T ost-Vliocene Deposits of the St. Lawrence. 27 



Fig. 1. 



1. Pohjstomella umbilicatula, Walker (Fig. 1).* — Nine tenths 

 of the foraminifera from the Montreal clays belong to this species, 

 which also occurs at Beauport, and in equal proportionate abun- 

 dance living in Gaspe Bay. The specimens all belong to the 

 variety incerta of Williamson ; and as among many hundreds of 

 specimens I can find none that present the typical characters of 

 the species, and as the general form is also less compressed than 

 in the typical specimens as described and figured by Williamson, 

 I should be inclined to believe this so-called variety in reality a 

 distinct species, were it not for the fact, that, while these curious 

 little creatures are almost indefinitely variable, there is a re- 

 markable persistency of certain varieties in particular localities. 

 The modern specimens from Gaspe correspond precisely with 

 their ancient progenitors of the Post-Pliocene clays. The size of 

 the fossil specimens is large for the species ; the diameter of some 

 individuals being ^(h. of an inch. 



Localities. — Logan's farm, Montreal ; Brick-yards at Tanneries, 

 Montreal ; Beauport ; also recent in Gaspe Bay. 



2. Nonionina crassula, Walker. — Among the fossil specimens of 

 the last species, there are many not distinguishable from it in 

 external form, in which I cannot find, either when viewed as 

 opaque or transparent objects, the characteristic septal apertures 

 of Polystomella. These specimens are usually smaller, more 

 hyaline, and smoother than those showing the apertures. If dis- 

 tinct, they must belong to the species above named. I found no 

 individuals of this description among my recent specimens from 

 Gaspe. 



* See also paper in Can. Nat. Vol. 2, Fig. 17. 



