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Family Mytilidce. 



Mytilus edulis, L. 



Common everywhere, at or a little above low-water mark. As a Canadian. 

 Pleistocene fossil it has beau found in Lawlor's Lake, near St. John, N.B, ; 

 at Anticosti, Riviere du Loup, Quebec and Montreal, P.Q. ; at Ottawa ; and 

 on the coast of Labrador. 



MODIOLA MODIOLUS (L.). 



Not nearly so common as the preceding species, and found in a little 

 deeper water. Like 31. edulis it is circumpolar and widely distributed on 

 both sides of the North Atlantic and North Pacific. 



In a fossil state, M. modiolus is recorded by Sir J. W. Dawson as being 

 very rare in the Pleistocene deposits of Montreal. 



MoDioLA (Brachydgntes) demissa (Dillwyn). 



Mytilus demissus (Solander) Dillwyn (1817) ; teste Dall. 

 Modiola pUcatula, Lamarck (1835) ; et auct. Amer. 



Minas Basin (G. T. Kennedy, 1875) ; Wallace, Tracadie, Sable Island, 

 Pictou, &c., not scarce (Willis). Prince Edward Island (Sir J. W. Dawson, 

 1871); Charlottetown Harbour (F. Bain, 1875); Shediac (L. M. Lambe, 

 1893); and mouth of the Douglastown River, Gaspe Bay (Bell, 1858). 



Dacrydium vitreum (Moller). 



Modiola? vitrea, Moller (1842). 

 Dacrydium vitreum, Torell (1859) ; et auct. 



Specimens of this species were dredged in the deepest parts of the Gulf of 

 St. Lawrence, in from 100 to 313 fathoms, by the writer in 1871, 1872 and 

 1873 ; also subsequently, in 1877, according to Verrill, olf Nova Scotia, in 

 102 fathoms, by the U. S. Fish Commission 



MODIOLARIA DISCORS (L.) 



Mytilus discors, L. (1767) ; and Stimpson (1851). 

 Mytilus discrcpans, Montagu (1803). 

 Modiola Icevigata, Gray (1824). 

 Modiola discrcpans, Lamarck (1835). 

 Modiolaria discors, Loven (1846) et auct. 



Common on both sides of the north Atlantic, from low- water to 100 

 fathoms, in "nests formed of various marine substances," as Dr. Stimpson 

 observes. In the Bay of Fundy it has been collected by Stimpson and the 

 (J. S. Fish Commission ; in Annapolis Basin by Verkruzen ; on the Atlantic 



