HELIX. 47 



suture linear; whorls 8, flattened, the last acutely angulated, base 

 scarcely more convex, rounded in front, subgibbous, ochre color, 

 suddenly deflected; peristome Avhite, with an interior callus, basally 

 subreflected, margins joined by a parietal callus. 

 Diam. 12 mill. 



Ins. Porto Sancto. 



Section IX. ACUSTA, Albers. 1860. 



H. SKLSKII, Gerstfeldt. PI. 10, figs. 5-7. 



Very narrowly perforate, almost covered, thin, transparent, 

 closely striate, a little shining, yellowish, three-banded with chest- 

 nut; whorls 5, rapidly increasing, the last ventricose, scarcely 

 deflected in front; peristome acute. Diam. 20 mill. 



Amur River, E. Siberia. 



H. CINCTO-INFLATA, Mousson. PI. 10, fig. 8. 



Perforate, thin, pellucid, not shining, irregularly striate, decuss- 

 ated by minute lines, light brownish, with a dorsal narrow chestnut 

 band, suture scarcely impressed ; whorls 5 J, rapidly increasing, 

 somewhat convex, the last inflated, and subgranular on the base ; 

 peristome acute, thin. Diam. 32 mill. 



Amur River, E. Siberia. 



H. LAETA, Gould. PI. 10, figs. 13, 14. 



Thin, shining, striate, with very thin spiral lines, greenish cor- 

 neous, with a brown band on the periphery and another near the 

 suture; whorls 5, ventricose; peristome acute, a little expanded, 

 reflected at the umbilicus. Diam. 31 mill. 



Hakodadij Japan. 



H. SlEBOLDTIANA, Pfr. PL 10, fig. 9. 



Scarcely perforate, thin, pellucid, striulate and very obsoletely 

 subdecussated, corneous ; whorls 51, somewhat convex, the last ventri- 

 cose; peristome simple, acute. Diam. 18 mill. 



Japan, Formosa. 



Is possibly a variety of H. ravida, Bens. 



H. OSCITANS, Martens. PL 10, figs. 10-12. 



Rimately perforate, slightly striulate, granular hairy, yellowish 

 brown, suture impressed; whorls 4?, convex, the last a little des- 

 cending, rounded; peristome simple, acute. Diam. 18 mill. 



Japan. 



