492 COLLECTIONS FEOM THE WESTEKN INDIAN OCEAN. 



The oosfcEB are seven in number on the last volution, and eight or 

 nine on the upper ones. There are two principal transverse ridges 

 on the latter, with a smaller one between them, the uppermost 

 being situated at the angle about the middle of the whorls, and the 

 lowermost at the suture below. The body-whorl has three stout 

 ridges round the middle part, and two rather more slender ones 

 below, in addition to the raised squamous ridge around the cauda or 

 extremity. On crossing the costaB these ridges are considerably 

 produced into prickly hoUow scales, and are everywhere crossed by 

 very fine elevated lines of growth. The aperture is lilac, not greatly 

 contracted anteriorly, and, together with the canal, occupies about 

 half the entire length of the shell. The outer Hp is armed within 

 with about six short lirae ; and the columella exhibits a tubercle 

 at the upper part and one or two below the middle. The canal is 

 short, open, and recurved. Length 8 millim., greatest width 4^. 

 EtoUe Island, Amirantes, in 13 fms., coral. 



21. Murex (Ocinebra) darrosensis. (Plate XLIV. fig. F.) 



Shell small, fusiformly ovate, white, spotted upon and between the 

 ribs with pale and dark brown. Whorls 7, the apical smooth, 

 convex; the rest subconcavely sloping above, angulated near the 

 middle, straightish at the sides, longitudinally costate and spirally 

 ridged. Costae moderately strong, about nine on a whorl, produced 

 into angular prominences where crossed by the chief transverse 

 lirffi ; the latter are three in number on the upper volutions, all 

 on their lower half, and five or six on the last. In addition to 

 these, the surface is ornamented with several finer intervening lirae 

 and very fine lines of growth. The aperture is rather open, ovate, 

 contracted into a short, open, oblique, recurved canal, and somewhat 

 stained with yellow. The labrum has a broad varix exteriorly, and 

 about eight fine lirae within. The columella is arcuate above, 

 yellowish, and bears a smaU tubercle or two below the middle. 

 Length 11 miUim., greatest width 6. 



Darros Island, Amirantes, 22 ftns. ; broken-coral bottom. 



This species closely resembles M. nitens, A. Adams, but is 

 smaller, has the upper part of the whorls more concave, and more 

 numerous longitudinal costae. 



22. Pisania ignea, Gmelin. 

 Darros Island, Amirantes. 



23. Pisania (Tritonidea) undosa, Linne. 

 Darros Island, Amirantes. 



24. Cplumbella turturina, Laniard: 

 African and Eagle Islands, Amirantes, 10-12 fms. 



