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DESCRIPTION OF A NEW SPECIES OF OLIVA FROM 

 THE ANDAMAN ISLANDS. 



By F. G. Bridgman. 



Read Vlth 3farch, 1909. 



Oliva Andamanensis, n.sp. 



Shell cylindrical with the outlines a little curyed, yellowish, 

 copiously covered with angular clouded purplish - brown markings, 

 which often coalesce, forming a kind of reticulation. This is some- 

 times (but not always) suddenly interrupted towards the labrum, 

 leaving a plain yellowish tract or space entirely or almost without 

 markings. The acute sutural margin of the body-whorl is marked 

 with spots or sliort lines of a purer and darker brown colour, which 

 also are visible upon the upper whorls when not hidden by a callous 

 deposit which invariably covers the spire. This is shortly conical, 

 yellowish, and without markings, excepting the sutural spots or lines 

 already referred to. The apex is usually of a lilac tint. Whorls 7, 



the three apical a little convex, the three following obliquely 

 flattened, the last marked off by a narrow channelled suture ; labrum 

 a little thickened, generally pale or purple-whitish at the edge ; 

 aperture rather naiTow, purplish ; upper half of basal fasciole yellow, 

 lower half marked with short brown lines forming an oblique band ; 

 columella with a defined white callus bearing about 15-18 transverse 

 lirse. These are much more evident in some specimens than in 

 others, and four of them are produced over the end of the whorl, 

 the uppermost forming the margin of the callus, which is almost white 

 or faintly tinted with pale red anteriorly. 



Length 21,diam. 10 mm. 



S^ab. — Andaman Islands. 



In many respects this shell is closely allied to certain varieties of 

 Olira carneola, Lam., and 0. todosina, Duclos, and in fact is separated 

 almost exclusively by difference of colour and locality. 



The typical forms of carneola and todosina exhibit transverse 

 banding, a feature which has not yet been observed in the present 

 species from the Andaman Islands. 



