No. 4.] DAWSON — POST-PLIOCENE. 395 



however, been correctly described by Dr. Beck in Lyell's paper 

 on Beauport, and named Scalaria horealis. It is not this species 

 of Gould, however. 



Tricliotropis horealis, Brod. and Sow. 



Fossil — Montreal ; Biviere-du-Loup ; Labrador, &c. ; very 

 abundant at Montreal, 



Becent — Labrador, Murray Bay, Gasp^, Arctic seas, and as 

 far south as Massachusetts. 



Trichotropis arctica ? Middendorff. 



Fossil — Montreal, very rare. 



A single imperfect specimen represents this species, which is 

 recrnt at Behring's Straits. The identification is perhaps doubt- 

 ful. 



The figure given by Beeve of T. Kenseri of Phillippi from 

 Spitzbergen, resembles our shell, except in the small number of 

 revolving bands. 



Admefe viridida, Fabricius. 



Fossil — 3Iontreal. 



Becent — Labrador, (Packard); Murray Bay; Gasp^, (White- 

 aves) ; also Greenland and Labrador. It is the Tritonium vir- 

 idulum of Fabricius, and is a rare shell in the Canadian Post- 

 pliocene, and in the Gulf of St. Lawrence. 



Aporrliais occidentalis, Beck. 



Fossil — Labrador (Bayfield) ; also Packard. 



Becent — Labrador to Massachusetts. 



It is remarkable that this species, which is found living from 

 Labrador to Cape Cod, is so rare in the Post-pliocene. 



Fasciolaria ligata, Mighels. 



Fossil — Montreal, very rare. 



Becent — Murray Bay; Mingan (Foote) ; Gaspe, (Whiteaves); 

 Nova Scotia, (Willis) ; rare in all these localities. 



A single mutilated specimen alone, as yet, represents this 

 species in my Post-pliocene collections. 



Astyris HolholUi, Moller. 



Fossil — Biviere-du-Loup ; also glacial beds Britain (Jeffreys). 



Becent — Gaspe; Murray Bay; Labrador, (Whiteaves). If 

 identical, as I suppose, with Columhella rosacea., Gould, it ex- 

 tends south to New England, and Gould's name has priority. 



