392 ^ THE CANADIAN NATURALIST. [Vol. vi. 



Natica ciffinis, Gmelin. 



(Natica clausa, Brod. and Sowerby.) 



Fossil — Montreal ; Quebec ; Eiviere-du-Loup ; Labrador ; 

 Portland, Maine. 



Recent — Greenland to Cape Cod. 



Common and extensively distributed in the Post-pliocene of 

 Europe, from Norway to Sicily, and found at an elevation of 

 1330 to 1360 feet in Moel Tryfaen, Wales. (Darbyshire). 



Lunatia heros, Say. 



Fossil — Beauport, a single specimen only, and this of small 

 size. 



Kecent — Labrador and southward. 



This species is as old as the Miocene Tertiary ; and in the Post- 

 pliocene, Canada was probably its extreme northern limit. 



Lunatia Groenlandica, Beck. 



Fossil — Montreal ; Quebec ; Biviere-du-Loup ; Maine ; also 

 Post-pliocene of England, Scotland, and Norway. 



Becent — Arctic seas generally; and extending to Britain and 

 New England. 



L. pallida is the representative of this species on the west 

 coast of America. 



Choristes elegans, Cpr. 



Fossil — Saxicava sand, Montreal, rare. 



This shell was identified in my former papers with Natica 

 helicoides ; but it is now found to be quite distinct, and Dr. P. 

 P. Carpenter describes it as a new species and genus as follows : 



Grenus Choristes. 



Testa helicoidea, tenuis ; epidermide induta ; anfractus dis- 

 juncti; labrum postice angulatum, antice baud emarginatum; 

 labium planatum ; columella simplex. Animal ignotum. 



Choristes elegans, n. s. 



Ch. t. satis elevata, tenui, nitente ; epidermide fulva, tenui, 



laevi, extus et intus omnino appressa; anfr. iii. -\- ?, vertice 



nucleoso decollate, spiraliter obsoletius striatis ; lineis incrementi 

 tenuissimis ; spira superne planata, suturis maxime impressis, 

 basi tumente; umbilico intus majore, extus modico; apertura 

 sublunata, postice ad angulum circ. 30° inclinata, antice late 

 rotundata ; labro acuto, postice planato ; labio acuto, planato, 

 baud reflexo ; columella postice regulariter arcuata, neque emar- 

 ginata, nee angulata, nee insculpta. 



