DEVONIAN ROCKS OF CANADA WEST. 113 



they are more vesicular at the sides of the cells than in the centre, 

 where they are from half a line to one line and a half distant. 



MM. Edwards and Haime in their description of this species say 

 that there are two vertical series of powers on the larger plane sides 

 of the cells and one on the smaller. Our specimen, however, shew 

 that this is not a constant character.* 



Locality and Formation. — Devonian ; Onondaga and Corniferous 

 limestones. Kama's farm, Port Colborne. Savage's quarry, lot 6, 

 eon. 1, "Wainfleet. Oxford, near Woodstock, and in numerous other 

 localities in Western Canada. This species occurs in Michigan and 

 iu Preston County, Virginia. 



MiCHELINIA INTEBMITTEKS. — (BilHngS.) 



Corallum forming large hemispherical masses ; calicos nearly equal 

 in diameter, with periodical constrictions within the distance 

 of half a line to one line and a-half. Diaphragms numerous, thin, 

 slightly convex, sometimes shewing four or five vesicular swellings 

 upon a single surface. The septal striae are but slightly developed, 

 about fifty to the inner circumference of the cell. Pores only visible 

 in the intervals between the constrictions where the walls are thin, 

 three or four series on each plane side of the tube. The cells are 

 from three to four lines in diameter. 



The constrictions give to the cells of this species a circular aspect, 

 whereas they are in fact polygonal. I am not certain that this fossil 

 is different from the species described by Edwards and Haime (op. 

 cit. p. 299,) under the name of Chonostegites Olappi. If so it should 

 I think be called Michelinia Clappi, as it exhibits all the characters 

 of Michelinia. The constrictions appear to be occasioned only by 

 the periodical thickening of the walls of the cells. Where not con- 

 stricted the cells have the usual prismatic shape, with pores and 

 septal striae. 



Locality and Formation. — The only specimen I have seen waa 

 collected by Mr. Murray, near Woodstock, C. W. It was found 

 loose, but in lithologieal characters, it resembles the other species 

 from the Corniferous limestone of that region. 



*See Polypiers Fossilea des Terraina PaljBozoiques, page 251., 



