NOTES ON THE FOSSILS OF ONTARIO. 141 



10. Ch^tetes, sp. — A branching form nearly allied to the pre- 

 ceding, but differing in tlie mucli larger size of the corallites, of 

 which only foiu or five occupy the space of one line. We are at 

 present unable to identify this species, but it is nearly allied to a 

 Devonian species (C. Barrandi, Nich.) and is certainly distinct from 

 C. lyco2ierdon. 



Locality and Formation. — Clinton Group, Dundas. 



11. Glyptocrinus plumosus, Hall. {Ref. Pal. N.Y., Vol. II., 

 pi. xli.. A, figs, '^a-g.) Owen Sound and Dundas. 



12. Helopora fragilis. Hall. {Ref. Pal. KY., Vol. II., pi. 

 xviii., fio^s. ?>a-f.) Polyzoary composed of cylindrical stems, which 

 have a length of from a line and a half to three lines, and a diameter 

 of from a third of a line to half a line. Usually the stems are quite 

 straight or slightly curved proximally, very rarely branched, and 

 very generally tapering towards the base and thickened into a 

 swollen, rounded, or clavate distal extremity. Cells tubular, sjjring- 

 ing obliquely in a radiating manner from an imaginary central axis, 

 and openiiag at the surface by oval or sub-angular mouths, the lower 

 lips of which are, in perfect specimens, somewhat prominent. About 

 ten or twelve cells in the space of a line measured vertically. The 

 cells are arranged in longitudinal rows, those of contiguous rows 

 alternating with one another, so as to give rise to a series of 

 diagonally spiral rows. According to Hall, the cells are arranged 

 between longitudinal lines which are elevated above the general 

 surface, but this character does not appear to be universally recog- 

 nisaVjle. 



In many respects this curious little form- presents a close resem- 

 blance to the more slender examples of Clmtetes or StenoiJora, from 

 which, indeed, it is chiefly separable by the absence of tabidce and by 

 its general form. 



Locality and Formation. — Clinton Group, Dundas (exceedingly 

 abundant). 



13. Rhinopora verrucosa, Hall. {Ref. Pal. N.Y., Vol. II., pi. 

 xix., figs. \a-c.) Polyzoary forming laminar expansions, in some 

 instances of a funnel-shaped form, which are celluliferous on the two 

 sides, and have a thickness of from a hundredth of an inch to a third 

 of a line. The surface is in general even, but is sometimes traversed 

 by ii-reguiar anastomosing and reticulating ridges, and it exhibits. 



