117 



Pecten gibbus, var. borealis, Say, 



Pccten borealis, Say (1822) ; teste Dall. 



Fecten concentricvs, Gould (1841) ; as of Say. 



Fecten irradums, (Lamarck) Stimpson (1851) ; Gould (1870) ; et auct. 



Chlariujs(^Equipecten) irradians, Verrill (18!)7). 



Pccten (Plagwctenium) (jihhus, var. borealis, Dall (1898). 



Specimens of this well known New England species were collected at Sable 

 Island, oif the coast of Nova Scotia, many years ago by Willis, and more 

 recently (in 1899) by Professor Macoun. 



"This is the large, thin, dark-coloured form of the New England coast, 

 ordinarily known as irradians Lamaick. It usually has fewer ribs than the 

 typical irradians, a thinner shell, and more conspicuous concentric lamellfe. 

 It is also rather more compressed. Of seventeen specimens two had sixteen, 

 eleven seventeen, and the remainder eighteen ribs. It may be variegated 

 with orange, gray, dark brown, or olive and white, but, on the whole, 

 constantly averages darker than the southern specimens. It lives in the 

 open bays on weedy or pebbly bottom "* (Dall). Of the typical P. irradians 

 ( = concentrici(s), which he regards also as a variety of P. gibbus, Dall 

 writes ; " This is the southern and typical form of which borealis is the 

 northern geographical race. It extends from New Jersey, which is Say's 

 typical locality, south to Georgia and Texas, f 



Pecten (Placopecten) Magellanicus (Gmelin). 



Ostrea Magellanica, Gmelin (1792) ; and Dilhvyn (1817). 



Ostrea grandis, Solander (1786) ; fide Humphrey (Dall). 



Fecten grandis, Humphrey (1797) ; fide Dall. 



Fecten Magellanicus, Lamarck (1819); ed. Desh., (1834); Gould 



(1841 and 1870) ; et auct. 

 Fecten tcnuicostatus, Mighels and Adams (1841 and 1842) ; et auct. Am, 

 Chlamys (Placopecten) Clintomiis, Verrill, ex parte (1897) ; Dall. 

 Pccten (Placopecten) magellanicus, Dall (1898). 



The large edible scallop of the Maritime Provinces and the Gulf of St. 

 Lawrence, which is said to be especially abundant in Passamaquoddy Bay, 

 and the Bay of Fundy. The most northerly locality at which it has been 

 recorded is on the north shore of the Gulf, just inside of the Strait of Belle 

 Isle, off Caribou Island, P,Q., where Packard says that it is most abundant on 

 a sandy bottom at a fathom depth, the young only being dredged in 1 5 fathoms. 

 In Northumberland Strait, and in Gaspe Bay, it seems also to be most 

 abundant in shallow water near the shore, whereas throughout the Gulf 

 P. Islan.dicus is more common in a little deeper water and on banks at some 

 distance from land. 



* Transactions of the Wagner Free Institute of Science of Philadelphia, vol. in., pp 

 747-748, 



t Idem, p. 748. 



