THE MOUNT DESERT REGION 183 



MuscuLUS Bolten 



M. suBSTRiATUs (Gray). {Modiolaria laevigata var. sub- 

 striata Gray, 1824, Parry's Voyage ; Modiolaria discors Gould, 

 1870, Inv. Mass., p. 192, fig. 489.) Lives on hard bottom and 

 on branches of seaweed of various kinds, which its small size 

 permits. A common species. Stations : D 37, 68, 70, 104. 

 Abundant just inside Mount Desert Rock. Reported from 

 Eastport to New Haven. Circumpolar; a Canadian Pleisto- 

 cene fossil ; reported north to Hudson Strait. 



M. NIGRA (Gray). (Modiolaria nigra Gray, 1824, Parry's 

 Voyage [Northwest Passage] ; Modiolaria nexa Gould, 1841, 

 Inv. Mass.; M. nigra Gould, 1870, Inv. Mass., p. 190, figs. 

 487-488.) An inhabitant of muddy bottom, but rather scarce. 

 Stations : D 62, 63, 77 ; S 35. Reported by Woods Hole Sur- 

 vey. Fossil at Kennebeck, Me. ; Bay of Fundy, Hudson Strait. 



M. coRRUGATus (Stimpsou). (Stimpson, 1851, Shells of 

 N. E. ; Modiolaria corrugata Gould, 1870, Inv. Mass., p. 193, 

 fig. 491.) As with the previous species, this one is scarce, but 

 is found on hard bottoms. Stations: D 38, 103, 117. Re- 

 ported from Casco Bay, Marthas Vineyard, 20 to 25 fathoms ; 

 Georges Bank, off New London. Circumpolar ; north to Hud- 

 son Strait ; in Canadian Pleistocene. 



Crenella Brown 



C. GLANDULA (Tottcu), (Modiolariu glandula Gould, 1870, 

 Inv. Mass., p. 194, fig. 492.) Abundant on muddy bottoms, if 

 not too soft, from the inner Bay to Mount Desert Rock. Sta- 

 tions: D 27, 33, 34, 46, 51, 53, 54, 61, 62, 66, 68, 80, 100. Re- 

 ported from Eastport to New London at various places; from 

 Passamaquoddy Bay at various points to Atlantic coast of 

 Labrador. 



C. DECussATA (Montagu). {Mytilus decussatus Montagu, 

 1803, Test. Brit. Suppl.; C. decussata Verrill, 1882, Trans. 

 Conn. Acad., vol. 5, p. 578, pi. 44, fig. 7.) Abundant on muddy 

 bottoms, occurring with the previous species. Stations : D 33, 

 46, 61, 62. Reported from Eastport to Stonington, 4 to 115 

 fathoms ; Annapolis Basin, Gaspe Bay, Greenland. 



