256 MR. E. A. SMITH ON THE [A.pr. 1, 



subnodosis {in anfr. ult. infr. medium enanidls) instructi ; aper- 

 turaparva, longit. totius i haud cequans ; labrum ad marginem 

 tenue, casta ultima valida extus incrassatum, superne leviter 

 sinuatum. 

 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 por- 

 tion 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 hreviter fusiformis, Jlavescens, inter castas fusco tincta, infra 

 suturas alba, circa anfr. ultimi medium albo zonata ; anfr. 10|, 

 primus convexus, Icevis, duo sequentes in medio carinati, cceteri 

 superne concavi, deinde convexi, costis brevibus circiter 12 sw- 

 perne obsoletis lirisque spiralibus 4-6 inter castas fuscis decus- 

 sati, infra suturam corrugati ; anfr. idtimus inferne contractus ; 

 apertura angusta, longit. totius | paulo minor ; labrum ad mar- 

 ginem tenue, extus casta variciforme arcuata incrassatum, intus 

 denticulatum ; columella alba, denticidis transversis pluribus 

 munita ; sinus profundus ; canalis brevis, i-ecurvus. 

 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 costse are not constantly red alternately, as some of these 

 examples have all of them of a reddish colour. The largest speci- 



