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Show 1869.] LAND-SHELLS O F T H E SEYCHELLES. 65 slightly as regards the convexity of the whorls, the striation, and the spiral angle; these varieties I possess from all the above localities, occurring in all instances with others of the typical form. If E. ceylanica is to remain as a good species, I have three or four others possessing equal, or greater, claims to be distinguished. 16. HELICINA- ?. From Mahe, Praslin, and Silhouette. Amongst decayed leaves &c, on the ground. The shell varies somewhat in colour, sometimes being a bright red, at others an orange-yellow. 17. ONCHIDIUM ? From Mahe. Under stones &c, in damp places; common. 18. ONCHIDIUM ? From Praslin. On the stems and leaves of the "Coco-de-mer." The differences between this and the preceding species afford a curious parallel to those between Styl. unidentata and Styl. studeriana. In each instance the Praslin species are far more finely developed than their Mahe- representatives: whilst the latter appear to live always on the ground, the former seem to prefer a different habitat. Sometimes one sees the sea-cocoanut-trees covered with shells, not only the two above mentioned, but also Bulimus fulvicans, Cyclosto-mus pulcher, and others. On the common cocoa-nut tree I never at any place found any shell except Bulimus fulvicans. This species differs from the preceding in being considerably larger, in not possessing the oblong blackish spots, but in being covered with regular, small, roughish pustules, of the same colour as the rest of the animal, which is extremely variable. I found black, brown, and pure-white varieties; the underneath part also, instead of being a pinkish chocolate colour, is darkish yellow (varying in shade, sometimes quite white). 19. CYCLOSTOMUS (TROPIDOPHORA) PULCHER, Gray. From Mahe, Praslin, and Silhouette. On the Coco-de-mer, shrubs, &c. The shell varies in colour, but not, apparently, in form. 20. CYATHOPOMA BLANFORDI, H. Ad., n. sp. From Mahe. Extremely rare; amongst decayed leaves &c, on the ground, near a stream, rather high up. 21. CARYCHIUM, n. sp.? From Praslin, near the Protestant church, at the foot of a common cocoa-nut tree. I unfortunately only found a single specimen, which I hardly like to describe as new, though it differs from C. mau-ritianum in very many respects. 22. MELAMPUS LIVIDUS, Desh. From Mahe' and Praslin. PROC. ZOOL. SOC-1869, No. V. |