m 



THE CANADIAN NATURALIST. 



[Vol. 



VI. 



In the specimen above figured there is an aperture in the beak, 

 but in another there is no appearance whatever of a perforation. 

 This genus resembles Acrofreta, but difi'ers therefrom in having 

 a large convex deltidium. It seems to be also closely allied to 

 Kutorgina. The shell which I have described under the name 

 of Oholus Lahradoricus belongs to this genus. 



/. hella was found by T. G. Weston, in a boulder of limestone 

 associated with numerous fragmentary trilobites, of primordial 

 age, near Trois Pistoles below Quebec. A closely allied species 

 of the same genus occurs in the primordial limestone at Topsail 

 Head, Conception Bay, Newfoundland. 



FOSSILS IN TBE HURONIAN ROCKS. 



AsPiDELLA Terranovica, uov. gen. and spec. 



14 



Fig 14 Aspicldla terranovica^ two specimens on a small slab of 

 stone, slightly restored. 



These are small ovate fossils five or six lines in length and 

 about one-fourth less in width. They have a narrow ring-like 

 border, within which there is a concave space all round. In the 

 middle there is a longitudinal roof-like ridge, from which radiate 

 a number of grooves to the border. The general aspect is that 

 of a small C/w7o?i or Patella, flattered by pressure. It is not 

 probable, however, that they are allied to either of these genera. 



Associated with these are numerous specimens of what appear 

 to be Arenicol'ites spiralis, a fossil that occurs in a formation 

 lying below the primordial rocks in Sweden. These fossils were 

 first discovered by A. Murray, Esq., F.G.S., in 1866. Other 

 specimens were collected by Capt. Kerr, R,N., Mr. Howley and 

 Mr. Robertson. 



They occur near St. Johns, in the Huronian. A more de- 

 tailed description will be given hereafter. 



