THE MOUNT DESERT REGION 179 



PELECYPODA (Lamellibranchiata) 

 PRIONODESACEA 



Nuculidae 

 NucuLA Lamarck 



N. PRoxiMA (Say). (Gould, 1870, Inv. Mass., p. 150, fig. 458 ; 

 {Nucula proxima truncula Dall, 1898, Trans. Wagner Free 

 Inst. Sci.) Found abundantly everywhere on muddy bot- 

 toms and is one of the leading foods for fish. Probably, in 

 point of numbers, the commonest form of the Region. Par- 

 ticularly plentiful in the inner Bay. Stations : D 1, 32, 33, 

 36-39, 45, 46, 51, 53-55, 58, 61, 70, 72, 81, 83, 115, 120. Com- 

 mon from Maine to Connecticut in 2 to 30 fathoms. Grand 

 Manan, Bay of Fundy, Annapolis Basin abundant, Halifax 

 fishing banks rare. 



N. TENUIS (Montagu). {Area tenuis Montagu, 1808, Test. 

 Brit. Suppl.; Gould, 1870, Inv. Mass., p. 149, fig. 457.) Com- 

 mon inside the Porcupine Islands and occurring with the other 

 two species on muddy bottoms. Reported from Eastport, 

 Casco Bay, Saco, Me.; Pleistocene. Circumpolar in from 4 

 to 100 fathoms. North to Arctic Ocean. 



N. DELPHiNODONTA Mighcls and Adams, 1842, Boston Jour. 

 Nat. Hist. (Gould, 1870, Inv. Mass., p. 153, fig. 461.) Com- 

 mon with the preceding two species and, as with them, one of 

 the chief foods of haddock. Station : D 65. Woods Hole 

 Survey, Eastport, 10 to 100 fathoms; Casco Bay, off Cape 

 Ann, East of Block Island, Grand Manan, 25 fathoms ; Halifax 

 banks, Gaspe Bay, in 50 fathoms mud. 



Ledidae 

 Leda Schumacher 

 L. tenuisulcata (Couthouy). (Couthouy, 1838, Boston 

 Jour. Nat. Hist.; Gould, 1870, Inv. Mass., p. 161, fig. 468.) 

 Widely distributed in small numbers throughout the outer 

 Bay and off Northeast Harbor. Serves as a fish food. Sta- 

 tions : D 27, 36, 38, 94-96, 99, 105, 106. Reported from East- 

 port, Casco Bay, Isle of Shoals, Newport, from fish caught 



