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Show 256 MR. E. A. SMITH ON THE [Apr. 1, subnodosis (in anfr. ult. infr. medium evanidis) instructi ; aper-turaparva, longit. totius | haud cequans ; labrum ad marginem tenue, costa ultima valida extus incrassatum, superne leviter sinuatitm. Longit. 5 millim., diam. 2. Although the general appearance of this little species as regards colour is as above described, still, on closer examination, the style of ornamentation proves to be less simple ; the white band is seen to be subdivided by a fine line of the same colour as the rest of the shell, and a few wavy darker brown lines flow down the lower portion of the body-whorl. One specimen has the brown colour replaced by a pinkish or vinous tint. PLEUROTOMA (DRILLIA) TURTONI. (Plate XXI. fig. 3.) Testa breviter fusiformis, flavescens, inter costas fusco tincta, suturas alba, circa anfr. ultimi medium albo zonctta ; anfr. primus convexus, Icevis, duo sequentes in medio carinati, cceteri superne concavi, deincle convexi, costis brevibus circiter 12 obsoletis lirisque spiralibus 4-6 inter costas fuscis infra suturam corrugati ; anfr. ultimus inferne contractus; apertura angusta, longit. totius \ paulo minor ; labrum ad marginem tenue, extus costa variciforme arcuata incrassatum, intus denticulatum; columella alba, denticulis transversis pluribus munita ; sinus profundus ; canalis brevis, recurvus. Longit. 18 millim., diam. 6. The colouring of this species is very pretty. The spire has the appearance of being alternately zoned with white and yellow, the yellow zone, falling upon the lower and costate portion of the whorls, is interrupted by a brown stain between the ribs. The lower half of the body-whorl, excepting the pale extremity, is yellowish, and has the appearance of being dotted with brown. This species belongs to that section of the genus which includes PL intercalaris, Carpenter, PI. spurca, Hinds, and a few others. These species have the columella and the interior of the labrum more or less denticulated. PLEUROTOMA (MANGILIA) SUBQUADRATA, Smith. (Plate XXI. fig. 4.) This species was described in the Ann. & Mag. Nat. Hist. 1888, vol. ii. p. 313. PLEUROTOMA (MANGILIA) GEMMA, Smith. (Plate XXIII. fig. 2.) Pleurotoma (Mangilia) gemma, Smith, Ann. & Mag. Nat. Hist. 1884, xiv. p. 322. The specimens obtained by Mr. Turton are larger and in fresher condition than those originally described, and show that the upper ends of the costae are not constantly red alternately, as some of these examples have all of them of a reddish colour. The largest speci- |