118 CONTRIBUTIONS TO CANADIAN PALEONTOLOGY. 



Genus Zaphrentis, Rafinesque and Clifford. 1820. 



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



p. 234. 

 Caninia, Michelin. 1841. Atti della riunione degli Scienziati italiani in Torino. 

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



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

 Epitheca complete. Tabulae 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 genera 1 ly interrupted more or less by the tabula? 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. 



Zaphrentis affinis, Billings. 



Plate VII., figs. 6, 6a, 6b. 



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

 Zaphrentis bcllistria ta, Billings. 18G5. Ibid., p. 430. 



Zaphrentis affinis, Billings. 186G. Cat. Sil. Foss. of Anticosti, pp. 7 and 34. 

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



Corallum simple, conico-cylmdrical, 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, sometimes of maximum breadth at mid length and slightly 

 diminishing in size from there up, annul ated irregularly by accretion 

 ridges varying in prominence and distinctness. Epitheca complete, with 

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

 tinct low rounded ridges corresponding with the interseptal spaces within. 

 Tabuke 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 tabula?, 

 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. 



