718 



Exemplar hat beinahe die Grösse des Sp. yakushimanum, das mir noch unbekannt 

 gebUeben ist, und einen sehr viel mehr ausgeschnittenen Spindelrand, von den beiden 

 anderen hat das eine nur knapp 10 mm im grossen Durchmesser. Ueber den Unter- 

 schied von Spirostoma japonicum sagt Pilsbry: „In the larger Sp. japonicum the 

 last whorl descends much less in front; the peristome expanded and not so much 

 if at all built forward." — Alle drei Exemplare haben ein höheres Gewinde, als 

 man nach Pilsbry's Beschreibung annehmen sollte, und einen deutlich doppelten 

 Mundsaum. 



5. Spiropoma yakushimanum Pilsbry. 



Testa latissime umbilicata, depressa, solida, lutescenti-olivacea, in anfractu ultimo fus- 

 cescens, supra plerumque detrita, striatula vestigiisque linearum spiralium sculpta, nitida. 

 Anfractus 41/2 convexi, apicalis leviter prominulus^ ultimus teres, basi valde convexus, antice 

 profunde descendens. Apertura obliqua, ovalis, altior quam lata; peristoma contractum, intus 

 incrassatum et leviter protractum, obtusum, album, ad insertionem leviter incrassatum^ plerum- 

 que sinuatum, marginibus callo crasso stricto fere continuis, columellari conspicue recedente. 

 — Pilsbry angl. 



Diam. 12,5, alt. 7,3, alt. apert. cum perist. 5,3, diara. 4,7 mm. — Forma minor: diam. 

 11,5, alt. 6,3 mm. 



Spiropoma yakushimanum, Pilsbry, in: Pr. Acad. Philadelphia, 1908 p. 32. 



„The Shell is depressed!, very openly umbilicate, solid, yellowisch-olivaceus, 

 somewhat brownish on the last whorl, the cuticle much paler, or usually wanting on 

 the inner whorls. Surface glossy where unworn, marked with growth-lines and very 

 indistinct traces of spiral Striae. Whorls fully 4^/^ quite convex, the first one pro- 

 jecting a little; last whorl tubulär, very convex at the base, deeply descending in 

 front. Aperture oblique, longer than wide. Peristome contracted, being thickened 

 in the posterior angle, but usually has a small notch there. The columellar margin 

 recedes rather conspicuously. The short parietal margin is thick and straight. The 

 perculum is conic, composed of 7^/j flat whorls separated by a narrow ledge with 

 raised outer edge, producing a narrow spiral Channel along the suture ; summit 

 obtuse." 



Yaku-shima, Osumi, Japan. 



Von Sp. japonicum unterschieden durch die stärker herabsteigende letzte Win^ 



