

UNIVERSITY 



BELA. 



prominent ones on the penultimate and body-whorl ; chestnut to 

 violaceous brown. Length, 8'5-ll mill. 



Cape Cod, Mass., to Greenland; Iceland, 



Norway, Spitzbergen. 



Jeffreys declares the previous species closely allied to this and 

 Leche makes them identical specifically. 



B. violacea, Mighels and Adams (figs. 33, 34), differs from the 

 typical form only in being a little larger and stouter, with the 

 two carinse on the upper whorls less evident ; this is due partly 

 to erosion, partly to age ; the perfect young of the species being 

 typical, the adults or eroded young of the form violacea. The 

 synon3^my includes B. cylindracea, Moller, B. Beckii, Moller, B. 

 livida, Moller (PL 27, fig. 26), B. Grcenlandica, Reeve (PL 27, 

 fig. 18, J), B brevis, Leche, B. ventricosa, Morch, and B. rugu- 

 lata (Moller), Reeve (PL 27, fig. 31). 



B. NOVAJA-SEMLJENSIS, Leche. PL 33, fig. 66. 



Shell yellowish ash-color ; finely and equally decussated by 

 longitudinal and revolving lines ; whorls with a narrow shoulder. 



Length, 8 mill. 



Nova Zembla. 



B. PYRAMIDALIS, Strom. PL 30, fig. 92 ; PL 28, figs. 40, 47 ; PL 



27, fig. 30 ; PL 33, fig. 72 ; PL 34, fig. 81. 



Shell with usually a rather high spire, seven or eight tolerably 

 convex whorls, scarcely or not at all shouldered, ribs 13 to 16, 

 sigmoid, fading out about or above the middle of the body-whorl ; 

 there are numerous, fine, close revolving lines, sometimes not 

 apparent on the ribs ; pale chestnut-color, when fresh. 

 Length, 13 mill. 



Massachusetts to Greenland ; Iceland, Norway, 



Spitzbergen, Nova Zembla. 



Varies considerably in the elevation of the spire and in stout- 

 ness, as well as in the development of the ribs. Prof. Verrill 

 doubts the identity of B. pleurotomaria , Couthouy (PL 30, fig. 

 92) with this species, and considers B. pyramidalis, as figured 

 by Sars (PL 28, fig. 40), at any rate different from pleuroto- 

 maria; but I find all the forms that have been referred to this 

 species by Jeffreys, Leche and others well within the usual 

 varietal limits of similar species. I therefore consider the fol- 

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