92 



plates have a large hemispherical protuberance which occupies all of the 

 plate, except a narrow flat border all round. The rhombs consist of two 

 separated triangular spaces, their bases separated as in A. elegans, Hall. 

 The column has from three to four lines in length at the point of attach- 

 ment, encased in an ovoid mass which is either a secretion of the column 

 itself, or a parasitic Zoophyte, or, perhaps, a sponge. The surface of this 

 part, as well as that of the tumid part of the plates, is covered with small 

 polygonal pits. Near South Bay, Manitouhn Island ; Prof. R. Bell, H. 

 G. Vennor. 



ZOOPHYTA. 



Genus zaphrentis, Rafinesque. 



Z. CINCTOSA, n. sp. — This species is three or four inches in length, and 

 from nine to fifteen lines in diameter, engirdled with strong angular annu- 

 lations, usually most abruptly elevated on the upper side, the spaces 

 between concave. Tabulae well developed ; septa extending nearly or 

 quite to the centre in the body of the coral, but in the bottom of the cup 

 (as shown by one specimen) only about half way to the centre. Some 

 of the individuals are more or less curved. Surface with very distinct 

 rounded septal ridges, nearly three in one line, crossed by minute engird- 

 ling striae. Huronia Point, and two miles north of McLeod's Harbour, on 

 the east side of Cockburn Island, Lake Huron, also in the township of 

 Derby, near Owen Sound, in the Clinton and Niagara formations. Prof. 

 R. Bell. 



Z. BiGSBYi, n. sp. — Turbinate, either straight or gently curved ; from 

 four to six inches in length, and from one inch to nearly three inches in 

 diameter. Tabulae well developed ; three or four septa in the width of 

 two lines. Cup moderately deep, with a rounded elevation in the bottom. 

 Surface unknown. Differs from Z. Stokesi in its larger size, and more 

 developed tabulae. Huronia Point, and two miles north of McLeod's Har- 

 bour, on the east side of Cockburn Island, Lake Huron. Clinton and 

 Niagara formations. Prof. R. Bell. 



Genus CYSTiPHYLLUM, Lonsdale. 



C. HuRONENSE, n. sp. — From one to three inches in length, rather 

 slender, straight or irregularly curved. Cup well developed, conical, 

 inner surface with depressed convex vesicles, the largest of which rarely 

 exceed the diameter of one line. Surface usually decorticated, but when 

 perfect with from eight to ten septal striae in the width of two lines. 

 Huronia Point, and two miles north from McLeod's Harbour, on the east 

 side of Cockburn Island. Chnton and Niagara formations. Prof. R. 

 Bell. 



