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Show 1871.] MR. HARPER PEASE ON POLYNESIAN LAND-SHELLS. 467 T. globoso-conoidea, crassa, tenuissime radiatim striata, omnino straminea aut albida, interdum rufescens, juxta suturam straminea, apex semper straminea; spira conoidea, convexa, obtusa; anfr. 5, convexiusculi, ultimus ad peripheriam rotundatus vel indistincte angulatus; callus basalis, nitidus, albidus, circumscripta; apertura fere lunaris; perist. simplex, rectum, incrassatum,- columella arcuata, simplex, cum perist. continua. Diam. 7, alt. 5-§- mill. The above, collected at the Tahitian Islands, was confounded by M . Hombron with a species inhabiting the Hawaiian Islands described by Dr. Philippi. HELICINA GUPPYI, Pse. Helicina humilis (Guppy, non Hombr.), Ann. Nat. Hist. ser. 4, vol. i. p. 434 (1868). To prevent confusion I alter the name of the above West-Indian species, which was preoccupied for one inhabiting Polynesia. HELICINA COLORATA, Pse. Helicina colorata, Pse. A m . Journ. Conch. 1868, p. 156. Helicina anaaensis, Mouss. Journ. de Conch. 1869, p. 66. The above is the only species inhabiting the island of Annaa, where it was collected by Mr. Garrett. The above name was given to it by reason of the many variations of colour it passes through. It is wholly whitish, or of different shades of yellow or red, sometimes banded with the same colours; occasionally the last whorl is yellow, and the spire bright crimson. HELICINA FLAVESCENS, Pse. Helicina flavescens, Pse. A m . Journ. Conch. 1867, p. 228. Helicina pacifica, Pse. A m . Journ. Conch. 1865, p. 291. The redescription of the above species by myself arose from omitting to name the specimens in m y collection when first described. I retain the above name as being more appropriate and its description more full. Genus TAHEITIA. Taheitia, H. & A. Ad. Ann. Nat. Hist. 1863, p. 19. The chief and, I may add, the only peculiarity which serves to distinguish the above genus from Truncatello is its operculum. Tbe other characters mentioned by Messrs. Adams, viz. the porrection of the last whorl and its being disconnected from the penultimate whorls, are not constant. Taheitia aurantia, Gld., can scarcely be distinguished from Truncatello pacifica, Pse., in any of its characters except the operculum. Taheitia pallida, Pse., is also in all respects a Truncatella except the operculum. The East-Indian species wallacei, H. Ad., and clathrata, H. Ad. & Ang., are more characteristic of this genus than the Polyne- |