1865.] REVIEW OP THE NORTHERN BUCCINUMS; 373 



The name of this species ought not to be changed on account of 

 its prior use by Pennant, for the B. striatum of this latter author 

 is only a variety of B. undatum. 



Buccinum ciliatum 0. Fabr. 



Tritonium ciliatum Fabr., Fauna Groenlandica (1780), 401. 

 Moerch, in Rink's ' Groenland,' Tillaeg (1857), Aftr. 84. 



Buccinum ciliatum Moeller, in Kroyer's Tidsskrift, iv (1842), 85. 

 Reeve, Conch. Ic, iil (1846), Buc, v, 29. 



Buccinum cyaneum Hancock, An. and Mag. Nat. Hist. [1], xviii (1846), 

 328. (Not of Bruguiere.) 



Buccinum Molleri Reeve, Conch. Ic. iii (1846), Buc, Errata. 



Tritonium (Buccinum) tenebrosum, var. borealis Middendorff, Malac. 

 Rossic. (1849), 162 ; iii, 7, 8. (Not B. tenebrosum of Hancock.) 



Shell rather small and solid, becoming very thick with age, 

 elongated-oval, or sub-elliptical, appressed. Sutures not impressed. 

 Spire short ; body-whorl elongated, and constituting seven-tenths 

 of the length of the shell. Whorls not convex, not carinated, 

 plicated ; longitudinal folds thirteen to eighteen in number, more 

 or less oblique, variable in number and prominence, but never 

 entirely obsolete at the suture. The primary spiral ridges are 

 narrow and distant, about thirty in number on the lower whorl, 

 but are somewhat variable in strength and distance. They are 

 sometimes double or divided in two by a groove. The secondary 

 ridges alternate with the primaries singly or by groups of two, 

 three, or four ; they are only to be distinguished from the primaries 

 by being less prominent, and occupying the depressions constitut- 

 ing the primary grooves. In some specimens the primary and 

 secondary ridges and grooves can scarcely be distinguished from 

 each other. Aperture elliptical, elongated, and narrow, a little 

 more than half the length of the shell, not patulous, but somewhat 

 canaliculated and projecting below ; outer lip scarcely at all 

 sinuated. Columella with a distinct tooth or projection near its 

 anterior or lower extremity. This projection corresponds to the 

 second fold of the columella seen in several other species such as 

 B. tenue and B. undatum, but it is more tooth-like than in any 

 species of the genus, and constitutes an important and easily-re- 

 cognised specific character. Periostraca ciliated. 



Operculum marked on upper surface with regular and prominent 

 lamellae of growth ; nucleus situated at a point half-way between 



