1865.] REVIEW OF THE NORTHERN BUCCINUMS. 377 



being also very near to the suture. The whorls are pretty sharply 

 contracted below as well as above, so that the siphonal canal at the 

 anterior extremity of the shell projects from the whorl with more 

 than usual abruptness. Periostraca very thin, never ciliated. 



Operculum oval, nucleus close to the outer margin. 



Length, 2.1; breadth, 1.05 inch; from a pleistocene specimen 

 from Hudson's Bay. A recent specimen, from Disco Island mea- 

 sures 2.5 inches in length. 



A young individual from Behring's Straits, No. 1775 of the 

 Smithsonian Collection, varies from the type in form, being some- 

 what appressed, with a much narrower aperture. 



The species is easily distinguished from all others by its nu- 

 merous and frequently interrupted or interpolated plaits, and its 

 minute and crowded but distinct transverse grooves. 



This is a common Greenland species, and is reported from the 

 coasts of Nova Zembla and Lapland by Middendorff. I have 

 before me specimens from Spitzbergen ; from the vicinity of Behr- 

 ing's Straits, collected by the U. S. North Pacific Expedition ; 

 from the north-western coast of Greenland, and from Disco 

 Island, collected by Dr. Hayes ; and from Labrador by Dr. A. S. 

 Packard. As a pleistocene fossil, I have it from the eastern 

 coast of Hudson's Bay collected by Mr. Drexler, from Labrador 

 by Dr. Packard, and from Riviere du Loup, Lower Canada, by 

 Professor Dawson. At the present epoch it is a circumpolar 

 species, rarely if ever found living south of the Arctic circle. 



Buccinum undatum Lin. 



Buccinum undat&n, Lin., Syst. Nat. Ed., x (1758). Forbes & Hani., 

 Brit. Moll.,iii (1853), 401 ; cix, 3-5 andL.L.,fig. 5. Reeve, Conch. Icon. 

 iii (1847), Buc, i, 3. 



Tritonium undatum Mueller, Zool. Dan., ii (1788), 12 ; pi. 1. 



Buccinum striatum Pennant, Brit. Zool., 4th Ed., iv, 121 ; lxxiv, 91. 



Shell large, thick, ovate ; spire of moderate length ; suture not 

 impressed,or, rarely, slightly impressed. Whorls seven, not carinated. 

 Longitudinal folds about fourteen, oblique, sometimes obsolete, but 

 always distinct in young specimens. Primary spiral ridges usually 

 about twenty in number, prominent, rounded, and narrower 

 than the intervening broadly concave primary grooves; — they are 

 generally equidistant in one and the same specimen, except where 

 they become gradually more crowded on the lower part of the lower 



