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Genus CYATHOPHYLLUM, Goldfuss. 



C. SOLITARIUM, n. sp. — The specimen is four inches in length, and 

 eighteen lines in diameter ; septa five or six in three lines. The edges 

 of the lamellae forming the vesicular cells, in the outer area, where, 

 exposed by weathering, have an angular bend upwards, mid-way between 

 the septa, giving the peculiar zig-zag appearance usually seen in silicified 

 specimens of Heliophyllum. This species resembles C. Anticostiense, but 

 appears to be more slender. Portage Bay, Manitoulin. Clinton and 

 Niagara formations. Prof. R. Bell and H. G. Vennor. 



Genus strombodes, Schweigger. 



S. EXIMIUS, n. sp. — Corallum composite, apparently forming large 

 depressed hemispherical colonies. , Corallites from nine to fifteen lines 

 across, the calice slightly concave in the outer half of the width, the 

 central depression three or four lines wide. There are about fifty septo- 

 costal radii in a corallite fourteen lines across. 



This species differs from >S'. penlagonus and >S'. striatus (both of which 

 occur in the same beds) in having much coarser radii. It very much 

 resembles a PhilUpsastrea. West point of Manitoulin Island, and two 

 miles north of McLeod's Harbour, on Cockburn Island. Clinton and 

 Niagara formations. Prof. R. Bell. 



Genus omphyma, Rafinesque. 



0. coNaREGATA, n. sp. — Corallites cylindrical, from six to twelve lines 

 in diameter, and three or four inches in length, growing together in large 

 colonies, connected with each other by small radicles, but not in contact. 

 Cup moderately deep ; a flat space in the centre, about one-third the 

 whole width ; from sixty to eighty radii. Huronia Point, Cockburn Island, 

 Lake Huron. Clinton and Niagara formations. Prof. R. Bell. 



0. Drummondi. — This is 0. verrucosa, E. & II., not of Rafinesque. The 

 coralUtes are turbinate, separate three or four inches in length, and some- 

 times eighteen lines in diameter. Cup deep, with about 100 radii. 

 Huronia Point, Cockburn Island, Lake Huron. Clinton and Niagara 

 formations. Prof. R. Bell. 



Genus trematopora. Hall. 



T. superba, n. sp. — The specimen is a hollow, cylindrical branched 

 stem, five inches in length, and about six lines in thickness. The pores 

 are about the tenth of a line in diameter, and from a little less to a httle 

 more than one line distant from each other. The thickness of the porifer- 

 ous crust is about one line. Cabot's Head, Lake Huron. Clinton and 

 Niagara formations. A. Murray. 



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