OCR Text |
Show 1871.] MR. H A R P E R PEASE O N POLYNESIAN LAND-SHELLS. 461 been discovered since that the species abound on all the islands of the several groups, even on the low sandy Atolls. So far as known, they m a y be arranged in three groups, viz.: - first, V. nitens, Pse., & c , white, pellucid, nearly smooth ; second, V. lyrata, Gld., striatula, Pse., & c , generally oblong in shape, distinctly ribbed, aperture campanulate, modified by the transverse grooves on last whorl; and third, V. costulosa, Pse., more abbreviate in shape, sometimes nearly globular, finely ribbed or elevately striate, and aperture nearly circular. The following are new species. VERTIGO STRIATULA, Pse. T. cylindracea, oblonga, solidiuscula, sinistrorsa, umbilicata, longitudinaliter oblique etfiexuose forte costata, interstitiis transversim tenuiter striatis; anfr. 5, rotundato-convexi, plerumque medio rotundatim angulati, ultimus vix porrectus, medio concentrice late sulcatus, circa umbilicum rotundato-angulatus, basi compressus; apex obtusus; sutura bene impressa; apertura subquadrangularis, basi rotundata, lamellis 3 coarctata, in pariete aperturali 2, primo magno, cum labro continuo, secundo mediano, interno, in margine columellari superne 1, ad labium juncta; peristoma continuum, crassiusculum, vix expansum et refiexum, labro postice sinuoso; rufo-castanea, costis albidis. Alt. 2|, diam. lg. Hab. Insula Hawaii. VERTIGO ARMATA, Pse. T. ovata, vix oblonga, nitidiuscula, dextrorsa, perforata, longitudinaliter tenuissime striata, interdum remote, tenuiter filo-costata, sub lente subtilissime granulosa, fulvescenti-cornea, fills albidis ; anfr. 4\-b, rotundato-convexi; apex obtusus; apertura subqua-drangularis, fere circularis, dentibus 8 munita, in pariete aperturali 3, primo maxima cum labro continuo, secundo mediano, intrante, tertio minimo, interno, in margine columellari 1, in marginibus basali et labiali 4, profunde sitis; peristoma incrassatum, rufescens, subexpansum, refiexum, marginibus disjunctis, labro postice vix sinuoso. Alt. 2, diam. 1| mill. Hab. Insula Bolabola. VERTIGO SIMPLARIA, Pse. T. tenuis, obeso-ovata, dextrorsa, rimata, flavescens, longitudinaliter tenuiter striata; anfr. 3, rotundato-convexi, ultimus planulatus; sutura valde impressa; apex obtusus; apertura fere circularis, edentata; peristoma tenue, marginibus disjunctis; columella superne patula, vix expansa. Alt. If, diam. 1 mill. Hab. Insulae Marquesas. VERTIGO COSTATA, Pse. T. cylindracea, oblonga, solidiuscula, dextrorsa, rimato-perforata, |