718 
Exemplar hat beinahe die Grösse des Sp. y akushimanum, das mir noch unbekannt 
geblieben 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 Pilshry’s Beschreibung annehmen sollte, und einen deutlich doppelten 
Mundsaum. 
5. Spiropoma yakushimanurn Pilsbry. 
Testa latissime umbilicata, depressa, solida, lutescenti-olivacea, in anfractu ultimo fus- 
cescens, supra plerumque detrita, stviatula vestigiisque linearum spiralium sculpta, nitida. 
Anfractus 4V 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, diam. 4,7 mm. — Forma minor: diam. 
11,5, alt. 6,3 mm. 
Spiropoma yak ushimanum, 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 1 /, 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 l / s 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- 
