MOUTTSCA. 489 



base are much deeper. The aperture is very narrow, the outer 

 lip being thin and moderately sinuated above the angle. The spire 

 is short, gradated, with rectilinear outlines. Length 24 millim., 

 diameter 12 1. 



Providence Eeef, Mascarenes, in 24 fms. 



I have named this species in honour of Prof. E. von Martens, 

 from whose work on the Mollusca of the Mascarenes I have obtained 

 much information and assistance. It is distinguished by the 

 narrowness of the aperture, its somewhat pyriform shape, and the 

 uniform orange tint of its colouring. The spire is paler, except at 

 the deepish suture, which is likewise orange. 



11. Conns articulatua. (Plate XLIV. fig. B.) 

 Sowerhy, Proc. Zool. Soe, 1873, p. 146, pi. xv. fig. 3. 



Shell shortly fusiform, brownish pink, encircled near the middle 

 of the body-whorl with a white zone interrupted with blotches of a 

 deeper tint than the general ground-colour of the shell, everywhere 

 ornamented with transverse rows of minute reddish dots, which are 

 invisible to the naked eye. Spire white, terminating in a pink 

 apex, dotted with reddish brown upon the angle of the whorls, and 

 blotched with the same colour upon their upper surface. Volutions 

 9, slowly enlarging ; three apical smooth, glossy, convex ; the rest 

 in steps one above the other, sloping above, faintly grooved imme- 

 diately beneath the suture, the furrow being broad, occupying half 

 the upper surface of the whorls, but very shallow, not spirally 

 striated, exhibiting only fine arcuate lines of growth. The last 

 whorl is acutely carinate above, very faintly convex at the sides, 

 and contracted towards the front ; it is smooth at the upper half, 

 and rather coarsely sulcated across beneath, a few of the intervening 

 ridges at the base and two passing through the subcentral white 

 band being rather more distinctly dotted than the rest of the sur- 

 face. Aperture narrow, and outer lip thin and slightly sinuated 

 behind. Length 12 millim., diameter 6. 



Providence Eeef, Mascarenes, in 24 fms. 



This species is represented in Weinkauff's monograph of this 

 genus (Conch .-Cab. pi. 56. flgs. 1 & 4) under the name of C. ana- 

 batrum. C. anabafhrum of Crosse is, however, perfectly distinct 

 from the species here described, but is regarded by myself as a 

 variety of 0. japonicus, Hwass. 



The locality " Mauritius " quoted by Weinkauff is confirmatory of 

 the conclusion arrived at that his shell belongs to the same species 

 as that from Providence Eeef, and the figure, although representing 

 a larger specimen, is fairly characteristic. 



12. Pleurotoma (Defrancia ?) grisea. (Plate XLIV. fig. C.) 



Shell very small, subfusiformly ovate, grey or dirty white, some- 

 times spotted with brown below the suture, or exhibiting one or 

 two pale or whitish spiral lines. Whorls 8 ; first 4^ white, smooth, 



