328 THE GEOLOGY OF THE LABRADOR COAST. 



Mytilus edulis Linn. Fragments of large valves were 

 abundant, but young shells were uncommon. 



Cardiunt Hayesii Stimps. Proc. Acad. Nat. Sc. 

 Philad. p. 581, 1862. This species occurred both at 

 Hopedale and Caribou Island. 



Serripes gronlandicus (Chemn.) Beck. Caribou 

 Island, frequent. Chateau Bay. 



Astarte Banksii Leach, Zool. Beechy's Voyage. {A. 

 Warhami Hancock, Ann. Mag. Nat. Hist, vol. xviii., 

 1846, p. 336, pi. v., figs. 15, 16. A. Richardsoni Reeve, 

 Last of the Arctic Voyagers, ii. App. A. fabula Reeve, 

 1. c. ; A. Laurentiana Lyell ; A. compressa Daws., — not 

 of European authors.) A fine series of specimens, re- 

 cent and fossil, from Labrador, and fossil frofn Maine 

 and the river St. Lawrence, has convinced me that the 

 numerous variations of form which this species assumes 

 are of local origin, arising from differences in habitat or 

 age. Among a number oiA. Laurentiana Lyell, received 

 from Montreal through the kindness of Dr. Dawson, are 

 some thinner and more finely striated than usual, but I 

 have recent specimens and also fossils from Labrador 

 agreeing with them. The species varies in the length of 

 the shell and the form of the posterior end, but the shape 

 of the anterior end, the sulci and the hinge characters are 

 in all the varieties very constant, 



Very elongated forms are like A. Wai^hami Hancock, 

 which we would consider as a synonym of this species. 

 The varieties A. Richardsoni and A. fabula have oc- 

 curred in the same locality, at Dumplin Harbor at 

 the mouth of Sandwich Bay, Labrador, where I have 

 dredged them alive. 



Astarte striata Gray. One specimen from Hopedale. 



