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Show 454 MR. HARPER PEASE ON POLYNESIAN LAND SHELLS. [May 2, PlTYS FILOCOSTATA, Pse. T. discoidea, late umbilicata, tenuiuscula, radiatim oblique et remote filocostata; spira depressa, planulata, sutura bene impressa; anfr. 4, convexi, ultimus rotundatus, umbilicus \ diametri occu-pans; apertura vix obliqua, sub circular is; paries aperturalis lamellis 2 intranlibus munitus; perist. simplex, rectum ; fiavido rufo alternatim strigata, strigis flexuosis, epidermide tenui induta. Diam. 4, alt. 2 mill. Hab. Insula Kauai. Allied to P. hystrix, Migh. It may be distinguished at once by the thread-like character of its ribs, which are remote and shining white when the shell is in good order. It is also smaller, and the whorls are regularly convex. The radiating stripes are curved and flexuous. PITYS ANALOGICA, Pse. T. aperte umbilicata, solidiuscula, radiatim forte costata, costis peripheriam flexuosis, interstitiis transversim fere obsolete striatis; spira fornicate-convexa, apice depresso, sutura valde impressa ; anfr. 7, rotundato-convexi, lente accrescentes, ultimus ad peripheriam late rotundatus; apertura vix obliqua, semilunaris, lamellis 7 coarctata, 2 parietalibus, 3 basalibus, 2 columellar ibus; perist. simplex; fiavido et rufo irregulariter radiatim strigata. Diam 5-J. alt. 3 mill. Hab. Insul. Marquesas. PITYS VERECUNDA, Pse. T. planorboidea, tenuiuscula, late umbilicata, radiatim regulariter tenuicostulata, supra planulata, sutura impressa ; anfr. G, convexi, ultimus ad peripheriam rotundatus, umbilicus fere \ diametri occupans; apertura late lunaris, lamellis 6 coarctata, 2 parietalibus, 3 basalibus, unique columellari; perist. simplex; flavida, pallide rufo fiexuoso-strigata. Diam. 5, alt. 1| mill. Hab. Insul. Marquesas. The above two species are the first of the genus discovered on the Marquesan Islands. Genus E N D O D O N T A , Alb. This genus was founded by Dr. Albers on H. lamellosa, Fe'r., which represents a group of species of peculiar characters inhabiting the Hawaiian Islands, and confined to that locality. Most authors have confounded it with Pitys (Beck), from which it differs in both shell and animal. At the Tahitian Islands a group of species occurs nearly related to the above, which are also confined to that locality, none similar having been discovered in any other part of Polynesia. They are peculiar in being loosely coiled, and more widely umbilicate than any other species of Helicince; they are widely distributed over all the islands, and are more or less nearly related to each other and to the |