50 THE CANADIAN NATURALIST. [March 



3Iodiolar!a discors Linn, and var. Uevigata Gray : — Rare, 

 living witli the above. 



Modiolaria nigra Gray : — One fine living specimen on a stone, 

 in about 20 fathoms. 



Modioli modiolus Linn. — Fragments of large specimeas in 

 shingle at 20 fathoms. 



Mytilus edidis Linn. — Common on the beach and in shallow 

 water. 



Cardiiim Islandicum Linn. — In sandy mud, at 30 to 50 

 fathoms, and abundantly from fishes' stomachs. 



Cardium piiundatimi Conrad : — Alive, with the preceding. 



Serripcs Groenhindicus Chemn. — Large and fine, in mud, at 

 20 to 50 fathoms. Found in the English Red-Crag deposits. 



Astarte striata Leach, and var. gJohosa : — In 20 to 60 

 fathoms mud. 



Astarte Banhsii Leach : — "With the preceding, but rarer. This 

 species and the foregoing are barely specifically distinct from the 

 A. compressa of English authors. They exactly correspond with 

 the two so-called species from Greenland. 



Astarte undata Gould (= A. latisidca Hanley) : — Large and 

 fine, in 50 to 60 fathoms mud. Very variable in sculpture. 

 The New England variety, with prominent and distant ribs, 

 which some of the Gaspe examples approach, can hardly be 

 separated from the Astarte Onudii var. undulata of Searles' 

 Wood's Crag Mollusca. 



Astarte semisulcata Leach : — With the preceding a few speci- 

 mens occurred, which I refer, with doubt, to this species. 



Cardita horealis Conrad : — Living, at various depths. 



Axinus Gouldii Philippi : — A few living, at 20 to 60 fathoms. 



Venus fiuctuosa Gould, sp. — Extremely abundant, living in 

 20 to 50 fathoms. 



Ma'Mma s ibulosa Spengler (= Tdlina proxiriia and calcarca, 

 auct.) : — Scarce, in 20 to 50 ftithoms ; also from stomachs of fishes. 



Macoma Groenlandiai Beck, sp. — Scarce, in shallow water. 

 Probably conspecific with the Sanguinolaria fusca of Say from 

 New England, with the West Coast Macoma inconspicua of 

 Brod. et Sow, and with the European Tdlina Balthica of 

 Linnaeus. 



Mya arenaria Linn. — Occasional, on the shore. 

 Mya truncata Linn. — One dead but fresh adult, and living 

 fry taken in 10 to 20 fathoms. 



