1865.] BILLINGS — PALEOZOIC FOSSILS. 431 



the height of two inches, (as shown by a polished section of a 

 specimen) the central area is filled with irregular tabulae. The cup, 

 in a specimen four inches in length, is eighteen lines in depth, 

 conical, or much narrowed towards the bottom. Surface with five 

 strong, rounded septal ridges in the width of three lines. On 

 approaching the base these are more closely crowded together than 

 they are in the higher and main body of the coral. They 

 are crossed by fine engirdling striae just visible to the naked eye. 

 Length of the largest specimen observed four inches. Numerous 

 small straight individuals from one inch and upwards occur with 

 the larger. Wreck Point ; in the Hudson River group ; and, 

 also, in numerous localities in Divisions 1 and 2 ; Anticosti 

 group; Middle Silurian. J. Richardson and T. C. Weston. 



Genus Erldophyllum, Edwards and Haime. 



E. Vennori. — Corallites about two lines in diameter and either 

 in contact or at various distances from each other up to two or 

 three lines. The normal distance appears to be about one line, but 

 where the corallites are crooked, as they are in one of the specimens 

 collected, considerable variations occur. There appear to be from 

 twenty-four to thirty septa, some of which meet in the centre. The 

 tabulae are imperfectly developed, but are seen, in some of the 

 corallites, forming with the septa square cells near the margin. 

 The connecting processes are from one to three lines apart. Sur- 

 face with obscure septal strias and transverse undulations. This 

 species may form the type of a sub-genus, differing from the above 

 in the greater development of the septa and rudimentary tabulae. 

 Manitoulin Island; Clinton formation. Prof. R. Bell, and H. G. 

 Vennor ; dedicated to the latter. 



Genus Chonophyllum, Edwards and Haime. 



C. Belli. — Sub-turbinate, enlarging from a pointed base to a 

 diameter of eighteen lines in about two inches, then becoming- 

 more cylindrical. Length three or four inches ; greatest diameter 

 observed, at the cup, thirty lines. Cup, in the largest specimen 

 seen eight lines wide and six lines deep with slightly sloping walls, 

 apparently flat in the bottom with the exception of a rough 

 styliform projection in the centre ; edge of the cup narrowly 

 rounded, a broad flat or gently convex margin all round which is 

 nearly horizontal or slightly sloping outwards and downwards. In 

 the inside of the cup there are about seventy thin, sharp, slightly 

 elevated septa, alternately larger and smaller. These, in radiating 



