224 BELOMITRA, LACHESIS. 



B. RUFA, Montagu. PL 32, fig. 35. 



Whorls seven, rather convex, very slightly shouldered ; ribs 

 14 or 15, narrower than the interstices ; surface covered with fine 

 close revolving striae ; chocolate-brown, the ribs lighter colored. 



Length, 13 mill. 



Europe. 



The synonymy is enormous, including B. Kieneri, Marav., B. 

 chordula, Turton (juv.), B. nigra, Potiez et Mich., B. fusca, B. 

 discors, B. castanea and B. discrepant of Brown, and perhaps 

 also B. alba and B. minima of the same author. 



Jefftxrys distinguishes the following varieties : 

 Var. LACTEA. Shell white. 



Tar. SEMICOSTATA. Lower whorls ribless ; shell often larger. 

 Var. UHLIDEANA, Thompson. Shell orange-brown or fawn-color, 



with stronger sculpture. 

 Var. CRANCHII, Brown. Ribs twisted. 



Var. ANGUSTA. Shell narrower, and slender, with sharp and 

 oblique ribs. 



Subgenus BELOMITRA, Fischer, 1882. 

 B. PARADOXA. Fischer. 



Shell elongatel} 7 fusiform, whitish, whorls eight, the embryonal 

 obtuse, mammillate, the others slightly convex, angulately cari- 

 nated in the middle, with about twelve subarcuate longitudinal 

 ribs, which become evanescent below the middle of the body- 

 whorl, and revolving striae ; aperture oblong, narrow ; lip obso- 

 letely sinuous behind, smooth within ; columella nearly vertical 

 with six or seven oblique narrow plications ; canal short. 



L. 28, diam. 9 ; L. apert. 14 mill. 



Atlantic, 627 metres. 



Locality not given. Unfigured. 



Genus LACHESIS, Risso, 1826. 



L. MINIMA, Montagu. PI. 32, figs. 21, 24 ; PI. 27, fig. 4. 



Shell solid, opaque, rather glossy ; ribs nine or ten, crossed by 

 fifteen to twenty broad, flattened spiral ridges on the body-whorl, 

 four on the spire whorls; apex globular, twisted on one side; 

 whorls five to six, rather convex ; outer lip varicose without, 



