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Show 208 MR. H.ADAMS ON LAND AND MARINE SHELLS. [Feb. 18, BULIMUS (DRYMCEUS) RAWSONIS, sp.nov. (Plate XXIII. fig. 12.) B. testa subimperforata, elongato-ovata, tenui, oblique longitudinaliter striolata et striis minutissimis cincta, nitida, alba, ad apicem et ad basin aurantiaca; spira elevato-conica, apice acutiusculo, sutura impressa; anfr. 6\, convexiusculis, ultimo spiram sub-eequante, basi vix attenuato; apertura parum obliqua, oblongo-ovali; perist. simplici, recto, margine columellari superne reflexo, perforutionem fere occultante. Long. 24, diam. 10 mill. Hab. Tobago (Mr. Rawson). CORBULA PYGMCEA, sp. nov. (Plate XXIII. fig. 13.) C. testa solida, subovata, ventricosa, eequilaterali, sulcis concentricis, minime profundis sculpta, albida; umbonibus medianis, incon-spicuis; latere antico rotundato ; latere postico angulato ; margine ventrali arcuato; declivitate umbonali obtuse angulata. Long. 2-|, alt. 2, lat. 1 mill. Hab. Persian Gulf (coll. M'Andrew). TELLIDORA PELLYANA, sp. nov. (Plate XXIII. fig. 14.) T. testa sub triangulari, incequilaterali, utrinque convexiuscula, solidula, concentrice tenuissime lirata et leviter plicata, plicis ad latus posticum attenuatis, prominentibus, albida; umbonibus postmedianis, acutis; margine dorsali anticesubincurvato, postice subrecto; margine ventrali convexo, postice sinuato; fiexura distincta. Long. 10, alt. 9, lat. 2\ mill. Hab. Persian Gulf (coll. M'Andrew). THYELLA LAMELLOSA, sp. nov. (Plate XXIII. fig. 15.) T. testa ovato-triangulari, solidula, modice convexa, fere eequilaterali, lamellis erectis numerosis concentricis et striis confertis minutissimis radiantibus sculpta; margine dorsali antice incur-vato, postice convexo; margine ventrali arcuato, postice paulum sinuato. Long. 12, alt. 9, lat. 6 mill. Hab. Mauritius (coll. H. Ad.). THYELLA HARGRAVESI, sp. nov. (Plate XXIII. fig. 16.) T. testa triangulari, solidiuscula, subventricosa, eequilaterali, lamellis distantibus irregularibus concentrice et striis exilibus confertis radiatim sculpta ; latere anteriore arcuato; latere postico convexo; margine ventrali postice valde sinuato. Long. 6i, alt. b\, lat. 3^ mill. Hab. New Hebrides (coll. Hargraves). The genus Thyella was founded by me some years since upon a small shell in Mr. Cuming's collection, and stated to have affinity with Semele. It is also near Montrouziera, Souverbie ; but that |
