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in one direction ; umbilicus rather large, pervious, its wall nearly smooth, it is partly covered 

 by the columellar margin. Aperture rhombic, upper margin convex, thin, with a broad callosity 

 interiorly; basal margin convex, thick; columella thickened, curved, with a knob at some 

 distance from the base, expanded at its upper part, and partly covering the umbilicus; margins 

 connected by a callous layer; columella joining the base by a blunt angle. Interior of aperture 

 nacreous, smooth. 



Alt. 5 1 /,, diam. maj. 7 1 /,; apert. alt. 2 1 /,, lat. 3 1 /, Mill. 



I know no species with which to compare this new form. It has no resemblance 

 with any of the figured species, but the aperture agrees sufficiently with such species as 

 C. perspectivum Koch. 



9. Calliostoma (Astelc) crassicostatum n. sp. PI. VI, fig. 1 . 



Stat. 133. Lirung, Salibabu-island. 36 M. Mud and hard sand. 1 Spec. 



Shell elevated-conical, with nearly straight sides, slightly attenuated towards the spire, 

 yellowish with purple-brown flames and rufous spots on the lirae. Whorls 7 1 /,, nucleus probably 

 smooth, but slightly worn, foliowed by three whorls, each with 3 strong, spiral lirae, of which 

 the basal one is the strongest, they are beaded where they are crossed by concentric ribs, which 

 disappear on the subsequent whorls; these have 3 strong spirals, of which the basal one forms 

 a conspicuous keel, a little above the linear suture, which on the lower whorls is accompanied 

 by a thin thread and a shallow channel between this and the keel ; an intermediate spiral, 

 between the i st and 2 d one, becomes on the last whorl nearly a 4* spiral; on the fourth 

 whorl the lirae are still beaded, on the fifth this is only the case with the upper one, the 

 interstices of the last 4 whorls are nearly smooth, with very fine growth-striae and only a few 

 deeper ones, especially on the upper whorls; base rather convex, with 8 lirae, the external 

 one bordering the subperipheral channel, the external 5 lirae are narrow, with broad, smooth 

 interstices, the central 3 are broad, all are ornamented with rufous spots; the base is covered with 

 very fine growth-striae and more remote deeper striae, rendering the central 2 lirae crenulated. 

 Umbilicus moderately wide, but seen from the base, nearly closed by a very strong, white, 

 striated funiculus. Aperture depressedly-rounded, with a thin but not quite intact margin, which 

 is crenulated by the external lirae. Columella cylindrical, very concave, slightly reflected over 

 the umbilicus, its base only very little angular; interior of aperture nacreous, smooth. 



Alt. 9, diam. maj. 8; apert. alt. 3, lat. 3 1 /., Mill. 



This new species has some superficial resemblance with the european C. zizyphiiium, but 

 is at once distinguished by its umbilicus, bordered by a strong funiculus or rib. I know no 

 species of the group Astelc, allied to it. 



10. Calliostoma (Astele) sp. 



Stat. 273. Pulu Jedan, east coast of Aru-islands. 13 M. Sand and shells. 1 Spec. 



Too young for identification or for description as a new species. 



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