PLEISTOCENE FOSSILS. 251 



Natica dmisa. Brod. and Sowerby. 



Fossil— Montreal ; Quebec; Riviere-du-Loup ; St. John, &c., N.B. 

 (Matthew) ; Labrador ; Anticosti ; Chaudiere Station ; Portland, 

 Maine ; Vancouver Island. (G. M, D.) (Plate VI., Fig. 4.) 



Recent— Greenland to Cape Cod ; Little Metis ; Gaspe ; Tadousac ; 

 Kamouraska ; also British Columbia. 



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). It has been identified with 

 N. affinis, Sm. , but Sars and Verrell consider this quite different. 



Lunatia heros. Say. 



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

 River Charles, N.B. (Matthew); New Richmond; also a depauperated 

 variety ; Benjamin River, supposed by Matthew to be possibly a 

 distinct species or variety. Var. Chahnersi (Matthew). 



Recent — Labrador and southward. 



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

 cene, Canada was probably its extreme northern limit. 



Lunatia Greenlandica. Beck. 



Fossil — Montreal ; Quebec ; Riviere-du-Loup ; Anticosti ; Maine ; 

 also Pleistocene of England, Scotland, and Norway. 



Recent — Little Metis ; Gaspe ; Riviere-du-Loup ; 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. (Plate I., Fig. 13.) 

 This shell was identified in my former papers with Natica helicoiden; 



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



d ascribes it as a new species and genus as follows : 



Genus Choristes. 

 Testa helicoidea, tenuis ; epidermide induta ; anfractus disjuncti ; 

 labram postice angulatum, antice baud emarginatum ; labium plana- 

 tum ; 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. + ?, vertico nucleoso 



decollato, spiraliter obsoletius striatis ; lineis incrementi tenuisaimis ; 



