wHiTEAvEs.] DEVONIAN FOSSILS, MACKENZIE RIVER BASIN. 205 



outer walls are conspicuously elevated, average about three millimetres 

 and a quarter in diameter. They are placed at distances apart equal to 

 from once to twice their own breadth, and their septa average eleven 

 or twelve of each kind. 



P. Hennahi occurs, though rarely, in the corniferous limestone of 

 Ontario. Throe specimens which appear to be identical with it are in 

 the Museum of the Survey, two labelled " Woodstock, A. Murray," 

 and the other " Cayuga, B. De Cew," each of which must have been 

 collected more than twenty years ago. 



Phillips ASTRiEA VERRiLr.ir, Meek. (Sp.) 



Smithia Vemtlii, Meek. 1868. Trans. Chicago Ac. Sc, vol. 1, p. 83, pi. xi, figs. 

 7a-b. 



HayEiver, forty miles above its mouth, R. G. McConnell, 188*7: two 

 specimens. 



This coral seems to differ from the preceding species in the much 

 less elevated outer edges of the calicos of its corallites. Its calicos, 

 also, appear to be smaller and somewhat more distantly arranged than 

 those of P. Hennahi, the average diameter of those of P. Verrillii being 

 not quite two millimetres, and their septa usually eight or nine of 

 each kind. 



Pachyphyllum Devoniense, Edwards & Haime. 



Pachyphyllum Devoniense, Edwards and Haime. 18.51. Polyp. Foss. Terr. Pal;eoz., 



p. 397. 

 Pachyphyllum Devoniense, Edwards and Haime- 1854. Men. Brit. Foss. Corals, 



p. 234, pi. lii, figs. 5 and 5a. 



Peace Eiver, between Vermilion Falls and the mouth of Little Red 

 -River, Professor Macoun, 1875: a single specimen whose internal 

 structure corresponds much better with Edwards and Haime's diag- 

 nosis and figures of this species than with Hall and Whitfield's descrip- 

 tion of P. Woodmani, or with authentic examples of the latter coral 

 fi'om Iowa. 



The specimen from the Peace Eiver is an irregular convex mass, 

 about ten centimetres or four inches in its maximum diameter, of com- 

 pound corallites, which have no definite walls. The calices are 



