144 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



Cyathophyllum Waskasense, Whiteaves. 



Gyathophyllwm Waskasense, "Whiteaves, 1892. Contr, to Can. Palseon., vol. I., pt. IV., 



p. 264, pi. XXXIV., figa 5, 5a, 6 and 7. 



Cyathophyllum. dianthus, pars. Whiteaves, 1892. Ibid, vol. I., pt. IV., p. 264 (specimen 



from Red Deer River). 



" Corallum simple, or proliferous and consisting of a single corallite 

 from which as many as from four to six lateral and divergent buds pro- 

 ceed, or increasing by calycinal gemmation, the simple forms and those from 

 which lateral buds are produced being conical, rather slender and more or 

 less curved or bent. Epitheca faintly ribbed longitudinally, transversely 

 striated and marked also with a few irregularly disposed constrictions 

 and re-elevations, the results of periodic arrests of growth ; calyx rather 

 deep, flat at the bottom and with nearly vertical sides ; primary septa 

 twenty-four, extending about half-way to the centre and slightly irre- 

 gular : secondary septa equal in number to the primaries, but not reach- 

 ing more than half as far inward. 



" Internal structure, as seen in longitudinal sections, consisting of a very 

 narrow outer zone of vesicular tissue and of a broad inner tabulate area. 

 The vesicles are small and rather regularly disposed, while the tabulse, 

 which are for the most part complete and regular in their disposition, are 

 very close-set, flat in the centre, but bent downward at their outer 

 margins." (Whiteaves.) 



In this species the septa are][denticulated on their free edges and carin- 

 ated on their side faces. 



Localities. — Red Deer River and Dawson Bay, Lake Winnipegosis ; 

 Devonian : collector J. B. Tyrrell, 1889. 



Cyathophyllum petraioides, Whiteaves. 



Cyathophyllum petraioides, Whiteaves, 1892. Contr. to Can. Pateon., vol. I., pt. IV., 

 p. 265, pi. XXXIV., figs. 1, la and 2. 



" Corallum simple, straight or slightly curved, in well preserved speci- 

 mens attached to some foreign body by a small and partially clasping basal 

 expansion, conical and broadly spreading, the entire height being not 

 much greater than the width at the summit. Outer surface marked with 

 faint longitudinal costse, also by fine transverse striae and a few rather 

 course wrinkles at irregular intervals. Calyx circular, oblique in some 

 specimens but not in others, subconical but irregular in shape, usually 

 very deep and in most cases excavated to within an extremely short dis- 

 tance of the base ; septa about forty-five* in number and apparently equal 



* The septa may be said to vary in number from about forty to sixty according 

 to the size of the corallum. 



