244 G. J. Hinde — A Neiv Favosite Coral. 



beds of Caradoc age (G. J. Williams). Bwlch-y-Gasy, near Corwen, 

 and near Cynwyd, in a micaceous clay slate of similar age (British 

 Museum). South of Cefn Cock, near Llangollen, similar matrix and 

 horizon (Museum Practical Geology). 



EXPLANATION OF PLATE VI. 



Fig. 1. Ramipora Jloehstetteri, Toula; var. carinata, R. Eth., jun. Caradoc, 

 nr. Corwen (Cabinet of Mr. G. J. Williams, Tanygrisian) . 



la. General view, natural size. 



lb. Portion of a frond, enlarged about twice (drawn from a plaster cast). 

 Fig. 2. Ibid. nr. Llangollen (Mus. Pract. Geology, nat. size). 

 Fig. 3. Ibid. nr. Corwen (Brit. Mus., nat. size). 



II. — On a New Genus of Favosite Coral from the Niagara 



Formation (U. Silurian), Manitoulin Island, Lake Huron. 



By G. Jennings Hinde, F.G.S. 



CEPTAIN zones of the massive grey dolomite belonging to the 

 Niagara Formation in North America are so largely composed 

 of fossil corals as to indicate similar conditions of formation to that 

 of the coral reefs of the present age. Perhaps no better examples 

 of these Palaeozoic coral reefs could be found than those which are 

 exposed in many tracts of the surface of the Great Manitoulin Island, 

 which are literalty covered with complete and fragmentary corals in 

 a silicified condition, which have been weathered out of the matrix 

 of hard dolomite in which they had been imbedded. The great 

 majority of these corals belong to the well-known genera Favosites, 

 Halysiies, Heliolites, Alveolites, Ccenites, Syringopora, Strombodes, 

 Cyathophyllum, Zaphrentis and Omphyma, and many of the species 

 are also common to the Silurian rocks of Europe. A recent search 

 in the debris of one of these ancient reefs has brought to light a 

 coral which appears to belong to a new genus, with the following 

 characters. 



Syringolites, gen. nov. 



Gen. char. — Corallum composite, growing in large flattened masses 

 with a basal epitheca. The corallites are polygonal, comparatively 

 thin-walled, closely in contact, vertical in their direction of growth, 

 and with one or more rows of mural pores on each of their prismatic 

 sides. In the centre of each corallite is a cylindrical tube, with non- 

 perforate walls, formed apparently by the invaginated extension of 

 a series of funnel-shaped tabulae. This median tube appears to be 

 continuous as a rule, though rarely a thin horizontal plate may be 

 seen crossing it. The upper surface of the funnel-shaped tabulae 

 carries numerous well-marked rows of short septal spines or tubercles, 

 which converge from the sides of the corallites to the central tube 

 into which they also extend. In certain examples the walls of the 

 calices are crenulated by vertical septal ridges. 



Obs. — The only genus with which the above is at all closely allied 

 is that of Rcemeria, Edwards & Haime (Polyp. Foss. des Terr. Pal. 

 p. 253). This genus was formed to include the single species of 

 Calamopora infundibulifera, Goldfuss (Petrefacten Germ, part i. p. 78, 

 plate xxxii. figs. 1 a, b), and is thus described : "Polypier en masse 



