270 THE ICE AGE IN CANADA. 



Greenland Mollusca under the name " Nicania Banksii, Sab." Reeve's 

 publication was in 1855. Sowerby's figure, although it represents the 

 shape, does not show the peculiar sculpture of A. fdbula. See also 

 A. Crebricostata (Forbes) and A. Hkhardsonii. Reeve. 



lellina calcarea. Chemn. 



Tellina calcarea. Chemn., VI., p. 140, tab. 13, fig. 136. For the 

 synonymy and range of this common Arctic shell and "glacial " fossil, 

 see "British Conchology," Vol. II., pp. 389, 390, and Vol. V., p. 187. 



Thracia dbliqua. Jeflfr. , sp. n. 



A valve measuring an inch and six-tenths in breadth by an inch and 

 one-tenth in length. It is distinguishable from Thracia (Amphidesma) 

 truncata of Brown, = 2. myopsis (Beck), in having a more oblique or 

 twisted shape, a straight instead of rounded margin in front, and a 

 more gradual or less abrupt slope to each side ; the truncature at the 

 posterior side is broad and regularly curved ; and the surface is 

 puckered, as in Mya truncata. It wants the flexuosity of T. pubescens, 

 but resembles in its outline that species more than T. truncata. T, 

 septentrionalis, Jeffr. [truncata of Mighels and Adams), differs in shape 

 and texture from all the above-named species. Having, however, seen 

 but a single valve, I will not insist on this constituting a new species. 



Mya truncata, L., (var. Uddevallensis). 

 Saxicava 7'ugosa. L. 

 Neaera suhtorta. Sars. 



Solenoconchia. 

 Siphodentalium vitreum. 



Gastropoda. 



Trochus [Margarita) umbilicalis. Brod. and I^ow. 



Trichotropis borealis. Brod. and Low. 



Buccinum tenue. 



Buccmum hydrophanum. Hancock. 



Trophon clathratiLS. L. 



Pleurotoma tenuicostata. Say. 



P. Exarata. Moller. 



P. Trevelyana. Fischer. 



Cylichna alba. Brown. 



Actinozoa. 

 FimicuUna quadrangtdaris. 



Mr. Norman has examined these organisms, and favoured me with 

 the following memorandum : — 



