Prof. F. M'Coy on some new Mountain Limestone Fossils. 167 



XV. — Descriptions of some new Mountain Limestone Fossils. By 

 JFrederick M'Coy, Professor of Geology and Mineralogy in 

 Queen's College, Belfast. 



Cyathopsist e/'uca (M'Coy). 



Sp. Char. Corallum very small, subcylindrical after a diameter 

 of 3 lines, which it reaches at 6 lines from the apex, slightly 

 curved ; length of large example 1 inch 2 lines, diameter 3^^ 

 lines ; surface marked with coarse, longitudinal, obtuse lamellar 

 striae, three in the space of 1 line; radiating lamellae strong, 

 slightly irregular, connected by several curved thick transverse 

 vesicular plates in the horizontal section, one of the lamellae 

 stronger than the rest, and extending through the centre, 

 where it is either thickened or confounded with a slight 

 mesial boss of one of the transverse septa : vertical section, 

 middle third traversed by thick, subregular, transverse dia- 

 phragms, convex upwardly, three interdiaphragmatal spaces 

 in 1 line; outer third on each side formed of one or two 

 rows of irregular large cells, formed by the junction and occa- 

 sional duplicature of the deflected edges of the diaphragms. 



This so exactly resembles the Cyathaoconia cornu in size, shape 

 and general external appearance, that it might be very easily 

 confounded with it; even externally, however, it might be di- 

 stinguished by the smaller number in a given space of its much 

 coarser lamellar vertical sti'iae ; internally it is easily distinguished 

 by wanting the solid styliform axis, by the distinct transverse 

 vesicular plates between the lamellae in the horizontal section, 

 and the transverse septation, &c. of the vertical section. 



Very common in the black carboniferous limestone and shale 

 of Beith, Ayrshire. 



{Col. University of Cambridge.) 



Caninia subibicina (M'Coy). 



Sp. Char. Corallum much curved, increasing, when young, at 

 the rate of 6 lines in 1 inch to a diameter of 1 inch 3 lines, 

 after which it remains nearly cylindrical for 3 or 3 inches 

 more ; surface with a thin, nearly smooth epitheca, marked 

 with obsolete transverse undulations of growth ; when the 

 epitheca is removed, the very fine, equal, costal striae are 

 brought into view, five in 3 lines at a diameter of 1 inch 3 

 lines ; the o\iter, small, vesicular area is rather more than a 

 line wide, within which the sixty-five thick primary radiating 

 lamellae extend, about 4 lines towards the centre, leaving the 

 broad, flat, smooth, slightly undulated central portion of the 

 diaphragms about 6 lines in diameter in parts of the circum- 



