OCR Text |
Show 2G0 MR. E. A. SMITH ON THE [Apr. 1, LACHESIS HELEN*. (Plate XXI. fig. 8.) Testa fusiformi-ovata, saturate fusca, interdum pallide jiavo zonata; anfractus 6,nuclearis corneus, convexus, Icevis, cceteri convexiusculi, sutura profunde sejuncti, costis crassis obliquis circa 13, lirisque spiralibus, fortibus,'supra costasgranosis (anfr. superioribus 3, in ultimo ad 9) cancellati; apertura parva, longit. totius | vix cequans; labrum incrassatum, intus denti-culis senis munitum; columella leviter arcuata, callo tenui, inferne ad canalem brevem obliquum albo induta. Longit. 7 millim., diam. max. 3j. Apertura 3j longa, 1| 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 (TRITONIDEA) ALBOZONATUS. (Plate XXI. fig. 9.) Testa breviter fusiformis, saturate purpureo-fusca, circa medium anfractuum albo zonata, lirisque supra costas albo nodosis, cincta; anfr. 7-8, superne concavi, deinde convexi, costis crassiusculis ad 8, et liris spiralibus, supra costas nodulosis, instructi ; lirce in anfr. superioribus 3-4, dues prope medium alba?, aliis majores, in ultimo 9-10; apertura elongate pyriformis, longit. totius ^ a?quans, intus lilacea, zona alba ornata labrum intus tenuiter liratum, liris elonyatis, longe intrant ibus, haud ad marginem attingentibus ; 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 fiaves-centibus supra costas, prceter duas albas prope medium anfractuum, 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. orbiynyi 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 luyubris, Jeffreys (non C. B. Adams), Melliss's St. Helena, p. 124. Testa fusiformi-ovata, pallide rufescens, liris transversis, nigrescentibus cincta; anfractus 8-9, apicales 3| convexi, la?ves, cateri superne concavi, in medio obtuse angulati, costis levibus circa 10, lirisque supra costas nodulosis, instructi; lira? in anfr. penultimo 3-4, una ad suturas, una vel duce contigui |