Of the Vicinity of Montreal. 419 



Mya truncata, Linn. (Fig. Can. Nat. vol. 1.) More abun- 

 dant and larger at Montreal than M. arenaria. Recent American 

 Banks. (Lit. to Cor.) 



Tellina Grcenlandica, Beck. (Fig. Can. Nat. vol. 1.) Very- 

 abundant in Saxicava sand, Montreal, &c. Recent in Arctic 

 Seas, &c. Fossil in British Pleistocene. I suppose it identical 

 with the T. fusca, recent in gulf of St. Lawrence. (Lit. Lam.) 



Tellina calcarea, Lyell. (Fig. Can. Nat. vol. 1.) Probably 

 T. Proxima and sordida of American authors. Less abundant 

 than the preceding species at Montreal, very plentiful at St. 

 Nicholas. Recent Cape Cod and northward. (Cor.) 



Astarte Laurentiana, Lyell. (Fig. Lyell's Elements and Can- 

 Nat, vol. 1.) Common at Montreal in Saxicava sand and less so 

 in Leda clay, supposed to be extinct, but closely alhed to A. 

 Sulcata, recent. 



Cardium Islandicum, Lin. Beauport. (Lyell.) Cape Cod 

 and northward. (Cor.) 



Cardium Groenlandicum, Gould, Beauport. (Lyell.) Cape 

 Cod, &c. (Cor.) 



Leda Portlandica, (L. truncata Wood's Crag. Mol.) Charac- 

 teristic of the Leda clay, Montreal. Rare in Saxicava sand. 

 Fossil in British crag, and recent in Arctic Seas, if identical with 

 L. truncata ; but Dr. Gould after examining a suite of very perfect 

 specimens from Montreal, thinks it distinct from any recent 

 species known to him. 



*Leda pygmaea, Wood, (Fig. 11.) A few small specimens 

 entangled in a delicate sea-weed, in a nodule from Green's Creek 

 in C. G. S., have the form of this or some closely allied species. 



*Leda miyiuta, Gould, (Fig. 12.) Rare at Montreal. Dr. 

 Gould says : " I think our L. tenuisulcata, Couthouy, a different 

 species ; but 1 have a specimen from our northern seas corres- 

 ponding with this fossil, and with one sent by Dr. Loven, from 

 Scandinavia as L. minuta." I suppose this to be the L. caudata 

 of Wood's Crag. Mol. (Cor.) 



Mytilus edulis, Lin. (Fig. 13.) Common at Montreal in 

 Saxicava sand. It differs from the common recent varieties in its 

 obtuse beaks, short rounded hinge line, oval outline, strongly 

 marked and coloured lines of growth, and small size. Fig. 13 is 

 the common form at Montreal. It resembles the var. elegans of 

 Wood's Crag. Mol. Recent north Atlantic. (Lit.) 



*Modiolaria, discors, Lin. (M. discrepans, Montagu.) A single 



