in all the specimens is externally very convex, with close-set granules, the margin is deep violet, 



especially the columellar one. 



The measurements of this adult specimen are : 



Diam. maj. without lamellae 20, with lamellae 25, alt. 15 Mill. 



7. Astraliuni (Cyclocantha) provisoriuiii n. sp. PL II, fig. 3. 



Stat. 144. North of Salomakiee-(Damar)-isiand. 45 M. Lithothamnion-bottom. i Spec. 



Shell conoidal, with a flat base, imperforate, whorls about 5, the upper three eroded and 

 nearly covered by incrustations, but apparently rather smooth, penultimate whorl with oblique 

 wrinkles, crossed by 3 or 4 spiral rows of square granules; towards the last whorl, irregular 

 tubercles make their appearance, about 8 on the last whorl ; these are also covered by the 

 wrinkles and granules, below the tubercles, the last row of granules runs uninterrupted and is 

 succeeded towards the keel by short plications, which have about the same direction as the 

 wrinkles. Moreover the upper surface of this whorl is covered by spiral lirae, only visible under 

 a lens. The whorls are inflated at their upper part, concave at the lower portion and are then 

 again broader, thus covering the sutures and even part of the subsequent whorls. Keel very 

 sharp, with short spines, about 1 7 in number, if seen from the base. These spines are com- 

 pressed, open in front. Base flat, with 8 irregular lirae, with compressed scales ; towards the 

 keel, a few undulating spiral striae appear-, this sculpture is crossed hy small radiating riblets. 



Aperture rhomboidal, very oblique, with sharp edges and an internal nacreous layer, at 

 some distance from the margin, with 10 lirae near this margin, and a groove corresponding to 

 the keel- basal margin smooth, columella emarginate, thick, thickened towards the base and 

 forming a toothlike angle, at the junction with the basal margin. Colour of the shell yellowish- 

 olive ; the top-whorls, a zone at the base of the whorls, especially of the last one rose-coloured ; 

 the base tinted with the same colour. 



Alt. 10, lat. II; apert. alt. from upper to basal margin 6Y0, lat. 4^0 Mill. 



This shell has the appearance of being not adult, it resembles much the juvenile state of 

 the preceding species, and also, but less. Reeve's figure of TrocJuts liexagonus (Reeve, Trochiis 

 fio-. 61). It differs from both by the peculiar colour, and the beautiful row of spines or scales. 

 Thouo-h I should prefer to wait for more materials, it is so improbable that these will be 

 procured in a short time, that I have described this species and named it in accordance with its 

 somewhat doubtful character. 



Leptothyra Carpenter. 



I. Leptothyra sp. 



Stat. 43. Pulu Sarassa, Postilion-islands. Up to 36 M. Coral, i Spec. 



One small, probably young specimen, which I could not identify with certainty, too 

 incomplete for description, differs from the next species by the very numerous spiral lirae, of 

 which one, near the shoulder is stronger, and by its prominence, forms a slight angle, the upper 



whorls are beaded. 



31 



