346 ODOSTOMIA. 



Genus ODOSTOMIA, Fleming, 1828. 



I. European. 

 The sections are only used for the European species. 



Section ODOSTOMIA, sensu stricto. 



0. PLTCATA, Mont. PI. 77, fig. 88. 



Thin, transparent, polished, with microscopic spiral stride, 

 very pale yellowish white or white, darker at the suture ; whorls 

 5-6, suture moderate ; umbilicus none, or a narrow chink in full- 

 grown specimens ; columellar tooth small, but distinct. 



Length, 2*5 mill. 



Europe. 



It is 0. elongata, Phil., 0. bulimoides, Scacchi. 



0. PALLIDA, Mont. PL 77, fig. 89. 



Rather solid, nearly opaque, somewhat gloss}^ with microscopic 

 spiral striae, milk-white or yellowish white; whorls 6-7, some- 

 what convex, rapidly enlarging, suture moderate, distinct ; um- 

 bilical chink very narrow or none ; tooth strong. 



Length, 5 mill. 



Europe. 



0. Novegradensis, Brusina, 0. Eulimoides, Hanley (figured), 

 are synonyms. Jeffreys cites : 



Yar. CRASSA, Thompson. 



Smaller and thicker; some of the spiral stria? confluent, form- 

 ing elevated ridges. 



Yar. NOTATA, Jeffreys. 



Whorls more convex, spiral striae more conspicuous. 

 Yar. ANGUSTA, Jeffreys. 



Thinner and more slender. 



0. SUBLONGA, Jeffreys. PI. 77, fig. 90. 



Rather thick, semitransparent, glossy, ivorj'-white ; whorls 

 4-5, the last obsoletely angulated on the periphery ; tooth minute, 

 but distinct. Length, 2'5 mill. 



Bay of Biscay, Cape Verd /s., Mediterranean Sea. 



