No. 4.] DAWSON — POST-PLIOCENE. 399 



ibrm uutil I fortunately dredged a few specimens at Murray 

 Bay. It is a beautiful species, evidently quite distinct from 

 C. hlandirusf. From Middendorft's description and figure, I 

 think it not improbable that it may be the same with his Tri- 

 tonlam Scliantaricum, from the Sea of Okotsk. I was not 

 aware that it had been found on our coast, except at Murray 

 Bay, until these sheets were going through the press. Young 

 specimens are remarkably like in form and sculpture to 

 Fasciolaria Jlgata, which is found with it at Murray Bay. 

 Reeve's figure in Belcher's " Last of the Arctic Voyages," well 

 represents our specimens, though perhaps a very little coarser in 

 sculpture. 



Chrysodomus tornatus, Gould. 



Fossil — Montreal ; Quebec ; Riviere-du-Loup ; Murray Bay ; 

 Labrador (Packard). 



Recent — Gaspe Bay, large specimens (Whiteaves ; Labrador 

 (Packard). 



This shell is not uncommon in the drift, and owing to its 

 dense texture is generally in good preservation. It ranges from 

 the typical C. tornatus of Gould to Fiisits despectus of Lin- 

 naeus, as described by Fabricius, from Greenland, and shells of 

 similar form from the British Crag are considered by S. Wood 

 as varieties of i^. antiquus.^ Dr. P. P. Carpenter thinks that 

 this and the British F. antiquus may prove to belong to one very 

 variable species. The C. despectus is an Arctic form, and is 

 found ibssil in Canada. The C toi-natusis also fossil, and is the 

 form now found in the Gulf. C. decemcostatus is more southern. 



(Jhrijsodomus dccfmcostatna, Say. 



Fossil — Portland, Maine. 



Recent — Magdalen Islands and Gasp^ Bay (Whiteaves) ; 

 coasts of Nova Scotia and New England. 



This species has not yet been found in the Post-pliocene of 

 Canada, where it is represented by C. tornatus. There are still 

 two opinions as to whether Say's species is identical with C. 

 Ji/ratus, Mart. = Middendorffii, Cooper, from the Pacific coast. 

 The latter is variable, and graduates towards tornatus, Gould, 

 but the living New England shells are tolerably constant in 

 character. 



♦ The C. despectus of Reeve, however, is a very ditferent species, 

 from the Arctic regions of the North Pacific. 



