113 



OCELENTERATA. 



ANTHOZOA. 

 Steeptelasma rusticum, Billings. (Sp.) 



Streptelasma corniculum, Tidw. & Ustime. .ISol. Mon. Polyp. Foss. Terr. Palajoz., 



p. 398, pi. 7, figs. 4, 4 a, and 4 h. But 

 probably not S. cornictdum. Hall. 



Petraia rii-ttica, Billings 1858. Rep. Progr. Geol. Siirv. Canada 



for 1857, p. 168. 



Streptdaama cornicidum, Nicholson 1875. Rep. Pal. Pro v. Ont., p. 26. 



" " Roniinger 1876. Geol. Surv. Mich., Palseont., Foss. 



Cor. p. 151 (pars). The specimens from 

 the Hudson River formation only. 



Lower beds, Dr. R. W. Ells, 1875, and T. C. Weston, 1884 : several 

 specimens of a small coral, which appears to be a broad, short form of 

 this species. Upper beds, T. C. Weston, 1884 : apparently not so 

 common. 



Steeptelasma eusticum, var. trilobatum. (Var. no v.) 



Corallum resembling that of the preceding species, but still broader at 

 the summit and longitudinally trilobate, the lobes being broad and 

 rounded, and the furrows between them comparatively narrow and not 

 very deep. 



Lower beds, T. C. Weston, 1884 : twelve good specimens. Upper 

 beds, T. C Weston, 1884 : one specimen. 



Favosites peolificus, Billings. 



Fy,vosites prolificu-'', Billings. AS66. Geol. Siirv. Canada, Cat. Silur. Foss. Anti- 



costi, p. 6. 



Lower beds. Dr. R. W. Ells, 1875, (one large specimen) and T. C. 

 Weston, 1884, (three smaller specimens). Four small specimens which 

 are also probably referable to this species, were collected in the upp'^r 

 beds by Mr. Weston in 1884. The large specimen collected by Dr. Ells 

 is labelled " Favosites prolificus " in Mr. Billings's own handwriting. It 

 is fully ten inches in its maximum diameter but nowhere quite three 

 inches in height. Its corallites are polygonal, nearly uniform in size and 

 average about two millimetres in diameter. The tabulfe are very numer- 

 ous, complete and placed close together. The mural pores, which were 

 first noticed by Mr. Lambe, are very well preserved and situated close to 



