PLKISTOCKN'K l'()SSn.S. 227 



Class If. — Lamelmuhanciwata. 

 I'hofits (Zir/ihfo) rriHpntn. Linn, 



l''uss)il -Maine (I'liulianl). 



I liiivo not found this Hpecics fossil in Canada, Init it exists as ii 

 living siioll (Ml llio New Kngliind coast gtMicialiy, in Noiliiuiulicrland 

 Ktniit ; gulf of St. Luvrenoe, and, according to IJell, as far to the 

 noitii-west as liiniouski. I'ugut Sound (U.S. lOxpl. Kxped.) (Jueen 

 C'hailotto Islands (Widtt-aves). 



It has i>t!rha|is extended its northein linut to Canada since the 

 glacial period. On tiie European coast it is a northern shell, reaching 

 south to tiie Mediterranean. 



Saxirnrit niijonii, Lamarck (and var. (irr/ica). 



Fossil --Saxicava sand and top of Lcda day, Montreal; St. Xieholas, 

 Ottawa; L'Orign d ; Chaudiere Station; Upton, l'.(^).; Storniont, Ont. ; 

 (Quebec; Marra^\ ly; Riviere-duLoup ; Trois Pistoles; Tadou.ssac ; 

 Anticosti ! L.iliraitor ; Lawlor's Lake; Hathurst ; New Kiclunond ; * 

 Vancouver Island ((i. M. Dawson) ; New IJrunswick ; Maine, &c. 



Recent — Oulf St. Lawrence ; coast of Nova Scotia ; and New 

 England and northern seas generally ; also Br'tish Colunihia and west 

 coast of America as far as Mazatlan. (P. P. Carpenter), 



Very abundant in the more shallow-water ])ortions of the Pleisto- 

 cene tiiroughout Canada, and presenting all tlie numerous varietal 

 forms of the species in great perfection. It is relatively much more 

 iil)undant in the drift-deposits than in the gulf of St. Lawrence at 

 present. Pieces of limestone which have been bored probably by this 

 shell, are not rare in the drift at Montreal, 



This is a widely distiilnited arctic species, and is fouiul in the 

 Pleistocene deposits of Europe, and as far back as the Miocene, 



Punopiia Xorn-'jicd. Spengler, 



Fossil — Leda clay; Rivicre-du-Loup. Very rare. 



Recent — Little Metis; dredged in (iaspe Ray, 30 and 40 fathoms, 

 by Mr. Whiteaves ; Halifax (Willis); (irand Manan (Stimpson) ; 

 Arctic and northern seas generally. 



It is very rare in the Pleistocene, a few valves only having been 

 found at Riviere-du-Loup, The specimens are small, and much 

 inferior to those fouiul in the Scottish Clyde beds, of which I have a 

 specimen from Rev, H. Crosskey, 



* For shells from this locality I am indebted to Dr, Thornton, of 

 New Riclmiond. 



