260 MR. E. A. SMITH ON THE [Apr. 1, 



Lachesis HELENA. (Plate XXI. fig. 8.) 



Testa fusiformi-ovata, saturate fusca, interdum pallide Jlavo 

 zonata; anfractus &,nuclearis corneus, convexus, Icevis, cceferi 

 convexiusculi,sutura profunde sejuncti, costis crassis ohJiquis 

 circa 1 3, lirisque spiralihus, fortihus,' supra castas f/ranosis (in 

 anfr.superioribusS, in ultimo ad 9) cancellati; apertura parva, 

 longit. totius | vix ccquans; labrum incrassatum, intus denti- 

 culis senis munitum ; columella leviter arcuata, callo tenui, 

 inferne ad canalem hrevem ohliquum alba induta. 

 Longit. 7 millim., diam.max. Sj. Apertura 3g longa, Ig lata. 

 This species is broader than most of the European forms. Of the 

 three lirae upon the upper whorls, the uppermost is rather more 

 slender than the other two. A fourth liration is occasionally visible 

 at the lower part of the whorls. The oblique ribs are more or less 

 regularly continuous up the spire. 



Cantharus (Triton idea) albozonatus. (Plate XXI. fig. 9.) 



Testa breviter fusiformis, saturate puipureo-fusca, circa medium 



anfractuum albo zonata, lirisque supra costas albo nodosis, 



cincta ; anfr. 7-8, sttperne concavi, deinde convexi, costis 



crassiusculis ad 8, et liris spiralibus, supra costas nodulosis, 



instructi ; lirce in anfr. superioribus 3-4, duce prope medium 



albcB, aliis majores, in ultimo 9—10; apertura elongate pyri- 



formis, longit. totius h cequans, intus lilacea, zona alba ornata ; 



labrumintus tenuiter liratum, liris elongatis, longe intrantibus, 



Tiaud ad marginem attingentibus ; canalis angustus, obliquus, 



paulo recurvus ; columella supra medium arcuata, purpureo- 



fusca, callo tenui, superne tuberculata, munita, inferne alba. 



Xiongit. 16 millim., diam. max. 8. 



Var. Testa brevior, saturate purpureo-fusca, nodulis faves- 

 centibus supra costas, prceter duas albas prope medium anfrac- 

 tuum, ornata. 

 Longit. 1 1 millim., diam. max. 6. 



This species varies considerably in form and colour. The smaller 

 variety has the ribs rather more numerous and is of much stumpier 

 growth, but the series of specimens at hand is sufficiently large to 

 clearly connect the two varieties. The Mediterranean G. orbignyi 

 is a larger shell, has the white zone lower down, and differs in colour 

 and iu the aperture. 



Cantharus (Tritonidea) consanguineus. (^Plate XXI. 

 fig. 10.) 



Cominella lugubris, Jeffreys (non C. B. Adams), Melliss's St. 

 Helena, p. 124. 



Testa fusiformi-ovata, pallide rufescens, liris fransversis, 

 nigrescentibus cincta; anfractus 8-9, apicales 3| convexi, 

 Iceves, cceteri superne concavi, in medio obtuse angulati, costis 

 levibus circa 10, lirisque supra costas nodulosis, instructi; lirce 

 in anfr. penuUimo 3-4, una ad suturas, una vel duee contiguce 



