134 CONTRIBUTIONS TO CANADIAN PALAEONTOLOGY. 



they may be slightly twisted. Septal carinae often present. Tabulae 

 poorly developed, confined to a narrow central area, generally somewhat 

 irregular. Dissepiments numerous, forming a broad vesicular zone sur- 

 rounding the tabulae. Fossette sometimes present. 



Type species. — C. dianthus, Goldfuss. 



Range. — Silurian, Devonian and Carboniferous. 



Cyathophyllum Anticostiense, Billings. 

 Plate X., figs. 5, 6, 6a, 7 and 8. 



Cyathophyllum Anticostiense, Billings. 1862. Palaeoz. Foss., vol. I., p. 109. 

 Cyathophyllum solitarium, Billings. If 66. Cat. Sil. Foss. of Anticosti, p. 93. 

 Cyathophyllum Anticostiense, Lambe. 1899. Ottawa Naturalist, vol. XII., p. 237. 



"Corallum simple, of moderate size, cylindro-turbinate, straight or very 

 slightly curved, broadest near the upper end, attaining a length of about 

 18 cent, with a maximum diameter of over 6*5 cent. Epitheca very thin, 

 preserved only in small patches, showing indications of the structure 

 beneath. Calyx rather shallow, its sides expanding outward in a gentle 

 convex curve. Internally there is a narrow tabulate zone, about one-fifth 

 or one-fourth the diameter of the corallite, with a broad combined vesicu- 

 lar and septate zone surrounding it. Tabulae thin, numerous, inosculating, 

 in some coralla bent down at the margin, eight or ten occurring in a space 

 of 5 mm. Septa straight, numbering from about one hundred to one 

 hundred and twenty, of two definite lengths alternating with each other, 

 one half reaching the centre of the visceral chamber, the remainder stop- 

 ping short of the tabulae, becoming weak and subordinate to the dissepi- 

 ments near the periphery. Dissepiments strongly developed, small, 

 numerous, curving upward and outward between the septa, appearing in 

 radial sections of the corallites as slightly convex plates enclosing narrow 

 and comparatively long spaces. In tangential sections near the surface 

 the dissepiments are seen to be angular midway between the septa, both 

 halves of a dissepiment curving downward toward each other convexly. 

 The dissepiments on either side of a septum generally correspond, so that 

 at the surface with the scant development of the septa in that part, they 

 appear as close-set horizontal wavy lines simulating the structure of 

 Chonophyllum more particularly that of C. magnificum, Billings." 

 (Lambe, 1899.) 



Localities. — South-west Point, Anticosti, division IV. of the Anticosti 

 group, four specimens collected by J. Richardson in 1856. Also from 

 half a mile north-west of Portage Bay, Lake Manitou, Grand Manitoulin 

 Island, Lake Huron, R. Bell and H. G. Vennor, 1865 (type of C. solitar- 

 ium) ; Clinton and Niagara formations. 



