26 CONTHIBUTIONS TO CANADIAN PALEONTOLOGY. 



enabled to examine Meek's type specimens and to compare them with 

 specimens in the Survey collection, from the Hay, Mackenzie, Peace and 

 Moose rivers, and Lake Winnipegosis, that had been referred by Mr. 

 Whiteaves to Meek's species. 



Alveolites vallorum bears a striking resemblance to A. suborhicularis, 

 Lamarck, as figured by Goldfuss in the Petrefacta Germanise, pi. 

 XXVIII., figs, la — e. The resemblance in structural details between 

 the two' species is also seen in a description given by Nicholson of some 

 specimens of A. suborhicularis collected by him in the Eifel ; this author- 

 ity is inclined to separate a form with numerous spiniform septa and a 

 pedunculate base from one with an incrusting habit in which septa were 

 not seen. Prom Goldfuss's figures it would appear that the corallum is 

 very variable in shape and would include both forms. As regards the 

 septa, they can be recognized only under favourable circumstances in well 

 preserved specimens. The retention of Meek's species for the reception 

 of the Canadian specimens is, however, thought advisable until it can be 

 ascertained by direct comparison what the true relationship of A. vallorum 

 to A. suborhicularis really is. 



This species is represented in the collection by specimens from 

 Devonian rocks at the following localities : junction of the Red 

 and Peace rivers, A. R. C. Selwyn and J. Macoun, 1875 ; between the 

 Long Portage of the Missinaibi branch of the Moose River and Moose 

 Factory, R. Bell, 1877 ; Hay River, forty miles above its mouth, R. G. 

 McDonnell, 1887 and 1888 ; Mackenzie River at the " Ramparts" and at 

 " Rock by the river's side," R. G. McOonnell, 1888; Peace River at 

 Vermilion Falls, R G. McConnell, 1889 ; Lake Winnipegosis, J. B. 

 Tyrrell, 1889, on the Red Deer River, at several localities in Dawson 

 Bay, on Manitou Island, on a small island oflf Weston Point, and on 

 Snake Island. 



Genus Ccenites, Eichwald. 1829. 

 (Zool. Spec. t. I., p. 179.) 



Limarta, Steininger. 1831. Mem. Soc. Geol. de France,, t. I., p. 339. 



Corallum dendroid or forming thin expansions with a basal epitheca, 

 composed of flattened or subpolygonal corallites that reach the surface by 

 an abrupt bend and terminate in narrow slit-like calyces almost at right 

 angles to the surface ; walls of the corallites thin except at the surface 

 where they are suddenly thickened ; mural pores irregularly dispersed ; 

 tabulae complete, transverse, rather distant ; three longitudinal ridges are 

 sometimes present in the outer ends of the corallites. 



