120 CONTRIBUTIONS TO CANADIAN PALiEONTOLOGY. 



nearly three lines apart at the margin. Between these are thirty-six smaller 

 ones, which are scarcely half a line in height, and have their edges ser- 

 rated with small denticulations about three in one line. There is a deep 

 septal fossette on one side. Surface and lower parts unknown." (Billings.) 



Locality. — Cormorant Point, Anticosti, division III of the Anticosti 

 group (Silurian), collected by J. Richardson, 1856. 



Zaphrentis Stokesi, Milne-Edwards and Haime. 



Plate IX., figs. 1, la and 2. 



Zaphrentis Stokesi, Milne-Edwards and Haime. 1851. Polyp. Foss. des Terr. Palaeoz., 



p. 330, pi. 3, fig. 9. 

 ? Caninia bilateralis. Hall. 1852. PaliEon. New York, vol. II., p. 41, pi. 17, fig. 3, and 



p. 113, pi. 32, fig. 3. 

 ? Polydilasma turUnatwm, Hall. 1852. Ibid, p. 112, pi. 32, fig. 2. 

 Zaphrentis Stokesi, Billings. 1866. Cat. Sil. Foss. of Anticosti, p. 34. 

 II M Niciholson. 1875. Palaeon. of Ont., pp. 43 and 58. 



Zaphrentis Stokesii, Kominger. 1876. Geol. Sur. Mich., Foss. Corals, p. 144, pi, LI., 

 three figures in lower row. 



Original description. — " Polypier allong^, sans bourrelets d'accroisse- 

 ment, courb^, l^gferement comprim^ dans le sens oppose a la courbure. 

 Calice subelliptique, mediocrement profond. Fossette septale situ^e du 

 c6t^ de la grande courbure. Soixante-quatre cloisons principales, 

 subegales, assez minces, tres-l^gferement epaissies a la muraille oii Ton dis- 

 tingue quelquefois les deux feuillets qui les forment, alternant avec un 

 ^gal nombre de cloisons rudimentaires et se continuant suivant une direc- 

 tion un peu flexueuse jusqu'au centre du plancher superieur, lequel est un 

 peu relev^. Hauteur du polypier, 8 centimetres ; largeur du calice 4, sa 

 profondeur pres de 2. 



" Silurien. Drummond Island (Lac Huron).'' 



Rominger gives a fuller description from specimens from the Niagara 

 of Point Detour, Drummond Island and mentions the occurrence of the 

 species at Masonville, Iowa in the same formation. 



Three simple corals from the upper beds of the Anticosti group in 

 Anticosti were referred to this species by Mr. Billings as early as 1866. 



In 1893 Mr. A. E. Barlow of the Geological Survey obtained, from the 

 exposure of Niagara rocks at the north end of Lake Temiscaming, a good 

 series of a simple coral that is thought to belong to this species. 



The Lake Temiscaming specimens may be characterized as follows. — 

 Corallum simple, elongate, conical, slightly curved, sometimes annulated 

 by low growth ridges, ranging in length as measured on the convex curve 

 in mature individuals from about 60 to 100 mm. with a diameter at the 



