428 Silurian and Devonian Fossils of Canada. 



within at the distance of half a line to one line and a-half. Dia- 

 phragms 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 cons- 

 trictions 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 Claj^pi. 

 If so it should I think be called Michelinia Clafflii, 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 constricted the cells have the usual prismatic 

 shape, with pores and septal striae. 



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

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

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

 from the Corniferous limestone of that region. 



Michelinia favosoidea (Billings). 



Description. — Corallum forming large hemispheric or flattened 

 masses ; cells unequal in size, adult diameter about two lines and 

 a half; diaphragms, flat, horizontal, with small vesicular swellings, 

 usually around the margins of the upper surface ; septal stride very 

 obscure, six to eight on each plane side of the cells ; pores, very 

 . small, irregularly distributed, sometimes in rows of five or six 

 across the cell, about one-sixth of a line distant from each other 

 in some places, and sometimes absent in spaces of half a line in 

 width. This species has much of the aspect of Favosite favosa, 

 Goldfuss, but is notwithstanding very clearly a true Michelinia. 



Formation and Locality. — Corniferous. Rama's farm, Port 

 Colborne. 



Collector. — E. Billings. 



Genus Zaphrentis (Rafiuesque). 



Generic Characters. — Corallum simple, elongated, free and tur- 

 binated, surrounded by a complete epitheca; cup more or less 

 deep ; no columella 1 ; a single fossette well developed and oc- 



