63 



part of the upper whorls. Moreover the whole shell is covered with fine growth-striae, which 

 form a large sinus above near the suture and are protracted below near the keel, following 

 the direction of the riblets; base rather smooth, but sculptured by similar striae as on the upper 

 part, being partly riblike ; the whole base is covered with spiral striae, most conspicuous towards 

 the umbilicus and keel, leaving a smoother median space. Umbilicus pervious, funnel-shaped, 

 its largest diameter occupying nearly l j i of that of the base, its margin bordered by a strongly 

 beaded rib, which can be foliowed still a little in its interior, which is otherwise rather smooth, 

 thouo-h. sculptured by very fine radiating and spiral striae. Aperture rhombic, upper margin 

 thin, slightly broken, but judging after the growth-striae, sinuous above, protracted towards the 

 keel, which appears to have been toothlike ; basal margin sinuous in the same marmer; 

 columellar margin sinuous, reflected, forming an angle with the basal margin. Operculum very 

 thin, corneous, with few whorls. 



Alt. o 1 /,, diam. maj. 9; apert. alt. 3, lat. 3 s / 4 Mill. 



This species has a slight resemblance to B. alta Wats., but is much more depressed, 

 with concave sides, and differing in many other respects, on closer examination. 



The rhachidian tooth (R) of the radula has a subquadrate body, with rounded posterior 

 corners, enlarged sides and a short, reflected cusp, with a few denticles; lateral (1) subtriangular, 

 with a short, reflected cusp, with small denticles at the distal margin. I can detect no more 

 teeth, belonging with certainty to the median part. Uncini (U) long, slender, with distinct smaller 

 teeth near the top. 



If the cusps of the median teeth were stretched out, they would resemble those of B. 

 huupra, however they would be less slender. 



2. Bas il is sa sp.? 



Stat. 17S. 2°4o'S., [28°37'.5E. 835 M. Blue mud. 1 Spec. 



With much doubt I mention a broken shell, as belonging perhaps to this genus, only 

 on account of some resemblance to the preceding species. 



Calliostoma Swainson. 



1. Calliostoma rufomaculatum n. sp. PI. V, fig. 4. 



Stat. 204. Northern entrance of Buton-strait. 22 M. Sand with dead shells. 1 Spec. 



Shell elevated-conical, imperforate, fiesh-coloured, with rufous spots on the upper surface, 

 and oblong streaks of the same colour above the suture, upper whorls violet. Sides of the 

 spire concave towards the top, convex towards the periphery. Whorls 9, nucleus white, nearly 

 smooth, but under a lens, with rows of small pits, the subsequent 4 violet whorls, with 3 spirals, 

 crossed by numerous ribs, beaded where they cross each other, leaving square interspaces; lower 

 whorls with conspicuously beaded spirals, of which there are 6 larger on each whorl, and in the 

 interstices a much smaller thread, more or less beaded; last whorl angular at the periphery. 

 Base convex, with 14 spiral lirae and a few intermediate ones, some of these intermediate lirae 



