394 THE CANADIAN NATURALIST. [Vol. vi. 



epidermis liuing the umbilical chambers, and conspicuously pre- 

 served, even in these fossil specimens, between the closest parts of 

 the parietal region. In this respect it bears the same relation to 

 Torellia as does Latiaxis to Rapaua, Separatista to Rhizochilus, 

 or Zanclea to Torinia. It presents a rude resemblance to Separa- 

 tista Chemnitzii (Add. Greu. pi. xiv. f. 6), or still more to S. 

 Blainvilleana (Chenu Man. p. 172, § 853), but without the 

 grooved pillar, or the keels of the latter species. 



As to the "blunt tubercle" or " callous protuberance " of 

 Torellia, described by Mr, JeiBfreys, but scarcely to be traced in 

 Mr, Sowerby's figure, it certainly does not exist in our fossils. 

 It is not always a character of importance, as may be seen by 

 comparing Purpura columellaris with P, patula, Cuma tectum 

 witii the rem -lining species of the genus, or the gradual transition 

 from Isapis to Fossarus, The Naticidae are often very irregular 

 in the callous region of the pillar, even in the same species. 



Velatlna zonata, Gould. 



Fossil — Montreal ; Beauport, 



Recent — Arctic seas to Massachusetts. 



According to Jefi"reys, this shell is the same with V. undata^ 

 Smith, from the Clyde beds, and is found in the Crag and in the 

 Post-pliocene of Uddevalla, 



Scalaria Gr(jenla7idlca, Perry, 



Fossil — Eiviere-du-Loup ; Quebec ; Saco ; also Scottish Post- 

 pliocene and English Red Crag, under same varietal forms as in 

 Canada. 



Recent — Arctic seas, and American coast, as far south as 

 Massachusetts. 



The specimens from Riviere-du-Loup are very large, one being 

 nearly two inches long ; and, as Dr. Beck has remarked, the 

 varices of some of the specimens are more slender and lamellar 

 than in recent specimens, others, however, are similar to the 

 more common recent variety. 



Acirsa Uschrichtii, Holboll. 



Fossil — Quebec; Riviere-du-Loup ; Montreal ; most abundant 



at Riviere-du-Loup. 



Recent — Murray Bay ; Greenland; also Eastport (Verrill ) 

 This shell was named in former papers Jlenestho albida, the 



eroded specimens found being referred to that species. It has, 



