128 



Family Arcidce. 

 Arca (Bathyarca) pectunculoides, Scacchi. 



Area pectunculoides, Scacchi (1834) ; fide Nyst. 

 Arca raridentata, Searles Wood (1840). 

 Bathyarca pectunculoides, Verrill and Bush (1898). 



Living ia deep water (200 to 313 fathoms) in the Gulf of St. Lawrence, 

 to the north, south and south-east of the Island of Anticosti, where speci- 

 mens of it were dredged by the writer in 1871, 1872 and 1873. 



According to Verrill this species has been taken by dredging parties of the 

 U. S. Fish Commission, since 1872, in the Bay of Fundy, 108 fathoms ; on 

 Georges and Le Have Banks, and off Halifax, Nova Scotia, at various depths, 

 from 70 to 430 fathoms. 



Aeca (Bathyarca) ulacialis, Gray. 



Area glaeialis, Gray (1824) ; et auct. 

 Bathyarca glaeialis, Verrill and Bush (1898). 



"This species has been recorded from the Gulf of St. Lawrence by 

 Jeffreys " (Vei-rill). 



Familv Cardiidce. 

 Cardium (Cerastoderma) ciliatum, Fabricius, 



Cardiurii ciliatuni, O. Fabricius (1780). 



Cardium Islandicum, Chemnitz (1782) ; Spengler (1808) ; et auct. 



Cardium (Cerastoderma) ciliatum, Dall (1900). 



Common, at moderate depths, throughout the whole of the region under 

 consideration. It is the large fringe-ribbed cockle of the Gulf of St. Law- 

 rence, and both it and Serripes Greenlandicus form an important part of the 

 food of the halibut and cod. Both, also, are known to inhabit the coast of 

 Labrador, Hudson Bay and Greenland, and to extend their range south- 

 ward to Cap Cod. 



In a fossil state C. ciliatum has been found in the Pleistocene deposits of 

 Portland, Me. ; of Lawlor's Lake, near St. John, N.B. ; of Little Metis, 

 Riviere du Loup, the Saguenay and Murray Bay, P.Q. ; also of two or three 

 miles up Whale River, Hudson Bay (Bell, 1877); of near Moose Factory, 

 James Bay (Bell, 1875, and A. S. Cochrane, 1877); of the Limestone rapids 

 of the Fawn Branch of the Severn River, Keewatin (A. P. Low, 1886); 

 and of Vancouver Island, B.C. 



