MARINE MOLLUSCA. 617 
252. Obeliscus monilis, A. Adams, 40,0, //. IX, XIV. 
253. Obeliscus sulcatus, A. Adams, 40,),//. XV. 
Family NERITIDAE. 
254. WNerita albicilla, Linn. 37,/X. IX, XV. 
255. WNerita histrio, Linn. 37,/X. XI. 
256. WNerita plicata, Linn, 37,/X. IX, XI. 
257. Werita polita, Linn. 37,/X. I, XII. 
Family TURBINIDAE, 
258. Turbo (Senectus) argyrostoma, Linn. 37, /V. (var.= 7. margaritaceus, Reeve, 37, IV.) 
EXC OXGT EXGV), 
Family LIOTIIDAE. 
259. lLiotia squamicostata, n. sp. (Pl. XXXV. fig. 24). X. 
Testa subglobosa, anguste umbilicata, alba; anfractus quatuor, ad suturam canaliculati, costis 
granosis spiralibus (in anfractu penultimo 4, in ultimo 8) cincti; granula ad peripheriam subsqua- 
miformia; apertura circularis, margine externo crenulo, columellari incrassato, reflexo, Diam. maj. 
5 mm,, alt. 4. 
The spiral ridges are rather strong, broader than the grooves between them, and the granules 
upon the second, third, fourth, and fifth upon the body-whorl, and the second and third upon the 
penultimate, are scale-like, and that which encircles the umbilicus is much thicker than the rest and 
transversely grooved. The terminations of the spirals upon the outer lip give it a crenulated aspect. 
Family TROCHIDAE. 
260. Trochus (Lamprostoma) incrassatus, Lamarck, 34, X¥/. I, XV. 
261. Trochus (Lamprostoma) maculatus, Linn. 34, YJ. IX, XI. 
262. Trochus (Lamprostoma) obesus, Reeve, 37, X///J. IX. 
263. ‘Trochus (Lamprostoma) radiatus, Gmelin, 34, X/. XI. 
264. Thalotia maldivensis, n. sp. (Pl. XXXV. figs. 25, 26). II, X. 
Testa parva, elate conica, imperforata, ad peripheriam acute angulata, supra viridis, ad suturam 
albo et roseo maculata, apicem versus rubescens, supra anfractum ultimum strigis albis obliquis paucis 
ornata, infra roseo et albo tessellata; anfractus 8—9 plani, seriebus granulorum parvorum septenis 
(quarum series duae inferiores contiguae et albo et roseo maculatae) instructi, ultimus infra angulum 
seriebus 9—10 ornatus, subplanus; apertura obliqua, subquadrata, margaritacea, iridescens; labrum 
tenue; columella alba, incrassata, reflexa, leviter arcuata, antice truncata. 
7 
Diam. maj. 7} mm., min. 7, alt. 10. Var. Testa rufescens, concolor. 
A very pretty conical shell, generally more or less green with a white and pink spotted band 
above the suture and dotted with pink in the middle of the base. Some examples are uniformly 
pinkish reddish and with. only tinges of green above or below. 
