122 



(Bell); Mingan Islands (J. Richardson) ; Murray Bay, abundant (Sir J. W. 

 Dawson). Professor Verrill regards C. pextinula as synonymous with C. 

 fah'j, but this opinion is not shared by Dr. Dall, who, in a letter to the 

 writer, dated February 18, 1901, writes as follows. '^ Crenella pectinula, of 

 which I have one of Gould's types, I regard as perfectly distinct from C. Jaha. 

 " G. pectinula is light yellow brown, with coarser sculpture and more rotund 

 form than the purple C. faha. But C. pectinula appears to be very rare and 

 I have seen only the types, while C. faha is common in the Arctic." 



Crenella glandula (Totten). 



Modiola glandula, Totten (1834). 



Mittilus decussatus, Stimpson (1851) ; non Montagu. 



Crenella glandula, H. and A. Adams (1858) ; and Gould (1870). 



Bay of Fundy (Stimpson, — and Verrill) ; Passamaquoddy Bay, N. B. 

 (Ganong) ; Annapolis Basin (Verkruzen) ; Gulf and mouth of the River St. 

 Lawrence at many localities, (collected by Bell, Sir. J.W. Dawson, Packard, 

 and the writer) ; and Atlantic coast of Labrador, off Square Island, low-water 

 to 60 fathoms '(Packard). 



Crenella decussata (Montagu). 



Mytilus decussatus, Montagu (1808). 

 Modiola? cicercula, Moller (1842). 

 Crenella decussata, Loven (1846) ; et auct. 



Bay of Fundy, common (Verrill) ; Annapolis Basin (Verkruzen) ; off 

 Grande Greve, Gaspe Bay, and other localities in the Gulf of St. Lawrence, 

 in from 20 to 60 fathoms, dredged by the writer ; Greenland (Moller). 



Fapaily Nuculidoe. 

 NucuLA TENUIS (Montagu). 



a. Forma typica. 



Area tenuis, Montagu (1808). 



Nucula tenuis, Turton (1822) ; et auct. 



Nucula tenuis, forma typica, G. O. Sars (1878). 



b. Forma ini^lata. 



Nucida tenuis, Moller (1842). 

 Nucula injiata, Hancock (1846). 

 • Nucula ohliquata, Beck (1847) ; teste Morch. 

 Nucula tenuis, forma injiata, G. O. Sars (1878). 



Both varieties of this shell are widely distributed on the European as 

 well as on the American side of the north Atlantic, in from 4 to 100 



