Post-Pliocene Deposits oj the St, Lawrence. 31 



All the species found in the Canadian tertiary clays are widely 

 distributed in the North Atlantic, and some of them still more 

 extensively. Polymorphina lactea is found in the British crag:,* 

 and Eatosolenia globosa in Miocene deposits at Petersburgh, U.S.f 

 They afford little indication of climate, Miliolina seminulum, 

 for instance, extending in the present seas from Greenland to Cuba. 

 Willi respect to depth of water, their indications are probably 

 more precise, though on this subject I can find little reliable infor- 

 mation. One fact is certain, that in Gaspe, at present, a depth 

 of 10 to 20 fathoms corresponds bathy metrically, in so far as these 

 creatures are concerned, with that represented by the upper layers 

 of the Leda clay, or brick-clay of Montreal. I have obtained, 

 however, at least one indication that there are still lower depths, 

 not represented as yet by the fossils of our tertiary deposits. 



I owe to the kindness of Capt. Orlebar, R.N., two small speci- 

 mens of fine clay, taken up by the sounding-lead from depths of 

 187 and 196 fathoms, off Mount Camilla, near Bic Island, in 

 the River St. Lawrence. On carefully levigating these specimens, 

 I found in them three species of Foraminifera, all distinct from 

 those of the tertiary clays and of Gaspe, and the silicious shields 

 of a number of microscopic plants (Diatomacece). The Foramini- 

 fera I refer to the following species : — 



Rotalina lurgida, "Williamson. (Fig. 20.) 

 Spiroloculina depressa, D'Orbigny. (Fig. 21.) 

 Bulimina auriculata, Bailey. (Fig. 22.) 



Fig. 22. 



Wood. 



f Bailey. 



