peripheral zone, the inner margin of which is 

 more clearly defined." 



One specimen from the south-western shore of Cameron Bay, Lake 

 Winnipegosis, J. B. Tyrrell, 1889. 



Gyathophyllum Athabascense, Whiteaves. 



CyathoTphyllum Athabascense, Whiteaves, 1891. Contr. to Can. PalsEon.., vol. I., pt. III., 



p. 202, pi. XXXII., figs. 1, la, 16. 



" Corallum simple, elongate-turbinate and slightly curved ; epitheca 

 well developed, marked with rounded and not very prominent longitudinal 

 ribs, which are much broader than the grooves between them, and by 

 transverse strise or wrinkles and an occasional constriction caused by an 

 arrest of growth. Calyx circular, rather deep, with steep sides ; septa 

 about thirty-four in number, simple, not bearing arched carinse on their 

 sides and apparently not denticulated at their summits. Interior struc- 

 ture, as seen in longitudinal sections, consisting of an outer or peripheral 

 zone of oblique ascending rows of rather large vesicles, and of a broad 

 central area in which the interstices between the septa are crossed by 

 large curved dissepiments, whose size, shape and disposition are very 

 irregular. Transverse sections made a little below the base of the calyx 

 show that the thirty-four septa extend almost to the centre, and that 

 they are all equal in length." (Whiteaves.) 



Locality — Athabasca River, three miles below the Calumet River ; 

 Devonian (Cuboides zone); collector R. G. McConnell, 1890. 



*Contr. to Can. Palason., 1892, vol. I., pt. IV., p. 269, pi. XXXIV., figs. 8, 8a. 



