Post-Pliocene Deposits of the St. Laivrence, 



29 



referable to it, as I had not then observed the internal tube, and 

 supposed it in consequence to be an Orbulina. Figs. 4 and 5 

 show this internal structure. This species is very small, scarcely 

 exceeding T |o' n of an inch, and is very smooth and translucent. 

 Locality. — Logan's farm ; Tanneries. 



Fig. 6. Fig. 7. 



6. Entosolenia costata, Williamson (Figs. 6, 7 ; also Fig. 22 in 

 paper of last year.) — This beautiful little shell differs from that 

 last described only in the possession of longitudinal narrow ribs. 

 Williamson, who had seen only two or three examples, establishes 

 it as a separate species with some doubt ; and since in my speci- 

 mens from the Montreal clays the number and distinctness of the 

 ribs are very variable, I think it probable that this shell is only a 

 variety of E. ylohosa. 



Locality as above. 



Fig. 10. Fig. 9. Fig. 8. 



y l. Entosolenia Squamosa (Figs. 8, U, 10). — This, the most 

 elegant of all our Post-Pliocene foraminifera, presents several 

 beautifully ornamented varieties. In the last species the sides are 

 marked by simple longitudinal ribs. In the simple varieties o* 

 this the ribs are cossed by more slender transverse bands 

 In others the reef angular spaces thus formed appear to have 

 circles inscribed in them. In others the distinction of longitu- 

 dinal and transverse ribs disappears, and the whole sin face be 

 comes covered with a regular hexagonal network of raised lines o T 

 various degrees of fineness. I have endeavoured to represent 



