1890.] MARINE MOLLVSCA OF ST. HELENA. 255 



middle 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 long, which I believe to be 

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

 more 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 like C. tinianns, 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. I.) 



Pleurotoma {Clavus) 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 nf a brighter tint, somewhat pinkish red. In certain examples 

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

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

 suture. 



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

 may eventually prove (o be merely a variety of it. 



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

 Testa elongata, turrita, alba vel t-ubescens ; anfractus 6-7, duo 

 ajnccdes Iceves, magni, globosi, secjuentes superne vLv concave de- 

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

 quis jlexuosis circa 12 instructi ; apertura parva, brevis, longit. 

 totius 5 adcequans ; anfr. ultimus casta valida variciformi longe 

 p)one labrum munitus ; lahrum tenue, haud incrassatwin ; simis 

 profundus, magnus ; columella rectiuscula, callo tenui labro 

 juncta; 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 striaj of growth. 



Pleurotoma (Clavus) albobalteata. (Plate XXI. fi'^. 2.) 



Testa parva, fusiformi-ovata, pallide fuscescens, circa medium anfr. 

 superiorum et ad hasim anfr. ultiini albida ; anfr. 6, 2)rimi duo 

 la'ves, convexi, caferi paulo excavuti, ad latera convexiusculi, 

 costis crassis 10-12 superne subobsoletis, ad suturas iiidistincte 



18* 



