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



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



Testa fusiformi-ovata, saturate fusca, interdum pallide fiavo 

 zonata ; anfractus 6,nuclearis corneus, convexus, Icevis, cceteri 

 convexiusculi, siitura profunde sejuncti, costis crassis ohliquis 

 circa 13, lirisque spiralihus, fortibus,' supra castas granosis {in 

 anfr.swperiorihus 3, in ultimo ad 9) cancellati; aperturaparva, 

 longit. totius k i''.r cequans ; lahrum incrassatum, intus denti- 

 culis senis munitum; columella leviter arcuata, callo tenui, 

 inferne ad canalem hrevem obliquum alba induta. 

 Longit. 7 minim., diam.max. 3g. Apertura 3^ longa, \\ 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. 



Cantharxjs (Tritonidea) albozonatus. (Plate XXI. fig. 9.) 



Testa Ireviter fusiformis, saturate purpureo-fusca, circa medium 

 anfractuum albo zonata, lirisque supra costas alio nodosis, 

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

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

 instructi ; lirae in anfr. superioribtis 3-4, ducB prope medium 

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

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

 labrumintus tenuiter liratum, liris elongatis, longe intrantibus, 

 Tiaud ad marginem attingenfibus ; canalis angustus, obliquus, 

 paulo recurvus ; columella supra medium arcuata, purpureo- 

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

 Longit. 16 millim., diam. max. 8. 



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

 centibus supra costas, prceter duas albas prope medium anfrac- 

 tuum, ornata. 

 Longit. 11 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 C. orbignyi 

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

 and in 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 transversis, 

 nif/rescentibus cincta; anfractus 8-9, apicales 3g conve.vi, 

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

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

 in anfr. penult imo 3-4, una ad suturas, una vel duce contiguee 



