2;U THK ICK A(il>: IN CANADA. 



I am not awaro wliei'e tliis littlo slicll lias l)oc'n (le.sui'il»c<l, nor what 

 is its ranj^ii. It seoni.s idcutical witli a spuciinen in .JutTrfy's collection 

 labelled Tif/inti /r(ii/i'!'<, Leach, from Spitzhcrgen. The I'leistocenc 

 specimens are larger ami better developed than the recent, except some 

 dredged by Mr. Wiiiteaves on the north sliore, and I would infer from 

 this tliat the shell is Arctic. 



Cyrtoddrid .fi/iqiiu. I)aiiilin. 



Fossil — Riviere-dn-Loui); L-.il)rador (Packard); (Ireenland (Milller). 

 I have seen in tlie Post-pliocene of Canada, only an imperfect and 

 decorticated s[)ecimen of the young shell from Ri\iri'c-(lu-I^oiip. 



Recent — Little Metis ; Cape Breton ; Prince Kdward Island ; 

 (Jaspe ; (iulf of St. Lawrence ; and coasts of No\a Scotia and New 

 P]ngland. 



Madrii (Sphuhi) ord/is. (ionld. M. jiohjmmd. Stimpson. 



Fossil — Boulder clay ; Cape Kli/abeth, Maine. 



Recent — Little Metis; <iaspr'; Labrador (I'ackard) ; also coast of 

 Now England. 



I foun(L many years ago, a few specimens of this shell at a cove 

 where a number of si)ecies of marine shells occur in boulder-clay, and 

 it was published in my list of shells from this place in my paper on tiie 

 Post-pliocene of Labrador, Maine, itc. It is credited hy Packard ti> 

 " Zeeb's Cove," Cape Klizal)eth, which may probably be the same place 

 where I procured it. 'I'liis species has not yet been found within the 

 limits of Canada in the Pleistocene, though this and the related 

 species or variety, M. dolidi.^sinin, is found living in Labrador, and 

 Matthew records it from upper Leda clay, .St John. It has perhaps 

 moved northward since the glacial period. 



Mesodcama (Ctronhi) dtditnitd. Turton. 



Fossil — Matane River (Bell) ; Little Metis. 1 have not seen it in 

 any other localitj' ; and it occurs only on the lowest terrace, .so that 

 possibly it is modern. 



Recent— Abmulant at Tadoussac ; Little Metis ; and elsewhere in 

 (Julf and River .St. Lawrence; Labrador (I'ackard). 



This must be a modern species on f)ur coasts ; but according to 

 Wood it is found in the Red Crag of Kntrland. 



Venericnrdia (Cardila) homdh. Conrad. 



Fossil — Labrador (Packard). 



Recent — Arctic seas to Long Island ; Little Metis, and common 

 throughout the (iulf of St. Lawrence. It woultl seem to have been 



