352 ODOSTOMIA. 



Section Auristomia, Monts., 1884. 



0. BULiMULUS, Brugnone. PI. 77, fig. 14. 



Shell thill, smooth, shining; whorls 6, slightly convex ; aper- 

 ture long and rather narrow, with a plicate tooth above. 



Length, 5 mill. Ilediterranean. 



0. bulimoides, Brugn., is a synonym. 



Unjigiired Species. 



0. Erjaveciana, Brusina (Sj'ns. 0. iurriculata^ Monts., and 



0. retardata^ Tiberi). Ilediterranean. 



0. FUSULUS, Monts. Ilediterranean. 



0. MYOSOTis, Brugnone. Mediterranean. 



Section Pyrgulina, A. Ad., 1863. 



0. DECUSSATA, Mont. PL 77, fig. 7. 



Rather thin, scmitransparent, somewhat glossy, with 20-25 

 flexuous longitudinal ribs and finer, thread-like spiral stria\ 

 whitish ; whorls 4, besides the nucleus, convex, suture deep and 

 channeled ; umbilicus slight, forming a narrow chink ; tooth 

 very retired and inconspicuous, consisting of a narrow oblique 



fold. Length, 3 mill. 



Europe. 

 It is Helix arenaria^ Maton and Rackelt. 



0. EXiMiA, Jeffreys. PI. 77, fig. 8. 



Rather solid, scmitransparent, glossy, with fine curved 

 longitudinal ribs, which do not reach the base, these, or more 

 frequently their interstices are crossed by three spiral stria? or 

 finer ribs on the middle of the bod^^-whorl, giving the shell a 

 partially cancellated appearance, the next whorls have two or 

 tliree similar striae near the base; whorls 4-5, very convex, 

 almost tumid, suture very deep ; umbilicus extremely narrow 

 but distinct; tooth minute, somewhat retired and obscure. 



Length, 1-5 mill. Boreal Europe. 



0. Barleei^ Clark, is a synonym. 



