1899] Lam HE — Canadian Pal/EOzoic Corals. 239 



along this line of contact. Surface of coralHtes irregularly 

 ribbed transversely, with fine growth lines between, and longi- 

 tudinally striated by shallow septal grooves. Corallites varying 

 in size in the same individual and in different specimens, from 

 about 8 to 12 mm. in the majority of specimens, and from 10 to 

 17 mm. in the largest specimen. Calyces polygonal in outline, 

 their confluent margins prominently angular, depth about one- 

 half the width, sides steep, bottom narrowly concave, septate to 

 the centre. Septa of two lengths, from about forty-eight to fifty- 

 six in number in different specimens, of which the longer meet at 

 the centre of the visceral chamber and the remainder reach more 

 than halfway and often nearly to the centre, their sides not orna- 

 mented with arched carinae. Tabulae flat, close set, four or five in 

 a length ot i mm., moderately regular, their continuity in a hori- 

 zontal plane often interrupted by the passage of the septa 

 through them, narrow, forming a small but well defined central 

 area from about one-fifth to one-third the diameter of the coral- 

 lite in width. Vesicular zone surrounding the tabulate area, 

 broad, made up of small vesicles of rather equal size, in eight or 

 nine obliquely ascending rows, filling the interseptal loculi. In- 

 crease apparently by interstitial gemmation. 



This species differs from C. quadrigeminum, Goldfuss, prin- 

 cipally in having a much narrower tabulate area and a resultant 

 broader vesicular zone, in having the two orders of septa more 

 nearly of a size and in the absence of septal carinae. 



Locality and formation. — Dawson Bay, Lake Winnipegosis, 

 J. W. Spencer, 1874 ; Lake Manitoba, on east side of Narrows, 

 J. B. Tyrrell, 1888 ; and Lake Winnipegosis at Snake Island and 

 in Dawson Bay also at Lower Salt Spring, Red Deer River, 

 J. B, Tyrrell and D. B Dowling. 1889 ; Devonian formation. 



Cyathophyllum Dawson I, sp. nov. 



Zaphrentis Minas, pars, Dawson, 1868. Acadian Geology, second 

 edition, p. 286 (longest specimen). 



Corallum simple, elongate, slightly curved, in the type 

 specimen broadest at mid-length, contracted near the top. 



