196 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



toward the periphery. As viewed in longitudinal sections, they appear 

 as lenticular cells which radiate obliquely upward and outward from the 

 centre of the coral.'' 



Localities. — Lake Winnipegosis, at various localities ; collected by J. 

 W. Spencer, 1874 : J. B. Tyrrell and D. P>. Dowling, 1889; Devonian 

 (American JStringocephalus zone). Collect- <1 also by R, G. McConnell in 

 ±888 from the Devonian rocks of the Mackenzie River, at the "Ram- 

 parts", and by A. P. Low, on the Moose River, Ont., 1896 (Devonian). 



Genus Cayug/ea. (Gen. nov.) 



Corallum simple, conico-cylindrical. Epitheca complete. A broad, 

 vesicular, peripheral area surrounds a central, axial, tabulate area, the two 

 areas being separated from each other by an inner wall. No septa. 



Type species. — C. venusta, mihi. 



Range. — Devonian (Corniferous formation.) 



Cayugea Whiteavesiana. (Sp. nov.) 



Plate XVIIL, figs. 4, 4a, 46. 



Corallum simple, large, conico-cylindrical. Outer surface strongly 

 ringed by rather regular and sudden constrictions of growth, from about 

 7 to 14 mm. apart. Epitheca, complete with transverse fine growth lines 

 and obscure broken, longitudinal, depressed, linear markings. The only 

 specimen known is about 18 cent, long and represents the upper part of 

 the corallum which, judging from the slow rate of increase in thickness, 

 may have attained a total length of 60 cent, (or roughly 2 feet); diameter 

 of specimen above about 7 cent., below about 6 cent. Longitudinal and 

 transverse sections reveal a central tubular area about 25 mm. in width, 

 filled with numerous tabul?e, and separated from a surrounding peripheral 

 vesicular area by a well defined inner wall. Tabulaa flat or slightly con- 

 cave, generally turned up near the edge, moderately regular in their dis- 

 position. Vesicular area made up of outwardly ascending cystose plates 

 very unequal in size, resting on each other and enclosing spaces from 2 or 

 3 mm. to about 2 cent, in length. Septa absent and only indicated in a 

 feeble way by the longitudinal epithecal markings. The specimen is 

 crushed above, so as to obscure the form of the calyx, and the basal part 

 is broken off. 



Locality and formation. — Cayuga, Ont., collected by J. DeCew ; Cor- 

 niferous limestone. 



