1884.] OF THE 'CHALLENGER' EXPEDITION. 2G9 



dirty yellowish variegated with brown spots. Whorls 10, nearly 

 flat, faintly marginate beneath the suture, finely striated lengthways. 

 Outer lip considerably expanded towards the lower part, dirty whitish, 

 marked with a few pale brownish spots near the margin and armed 

 within with six denticles, of which the first, second, fourth, and 

 sixth, counting from the upper end, are minute, the third and fifth 

 being a trifle larger and generally of a light-brown or yellowish 

 tint. There are two parietal teeth and a minute tubercle just under 

 the lower one, which is lamelliform, the upper one being very like 

 that of P. scarabceus. Columellar tooth transverse, produced a 

 little way across the reflexed margin, which is yellowish at this 

 part, as also are the denticles on this side of the aperture. The 

 labrum is pale externally, and exhibits the usual dark oblique stripe 

 at a short distance from the margin. 



Length 19 millim., diam. 12; labrum 11 long, 7| broad. 



This species has the general appearance of a dwarfed form of 

 P. scarabceus ; but may be distinguished by the different armature 

 of the aperture, which is perfectly constant in all the seventeen 

 specimens examined. It possesses an additional basal denticle on 

 the outer lip, and a minute tubercle on the body-whorl between the 

 columella and the lower of the parietal teeth. The position of the 

 aperture is also more lateral, but rather less so than in P. ceylonica. 



4. Melania apiensis. (Plate XXII. figs. 11, 11 a.) 



Shell elongate, subulate, covered with an olive-brown or yellowish- 

 olive epidermis, variegated with oblique red lines beneath the sutures, 

 which, in some specimens, are produced in a wavy manner across the 

 whorls and in others are interrupted at the middle, or, again, some 

 of the stripes maybe continuous and others interrupted on the same 

 whorl. Volutions probably about 15 in number, but invariably 

 more or less broken off above, with almost flat sides or but the 

 slightest convex, exhibiting only the very faintest constriction below 

 the suture, which is considerably oblique and deep. The sculpture 

 consists of fine lines of growth and a variable number of spiral striae, 

 those around the base of the body-whorl and a few at the lower 

 part of the upper whorls being deep and pretty constant, and in 

 some specimens one or two revolving below the suture produce a 

 marginate appearance to the whorls. The aperture is pyriform, of a 

 lead-colour, and the columella white. 



Length of six remaining whorls of the largest specimen 70 millim., 

 diam. of last whorl 1 7. 



This form may be only a variety of M. scipio, Gould, from the 

 Samoa and Fiji Islands, but coming from another locality offers 

 certain differences in coloration and sculpture which appear to dis- 

 tinguish it. In painting, some specimens agree with M. fguratu, 

 Hinds ; but none of them have the whorls plicate beneath the suture 

 as described by that author. 



5. Melania turbans. (Plate XXII. figs. 12, 12 a.) 



Shell elongate, subulate, covered with an olivaceous epidermis, 

 Proc. Zool. Soc— 1884, No. XIX. 19 



