348 ODOSTOMIA. 



Yar. DUBIA, Jeffreys. 



Oval, more solid, body-whorl longer, umbilical chink distinct, 

 tooth stronger. 



Yar. EXILIS, Jeffreys. 



Smaller and more slender; spire elongated, suture slight. 



0. LUKISI, Jeffreys. PI. 77, fig. 97. 



Solid, opaque, glossy, sculpture only very slight, almost 

 microscopical scratch-like longitudinal striae, ivory-white ; whorls 

 5-6, convex, the penultimate a little projecting ; umbilicus small, 

 but distinct ; tooth small and prominent. Length, 2'5 mill. 



Great Britain. 

 0. UNIDENTATA, Mont. PI. 77, figs, 98, 100. 



Solid, almost opaque, glossy, with a more or less distinct 

 peripheral angle, visible also at the base of the upper whorls, sculp- 

 ture slight, microscopical, close-set spiral stride, white ; whorls 6 

 (besides the nucleus), flattened, suture narrow, distinct ; um- 

 bilicus none, although there is sometimes a small chink ; tooth 

 long and prominent. Length, 5 mill. 



Iceland, Europe, West Africa, Canaries, Madeira, Pernambuco. 



0. Monterosati, Bucq. Dautz. et Dollf. (fig. 100), is a young 

 shell of this species according to Dr. Jeffrej's ; who mentions a 

 var. elata, with more elongated spire and narrower base. 



O. TURRITA, Hanley. PI. 77, fig. 99. 



Solid, semitransparent, glossy, microscopically spirally striate, 

 periphery obtusely keeled ; yellowish white or whitish, with a 

 dark border below the suture; whorls 5-6 (besides the nucleus), 

 suture narrow but distinct; umbilicus none; tooth small, not 

 prominent. Length, 3 mill. 



Europe, Teneriffe, Madeira, Pernambuco. 



0. turriculata, Monts. and var. nana, Jeffreys, are enumerated 

 as varieties by Dr. Jeffreys. 



0. ACUTA, Jeffreys. PI. 77, fig. 1. 



Shell rather solid, but semitransparent and lustrous, with 

 microscopic close spiral striae, and still more minute, flexuous, 

 crowded growth-lines, whitish with a tinge of flesh-color ; whorls 



