Zoological Society. 299 



Plettrotoma Harfordiana. Pleur. testd obeso-pyramidali ; an- 

 fractibus nigerrimis, in medio luteo-halteutis, convexis, transversim 

 subtilissimc striutis, superne depressiusculis, serie unicd nodulorum 

 ornatis, infrii noduloso-costatis ; aperturd breviusculd ; sinu parvo, 

 I'otundato. 

 Conch. Icon., Pleurotoma, pi. 11. f. 93. 



Pleurotoma Perronii. Pleur. testd fiisiformi, turritd, Iceviusculd, 

 pallide luted ; anfractibus planis, svperne leviter angiilatis, ultimo 

 inferiie coarctato, transversim lirato, liris rcgularibus, subdistan- 

 tibus ; sinu subcentrali ; ccmali subelongato, recto. 

 Conch. Icon., Pleurotoma, pi. 11. f. 94. 

 Mtirex Perron, Chemnitz, Conch., vol. x. pi. 164. f. 1.573. 

 This interesting shell has been confounded h\ Lamarck with the 

 P. spirata. It differs from that species in being more erect and fu- 

 siform, in the sutures of the whorls being less deeply channeled, and 

 in the lower portion of the last whorl being crossed with about four 

 or five narrow, well- developed ridges. 



Pleurotoma pluteata. Pleur. testd fxisiformi, gracili, fulvd ; 

 anfractibus convexis, pluteo superne ornatis, medio nodtdis albidis 

 catenulatis, infn) subtilissime sulcatis ; sinu lato ; canali elongato. 

 Conch. Icon., Pleurotoma, pi. 12. f. 101. 



The shelf which passes round the upper portion of the whorls is 

 not less characteristic of this species than the delicate chain of white 

 nodules which encompass the centre. 



Pleurotoma mystica. Pleur. testd abbreviato-fusiformi, rubido- 

 fuscd ; anfractibus superne concavis, striatis, infrii angulatis, tu~ 

 berculis albis, connatis, ad angulum acute carinatis ; nnfractu 

 ultimo inferne nodulorum seriebus plurimis cingulato. 

 Conch. Icon., Pleurotoma, pi. 12. f. 107. 

 Chiefly distinguished by the white turreted keel. 

 Pleurotoma Philippinensis. Pleur. testd ov at o -turritd, ventri- 

 cosd, subpellucidd , albidd; anfractibus sex septemve, longitudina- 

 liter costatis, costis eximiis, subcompressis, subdistantibus, nigro 

 aut fusco alboque varie pictd ; transversim liratis, liris minutis, 

 subcontiguis, numerosis ; columelld subtortuosd ; aperturd ovatd, 

 ampld ; ca?iali brevissimo. 

 Conch. Icon., Pleurotoma, pi. 13. f. 109. 



Hah. Islands of Masbate and Luzon, Philippines (found under 

 stones at low water) ; Cuming. 



Pleurotoma Rissoides. Pleur. testd elongato-ovali, Iccvi, nitente, 

 semipellucidd, albicante,fulvo pallidissime nebulose strigutd ; an- 

 fractibus septem, tribus longitudinaliter plicatis ; apice rubello ; 

 columelld spiraliter tortuosd ; canali brevissimo, leviter recurvo ; 

 labro subincrassato, inttis eximie denticulato, sinu parvo, distincto. 

 Conch. Icon., Pleurotoina, pi. 13. f. 111. 



This species reminds me somewhat of the Rissoa deformis ; the first 

 whorl or two are plaited as in that shell, the surface is moreover 

 smooth and sliining, and they bear a general resemblance to each 

 other in size. The apex of this shell is peculiar in being pink, whilst 

 there is not the least indication of that colour in any other part. 



X2 



