1890.] MARINE MOLLUSCA OF ST. HELENA. 2.^9 



0-6) j)07ie varices maxime elevatis instructa; anfractus circalO, 

 superne concavi, dein angulati, inferne constricti ; cifertura 

 parva, irregulariter ciixularis, margmihus fere continuis promi- 

 nentibus circumdata ; canalis mediocriter elongatus, angustus, 

 suhclausus, tortuosus, recumius. 

 Longit. 30 milUm., lat. 16. 



This species is remarkable for the prominent character of the 

 spiral ridges just behind the varices and the deep pits between them. 

 They are produced in a somewhat radiating manner, and form 

 tooth-like projections, giving the edge of the varices a pretty 

 festooned appearance. Although four varices can be counted in any 

 individual whorl, still, as the fourth from the labrum falls very 

 close but not exactly above it, and so on in the other whorls, three 

 disjointed varices are thus formed, and pass very obliquely up the 

 spire. 



MuREx (Ocinebra) patruehs. (Plate XXIII. fig. 6.) 



Tesia brevissisme fusiformis, dilute fuscescens, inferne vix 



rimata ; anfract. 7—8, convexi, in medio angulati, costis 



longitudinalibus circa 9, mediocriter fortibus, lirisque trans- 



versis, elevatis, sqiiamosis, inaqualibus {in anfr. penult. 5-(i, in 



ultimo circiter 13) instructi ; apertura eluiigatu, .subpjjriformis, 



longit. totius 2 adcBquajis,intiis j^ciUide fuscescens ; colmnella 



supra p arum arcuata, inferne oblique tor tuosa ; canalis brevis, 



recurvus. 



Longit. 10 millim., diam. max- (>|. jlpertura 5| longa, 2g lata. 



This little species is very like M. diadema of Aradas and Benoit, 



but has not the liration at the angle of the whorls produced into 



hollow spines upon the custse. The lirfe, also, are more numerous, 



and the nuclear whorls are differently sculptured. None of the few 



specimens at hand are quite mature, so I cannot state whether the 



labrum is smooth or denticulate within. 



MuREx (Ocinebra) alboangulatus. (Plate XXI. fig. 7.) 



Testa brevissime fusiformis, rufo- fuse a, ad angulum anfractuum 

 et basim anfr. ultimi alba; apex rvfescens ; anfr. 7, apicales 

 3 convexi, liris tenuissimis longitudinalibus numerosis,paucts- 

 que fransversis sculpti, cceteri superne declives, infra medium 

 acute angulati, costis crassis circa 10, lirisque fortibus spiral- 

 ibus squamulatis (in anfr. penult. 5, in ultimo ad W) instructi; 

 anfr. ultimus paulo infra medium contractus ; columella callo 

 albo incrassata ; apertura albida, longit. totius ^ subcequans ; 

 labrum incrassatum, intus denticulatum. 

 Longit. 8 millim., diam. max. Sg. 



This species has the general aspect of certain Coralliophilce, and 

 might be placed with that group provisionally until the animal and 

 opeculum are known. It diH'ers from M. patruelis in having smaller 

 apical whorls, in coloration, and in sculpture, the transverse or spiral 

 ridges being somewhat finer and more squamose. 



