PLELSTOCENK FOSSILS. 215 



LitHold and Snccammhui. 



A very few minute sandy forms referable to these genera are found 

 among the tiner parts of the wasliings from Rivicre-du-Loup. 



Eiiijlypha? 



A single minute test, apparently identical in form with that of 

 ICuijIyphd a/reo/(it(i, was ff)uud in washing the Riviore-du-Loup clays. 



Ill goiioml terms it iiiuy 1)0 stcated that all the species 

 of Foraiuinifera fouud in the Pleistocene still inhal)it 

 the gulf and river St. Lawrence. Several species found 

 in the gulf of St. Lawrence have not yet been recognized 

 in the Pleistocene, and these are mostly inlial)itants of 

 depths exceeding 1)0 fathoms, or among the more souiherii 

 forms found in the gulf. 



On the whole, the assemljlage, as in the northern part 

 of the gulf of St. Lawrence at jn'csent, is essentially 

 arctic, and not indicative of depths greater than 100 

 fathoms, which would seem to have been the maximum 

 depth of the sea of the Leda clay, and corresponds with 

 well-marked terraces on the hills. 



The sandy forms, which are not uncommon in the Gulf, 

 are very rare in the Pleistocene : but this may l)e 

 accounted for by the greater dilHcultv of washing them 

 out of the clay, or possibly their cementing material may 

 have decomposed, alhjwing them to fall to i)ieces. As the 

 epidermal matter of shells is often preserved, the last 

 sui)position seems less likely. The Leda clays are, 

 however, usually very fine and calcareous, so tliat there 

 was probaljly more material for calcareous than for arena- 

 ceous forms. 



The Foraiuinifera are very generally dillused in the 

 Pleistocene clavs, though much more abundant in some 

 layers than in others. They may easily be detected by a 



