la', be] CANADIAN PALEOZOIC CORALS. 141 



faint longitudinal septal furrows. The calyx has sloping sides and is 

 moderately deep, its width is equal to about two-thirds the diameter of 

 the coral above and its depth about three-fifths its width. The septa 

 vary in number from about sixty -five to eighty, and are alternately long 

 and short, one half passing to the centre where they are often twisted, 

 the remainder reaching not quite half way. In the calyx the septa have 

 their free edges denticulated and at the bottom their twisted ends form a 

 slightly raised boss in some specimens. The tabulae are very feebly 

 developed, they average about 5 mm. in width, are flat, and seem to be 

 much interfered with by the longer septa. The central confused area of 

 tabula? and twisted septa gives way laterally to a broad vesicular zone, 

 made up of oblique dissepiments, that become more regular in disposition 

 and smaller in size as the outside of the coral is approached. A septal 

 fossette is indicated in two of the specimens. 



Localities. — A number of places on the Red Deer River, Dawson Bay 

 and Lake Winnipegosis, District of Saskatchewan and Province of Man- 

 itoba; Devonian; collectors, D. B. Dowling, 1888, J. B. Tyrrell and E. B. 

 Dowling 1889. 



Cyathophyllum Richardsoni, Meek. (Sp.) 



AuhphyUum? Richardsoni, Meek. 1868. Trans. Chicago Acad, of Sciences, vol. I, 



p. 81, pi. XI, figs. 3, 3a. 

 Cijathophyll urn Richardsoni, Whiteaves. 1801. Contr. to Can. Palaeon., vol. I, pt. Ill, 



p. 200, pi. XXVII, figs. 3 and 4. 



Corallum simple, curved below, becoming cylindrical above and some- 

 times slightly flexuous, marked generally by strong accretion ridges, 

 especially near the base, on the side of the convex curve ; from 4 to 8 

 cent, in length and averaging about 2 cent, in maximum diameter. 

 Epitheca, when well preserved, seen to be marked transversely by fine 

 wavy lines of growth, about ten in the space of 1 mm., and longitudinally 

 by well-defined septal strife. Calyx of moderate size and varying some- 

 what in depth, sometimes as deep as wide, but generally much more 

 shallow, and showing a considerable variation in the form of the bottom. 

 Septa about seventy-two in number, generally thickened for a short dis- 

 tance inward from their outer ends, thirty-six of them extending to the 

 centre of the visceral chamber, the others half way, more often much less 

 than half way, to the centre. Denticuiations present on the free edges of 

 the septa in the cup and continued over their sides obliquely downward 

 and outward as carina*. Tabula? small, irregular, vesicular, having more 

 the form of large flat dissepiments than true tabula?. Vesicles occupy- 

 ing the interseptal loculi between the ill-defined central area and the 

 outer wall, small, formed by curved dissepiments ascending in rows 

 obliquely outward. 



