21G THE ICK A(;i<: IX CAXADA. 



pocket lens, and are nsnally in as tine preservation as 

 recent specimens, especially in the deeper and more 

 tenacions layers of the Leda clay. Tlicy are, however, 

 usually more abundant in the somewhat arenaceous layers 

 near the toj* of the Leda (day, and immediately l)elow the 

 Saxicava sand, and es])ecially where this layer contains 

 abundance of shells of mollnsca. I have nowhere found 

 them m(»re abundant or in greater variety than at the 

 Crleu l)rick-work near ^Montreal, on the Mcdill College 

 grounds, and at Lf)gan',s Farm. At the (Uen l»rick-work 

 a few worn specimens of rolystomella are contained in 

 the beds underlying the Leda clay and e(piivalent to the 

 boulder-clay, which, however, has in general, in the vicinity 

 of Montreal, as yet att'orded no marine fossils. 



In searching for Foraminifera in the clays of Kiviere- 

 du-Louj), 1 have observed in the finer washings severiil 

 species of ])iatomacea- : and among these a species of 

 Coscmodixciis very fre([uent in the deeper parts of the 

 gulf of St. Lawrence. lUit on the whole diatoms a})pear 

 to be rare in these deposits, in the Hi\ icre-du-Loup 

 clays I have also observed the ])ollen grains of firs and 

 spruces. 



The nomenclature used above is that of Parker and 

 Jones, in tlieir ])aper on the North Atlantic Soundings, in 

 the Transactions of the lioyal Society. For figures of the 

 species, I may refer to that memoir, and to my previous 

 papers published in the Co/Hn/iidt JS^dfnndisf. 



(2) Poriftm. 

 Tefhea Lo<iiiui. r)awson. 



Leda clay, Montreal. This species has not yet been recognized in a 

 living state. Its spicules in consideialile masses, looking like white 

 fibres, are not uncommon in the I'leistoeene at Montreal. 



