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. TT, fig. 88. 



Thin, transparent, polished, with microscopic spiral striae, 

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

 5-6, suture moderate ; umbilicus uoue,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. PI. 77, fig. 89. 



Rather solid, nearl}- opaque, somewhat glossy, with microscopic 

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

 what convex, rapidh* 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 : — 



Tar. CRASSA, Thompson. 



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

 ing elevated ridges. 



Yar. NOT ATA, Jeffreys. 



"Whorls more convex, spiral strife more conspicuous. 

 Yar. ANGUSTA, Jeffreys. 



Thinner and more slender. 



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



Rather thick, semitransparent, glossy, ivory-white ; whorls 

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

 but distinct. Length, 2-5 mill. 



Bay of Biscay, Cape Verd Is., Mediterranean Sea. 



