1869.] WHITEAVES — ON DREDGING. 273 



catalogued in my list as A. borealis, Cliemn, on Mr. J. G. 

 Jeffreys' authority. 



Tellina (Angulus) tenera, Say. Off Douglastown. 



Amicula Emersonii, Couth. A living specimen of this species 

 more than an inch long was taken by Principal Dawson off 

 Murray Bay. 



Molleria costulata, Moll., sp. Frequent in Gaspe Bay. 



Rissoa castanea, Moll. Gaspe Bay. 



Scalaria Groenlandica, Perry. One living off St. George's Cove. 



Astyris Holbollii, Beck. Several specimens were taken in 

 Gasp6 Bay. 



Chrysodomus tornatus, Gould, sp. One fine adult specimen 

 was taken alive in 10-15 fathoms off St. George's Cove. 



By dredging in the St. Lawrence opposite Murray Bay, 60 

 species of marine moUusca, identical with well-known Ladrador 

 shells, were obtained by Principal Dawson. It was not pre- 

 viously known that such strictly marine species lived so far up 

 the river. Among the most interesting of these shells is an 

 Astarte which will go far to prove that the A. Laurentiana of 

 Lyell, a well-known Canadian post pliocene fossil, is a local variety 

 of the recent A. Banksii of Leach. Not only, too, are these 

 Murray Bay shells of a very marine type, but in many cases they 

 are of an unusually large size. The force of the tide in the River 

 St. Lawrence is such that it is often difficult, and almost impossible to 

 dredge except in sheltered situations, but the results obtained are 

 very encouraging, and should stimulate to renewed exploration. 

 The observations recently made have shewn that the range in 

 depth of the Canadian marine mollusca is very variable, the 

 same species having been taken living in from 10 up to 50 

 fathoms. We are still, however, profoundly ignorant as to what 

 creatures live at great depths in the Gulf of the St. Lawrence, 

 and there is little doubt that, were the dredge used in the 

 deeper parts of the Gulf and River, most interesting and valuable 

 results would be obtained. My thanks are due to Mr. J. Gwyn 

 Jeffreys for the loan of a dredge of improved construction ; and 

 I am again much indebted to my friends Messrs. John Luce and 

 P. De Cirteret, of Grand Greve, for their kindness and assistance, 

 without which these investigations could not have been carried 

 out. 



