125 



Fossil in the Leda clay of Portland and Saco, Maine ; of Lawlor's Lake, 

 near St. John, N.B. ; and of New Richmond, and Riviere du Loup, P.Q. 



Leda pernula, var. jacksonii. 



Nucula Jacksonii, Gould (1841). 



Leda buccata (Steenstrup) Mciller (1842) ; fide Stimpson. 



Leda Jacksonii, Gould (1870). 



North shore of the Gulf of St. Lawrence, off Caribou Island, just inside 

 of the Strait of Belle Isle, abundant ; Labrador coast, at Long Island and 

 Henley Harbour, in 15 to 20 fathoms, (Packard) ; Henley Harbour and 

 Temple Bay in 10 to 15 fathoms, Stearns expedition (Miss Bush). A shorter 

 and more tumid shell than the typical L. pernula, with the cardinal margin 

 eroded in such a manner as to " show the origin of the hinge denticles." 



Leda tenuisulcata (Couthouy). 



Ifucula tenuisulcata, Couthouy (1838). 



Nucula minuta, Gould (1841). 



Li'da tenuisulcata, Hanley (1860) ; Gould (1870) ; et auct. 



Grand Manan, " common on muddy bottoms " (Stimpson) ; Bay of Fundy, 

 common in 6 to 80 fathoms (Verrill) ; Passamaquoddy Bay (Ganong) ; 

 fishing banks off Halifax, rare (Willis). Gulf of St. Lawrence, off Cap des 

 Rosiers, in 110 fathoms coarse sand, with stones, dredged by the writer. 

 Perhaps a slender, compressed variety of L. pernula, with the beaks placed 

 rather near to the anterior end. 



YOLDIA LIMATULA (Say). 



Nucula liraatula, Say (1831). 



Leda limatula, Stimpson (1851). 



Yoldia liviatula, H. & A. Adams (1858). 



Grand Manan in 6 fathoms mud (Stimpson) ; Bay of Fundy, 4 to 30 

 fathoms (Verrill) ; fishing banks off Halifax, rare (AVillis). Very common 

 throughout Northumberland Strait, but rare in the northern part of the 

 Gulf of St. Lawrence (Whiteaves) ; Little Metis (Sir J. W. Dawson). Fossil 

 in the Leda clay at Riviere du Loup (Sir J. W. Dawson). 



Yoldia sapotilla (Gould). 



Nucula sapotilla, Gould (1841). 

 Leda ( Yoldia) sapotilla, Stimpson (1851). 



Yoldia sapotilla, H. & A. Adams (1858) ; Packard (1861) ; and 

 Gould (1870). 



Grand Manan, " 10 fathoms, Welch Pool " (Stimpson) ; common in Casco 

 Bay and the Bay of Fundy, 4 to 100 fathoms, mud (Verrill) ; fishing banks 



