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each rib consisting of about 2 lamellae, sutures deeply channelled. Base convex, with 5 beaded 

 spirals and lamellose ribs. Moreover the whole shell is covered with microscopic growth-striae. 

 Umbilicus narrow, partly covered by the columellar margin. Aperture subquadrangularly rounded, 

 outer and basal margins rounded in outline, thin, thickened interiorly, with 10 spiral lirae; 

 columellar margin cylindrical, only slightly curved, with a rather strong transverse fold, its base 

 running without angle in the basal margin, slightly expanded over the umbilicus, its upper part, 

 connected by a thin layer, with the outer margin. 



Alt. 6^4, diam. maj. 4!^/^; apert. alt. 2Y0, lat. 2^3 Mill. 



Closely allied to C. elisa Gld. which is however imperforate, without brown markings 

 and has not the conspicuous spinous keel of the new species. In colour it should resemble 

 C. mactilaia Brazier, which has however four spiral lirae and is imperforate. 



14. Calliostoina (Perrinia) nigra inaculahim n. sp. PI. VI, fig. 4. 

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



Shell elevated-conical, with convex sides, imperforate, yellowish-white, with black-brown 

 square spots, running from the suture to the keel, and more numerous narrow spots and streaks 

 of the same colour on the base; nucleus wanting; remaining whorls 7Y3, slightly convex, separated 

 by a narrow channelled suture. Upper whorls slightly worn, with 3 and 4 spiral lirae, which 

 increase to 5 in number on the last 4 or 5 whorls ; they are crossed by slightly undulating 

 ribs, with beads where they cross each other, the lowest of the lirae forming the peripheral 

 keel is the largest, and on this one the beads have a tendency to become squamate, (but not 

 so much as in the preceding species). Last whorl descending in front and here the ribs form 

 irregular lamellae; periphery of last whorl angular. Base convex, with 5 spiral, beaded lirae, the 

 interstices with strong, irregular lamellae. Aperture nearly round, angular at the upper part and 

 very faintly so at the base of the columella. Outer and basal margins thin, thickened interiorly, 

 with 10 conspicuous lirae, that nearest the columella toothlike. Columella cylindrical, with a 

 groove round its upper part, running at its left side towards a square notch, formed by a square, 

 toothlike fold at the basal part and the most pro.\imal of the internal lirae of the base, below 

 the notch are one large and two small denticles; parietal wall callous. 



Ah. 10Y4, diam. maj. 670 ; apert. alt. 37., lat. 37.4 Mill. 



Distinguished from the preceding species, with which it is allied, by its strongly elevated 

 shape, by 5 lirae instead of 3 (C. maculata Braz. with 4) and by the characters of the columella, 

 which are more complicated than in the allied species. The columellar notch calls in mind, that 

 of some species of Monodonta and Eiuhebts. 



\^. Calliostoina (Perrinia) cancellaticin n. sp. PL VI, fig. 5. 



Stat. 59. Western entrance of Samau-strait. 390 M. Coarse coralsand with small stones, i Spec. 



Shell elevated-conical, with convex sides, imperforate, yellowish-white, with a nacreous 

 lustre and numerous yellowish-brown spots, which are darker near the upper part of each whorl 

 and on the third whorl, the first and second being without markings. Nucleus wanting, remaining 



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