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curved; columella rather straight, truncated at the base and with a toothlike tubercle about 

 halfway its length, it forms a distinct angle at its junction with the basal margin. 



Alt. lo, diam. maj. 9; apert. alt. 4''/,,, lat. 4^0 Mill. 



Though the only specimen has a somewhat juvenile appearance, it is so much different 

 from the described species known to me, that I thought it desirable to describe it; the most 

 salient characters are : the diversity of colours, being white-, crimson- and black-blotched on the 

 same shell, and the ribs which are especially conspicuous towards the keel. 



Monilea Swainson. 



1. Monilea calyculus Wood. PI. IX, fig. 5. 



Wood. Ind. Test. Suppl. Pi. 6, fig. 44. 



Nevill. Journ. Asiatic Soc. Bengal, 1874, p. 2S, PL i, fig. i [Masonl). 



Smith. Proc. Zool. Soc. Lond. 1S7S, p. 8t8. 



PiLSBRV. Man. of Conch. Vol. XI, p. 247 and 470, Pi. 41, fig. 14, 15. 



Stat. 37. Sailus Kctjil, Paternoster-islands. Up to iS M. Coralsand. i Spec. 



Stat. 133. Lining, Salibabu-island. },6 M. Plard sand. 2 Spec. 



Stat. 240. Banda. 9 — 16 M. Lithothamnion-bottom. 4 Spec. 



Stat. 313. East of Dangar Besar, Saleh-bay. Up to 36 M. Sand. 6 Spec. 



Some controversy has e.xisted about the specific value of this form; many authors unite 

 it with M. callifcra Lam. So Pilsbry (1. c.) declared it a synonym on page 247, and as doubtless 

 distinct on page 470. I think, after comparing several specimens of both forms, that Pilsbry is 

 right in his last opinion. Both species though very variable in colour and painting, seem to be 

 considerably different in shape and sculpture. 



Operculum thin, light brown, with few (about 6) whorls, very concave exteriorly, shining 

 and very convex on the inner side. 



The radula has a very delicate appearance, the three median teeth being very pellucid. 

 The rhachidian tooth (R) has a broad, triangular body, with convex sides, the cusps of this and 

 of the first laterals are very inconspicuous, and have more the appearance of a thickening of the 

 mai-gin, than of a real cusp; the body of the first lateral (i) resembles one half of the rhachidian 

 tooth, that of the second lateral (2) is slightly more oblong; the third (3), fourth (4) and fifth (5) 

 are quite oblong, this last has at its distal upper corner a small auricle. The uncini (U) have 

 conspicuous cusps on long bodies, and a small denticle at their distal margin, their shape however 

 is not easy to be made out, on account of their standing so crowded; their number is more 

 than 100 on each side. 



2. Monilea eelebe)isis n. sp. PI. II, fig. 10. 



Stat. 71. INIakassar and surroundings. 27 — 32 ]M. i Spec. 



Shell small, depressed-conoidal, with about 6 angular whorls; nucleus smooth, followed by 

 2 whorls, each with 2 spiral lirae, of which the uppermost, standing about midway the whorl, is 

 more prominent and renders the whorls angular, these whorls being flattened towards the suture, 



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