118 CONTEIBUTIONS TO CANADIAN PALAEONTOLOGY. 



Genus Zapheentis, Rafinesque and Clifford. 1820. 



Zaphrentia, Rafinesque and Clifford. 1820. Ann. des Sci. Phys. de Bruxelles, vol. 5 



p. 234. 

 Cominia, Michelin. 1841. Atti della riunione degli Soienziati italiani in Torino. 

 ? Polydilasma, Hall. 1852. Palaeon. New York, vol. II., p. 112. 



Corallum simple, varying in shape from conical to conico-cylindrical. 

 Epitheca complete. Tabulse extending across the visceral chamber. No 

 interseptal dissepiments as in Cyathophyllum. Septa of two orders, alter- 

 nating, the primaries sometimes reaching the centre and slightly twisted 

 their vertical continuity generally interrupted more or less by the tabulae on 

 whose upper surface they pass toward the centre as sharp keels or cari- 

 nations, secondaries feebly developed. Septal fossette usually conspicuous. 

 No columella. 



Type species. — Z. (Caninia) patula, Mich. 



Range. — Upper Cambro-Silurian, Silurian, Devonian, Carboniferous. 



Zapheentis afmnis, Billings. 



Plate VII., figs. 6, 6a, 66. 



Zaphrentis affinis, Billings. 1865. Canadian Naturalist, new series, vol. II., p. 430. 

 Zaphreniis bcllistriata, Billings. 18C5. Ibid., p. 430. 



Zaphrentis affinis, BiBings. 1866. Cat. Sil. Fois. of Anticosti, pp. 7 and 34. 

 Zaphrentis beUistriata, Billings. 1866. Ibid., pp. 8 and 34. 



Corallum simple, conico-cylindrical, large, attaining a length of about 

 19 cent, with a diameter at the upper end of slightly over 6 cent, some- 

 what curved near the base, moderately straight above, generally broadest 

 at the calyx, sometimfs of maximum breadth at midlength and slii^htly 

 diminishing in size from there up, annulated irregularly by accretion 

 ridges varying in prominence and distinctness. Epitheca complete, with 

 fine transverse, crowded growth lines and marked longitudinally by dis- 

 tinct lo^v rounded ridges corresponding with the interseptal spaces within. 

 Tabulae complete, flat or slightly concave near the centre, turned down at 

 the edges, from 1 to 2 mm. apart or even closer, frequently inosculating. 

 Septa of two orders, primaries and secondaries, alternately long and short, 

 the primaries extending to or almost to the centre of the visceral chamber 

 for the inner part of their length at least as carinations on the tabulae 

 secondaries about one-quarter the length of the primaries ; in a specimen 

 45 mm. in diameter they number about one hundred. Calyx nearly as 

 deep as broad with vertical sides and a broad somewhat convex floor or 

 bottom radially striated by the septa. 



