1890.] MARINE MOLLt'SCA OF ST. HELENA. 25.') 



iriiddle by the bluish-white irregular zone dotted and spotted with 

 olive-brown. The spire is either almost uniformly dark chestnut- 

 brown, or else white, blotched with that colour. 



Some small specimens, about | inch Ion?, which I believe to be 

 the young of this species, are still more brightly coloured, being 

 u)ore or less copiously blotched with brown-black ; and the spire is 

 radiately lined and spotted with the same tint. 



CoNus sp. ? 



A single much-worn shell is all that was obtained. In general 

 form it is very Uke C. tinianus, but seems to be thicker and more 

 strongly striated transversely. It is livid in colour, and marked 

 with longitudinal and transverse bands of an olive-brown tint, which 

 are not, however, sharply defined, but blend at the edges into the 

 ground-colour of the shell. The whorls of the spire are dark livid 

 on the upper half and pale beneath, forming a light spiral zone 

 which revolves up the spire above the suture. 



Pleurotoma (Clavus) AMANDA, Smith. (Plate XXI. fig. 1.) 



Pleurotoma (Glavus) amanda, Smith, Ann. & Mag. Nat. Hist 

 Sept. 1882, p. 207. 



The locality of this species was unknown at the time it was de- 

 scribed. The fresh specimens from St. Helena have the transverse 

 zone of a brighter tint, somewhat pinkish red. In certain examples 

 it is interrupted between the ribs, and occasionally a fine reddish 

 line occurs at the upper part of the whorls a little below the 

 suture. 



This species is very closely related to P. sinuosa, Montagu, and 

 may eventually prove to be merely a variety of it. 



Pleurotoma (Clavus) prolongata. (Plate XXIII. fig. 1.) 

 Testa elongata, iurrita, alba vel rubescens ; anfractus 6-7, duo 

 ajjicales Iceves, iiiagni, glohosi, serjuentes sujjerne vix concave de- 

 clives, in medio angidati, inferne couspicue contracti, costis obli- 

 quisjlexuosis circa 12 instructi ; apertura ixirva, brevis, longit. 

 totius § adcequans ; anfr. idtimns casta valida variciformi Jo'nge 

 jmie labrum munitus ; labrmn tenue, hand incrassatum ; sinus 

 profundus, magnum ; columella rectiuscida, callo tenui labro 

 jumta ; canalis brevissimus, latus. 

 Longit. 6 millim., diam. 2. 



This species is remarkable for the great length of the spire in 

 proportion to that of the aperture. Besides the ribs, the surface 

 exhibits fine wavy striie of growth. 



Pleurotoma (Clavus) albobalteata. (Plate XXI. fig. 2.) 



Testa parva^fusifonni-ovata, pallide fuscescens, circa medium anfr. 

 superiorum et ad hasim anfr. ultiini albida ; anfr. 6, jjrimi duo 

 Iceves, comexi, cceteri paulo excuvati, ad latera convexiusculi, 

 costis crassis 10-12 superne subobsoktis, ad suturas indistincte 



18* 



