ODOSTOMIA. 349 



6, besides the embryonic ones, periphery obtuselj^ keeled ; umbil- 

 icus conspicuous though small ; tooth strong and prominent. 



Europe, Canary /s., Teneriffe. 

 The outer lip is occasionally striate within. 



Yar. UMBiLTCATA, xilder. 



Larger, stronger, white, with a broad base and usually wider 

 and deeper umbilicus ; peiipheral keel obscure. 



0. ALBELLA, LOVCII. PI. Tt, fig. 3. 



Thin, semitransparent, dull yellowish white ; whorls 5-C, suture 

 narrow, incised, narrowly banded below; imperforate, or some- 

 times a narrow chink; tooth small, retired, nearly hidden behind 

 the pillar. Length, 2'75 mill. 



Europe. 

 0. SULCIFERA, Smith. PI. 77, fig. 4. 



White, polished ; W'horls 5, subplane, indistinctly longitudi- 

 nally striate, with a sutural pellucid zone, and a linear sulcus on 

 the periphery ; columella lightly' dentate. Length, 5 mill. 



WJrydah, West Africa. 



0. FALLAX, Monts. (Unfigured). Medilerranean. 



Section Megastomia, Monts., 1884. 



0. coNSPicuA, Alder. PI. 77, fig. 5. 



Shell solid, opaque, glossy, with microscopic spiral and longi- 

 tudinal striae; pale cream color, varying to chocolate, and 

 more or less stained with madder ; w'horls 8 (besides 2 embryonic), 

 peripher}- obtusel^^ angulated, the angle showing at the base of 

 the spire whorls; umbilicus extremely small, almost covered; 

 tooth strong, conspicuous, outer lip. grooved within. 



Length, S-75 mill. 



Europe. 

 0. CONOIDEA, Brocchi. PL 77, fig. 6. 



Solid, white, polished, with microscopic growth-lines, periphery 

 more or less distinctly keeled or angulated, with an impressed 

 spiral line ; whorls 8, nearl}' flat ; umbilicus small, deep ; tooth 



