386 THE CANADIAN NATURALIST. [Oct. 



of the longitudinal plications of the spire- whorls, the more numer- 

 ous and sharply-cut transverse ridges, and the wider mouth. From 

 B. cillatum it differs very much, both in shape, and in the want 

 of a tooth-like fold on the columella. 



Buccinum Humphreysianum Bennett. 



Buccinum Humphreysianum Bennett, Zool. Journ., London, i (1825), 

 398, pi. xxii, upper figures. Forbes and Hanley, Brit. Moll., iii, 410 ; pi. ex, 1. 



Buccinum ventricosum Kiener, Iconography, Buc. (1841) 4, pi. iii. 7, 

 (not of Lam.) 



Buccinum ciliatum Gould, Inv. Mass. (1841), 30*7 ; fig. 209. Reeve, 

 Conch. Icon, iii (1346), Buc. i. 1 (not of 0. Fabr.) 



Tritonium (Buccinum) Humphreysianum Middendorff, Malac. Rossic. 

 (1849), 163 (syn. partim excl.) 



Tritonium Humphreysianum ? Moerch, in Rink's ' Groenland ' Tiling, 

 (1857) Aftr. 84. 



Shell rather below the medium size, very thin, translucent, pale, 

 brownish, with fulvous or reddish markings sometimes obsolete. 

 Spire conic ; whorls 7, somewhat flattened above and regularly 

 convex below, so as to be faintly shouldered above the middle. 

 They are neither plicated, carinated nor angulated, and the sur- 

 face is much smoother than in most species of the genus. The 

 transverse striation is of the same type as that seen in B. unda- 

 tum, etc.. but far less prominent. The primary ridges are to be 

 distinguished from the secondaries only at the obsolete angle or 

 shoulder of the whorl, where there are generally two or three small 

 ridges on each side of the more prominent ones and the corre- 

 sponding sulcus. On the middle and lower part of the body- whorl, 

 where the transverse ridges are for the most part equal in size and 

 strength, and equal to the intervening grooves, the grooves are 

 crossed by well-marked though microscopic lines of growth. 



The aperture is almost one-half the length of the shell, and 

 about three-fifths as broad as long. The outer lip is very little 

 thickened and scarcely at all projecting below, and it has no sinus 

 at the middle. Columella like that of B. undulatum. Perios- 

 traca ciliated. 



The dimensions of a specimen from the Newfoundland banks 

 are, length, 1.45 ; breadth, 0.82 inches. 



This species is reported from the seas of Ireland, by Bennett ; 

 Zetland, by Forbes and Hanley ; Lapland, by Middendorff; Green- 

 land, with a query, by Moerch ; Newfoundland banks, by Gould ; 



