300 Zoological Society. 



Pleurotoma Boholensis. Pleur. testd subelongatd, tenui, sub- 

 pellucidd, albidd, fulvo subindistincte virgatd; anfractibus octo, 

 transversim lineatis et liratis, striis quoque subtilissime reticulatis ; 

 columella spiraliter tortuosd; canali brevissimo, paululum recurvo ; 

 labro simplici, acuto, sinu parvo. 

 Conch. Icon., Pleurotoma, pi. 13. f. 112. 



Hab. Island of Bohol, Philippines (found under stones on the reefs 

 at low water) ; Cuming. 



This shell, which is of a much thinner and slighter composition 

 than either of the two preceding ones, is very finely reticulated over 

 with striae ; and it has a number of lines and ridges running trans- 

 versely across the whorls, but none longitudinally. 



Pleurotoma gracilenta. Pleur. testd gracillimefusiformi,fulvd, 

 anfractibus convexis, longitudinaliter costellatis, costellis leviter 

 nodulosis, striis elevatiusculis transversis decussatis ; labro sub- 

 flexuoso, sinu lato ; canali breviusculo. 

 Conch. Icon., Pleurotoma, pi. 14. f. 114. 



Hab. Loay, island of Bohol, Philippines (dredged from sandy mud 

 at the depth of seventeen fathoms) ; Cuming. 



A shell of simple character, unlike any hitherto-described species, 

 though not presenting any very striking peculiarity. 



Pleurotoma pessulata. Pleur. testd subacuto-fusiformi, fulvd 

 vel cinered, anfractibus leviter convexis, longitudinaliter costatis, 

 costis subdistantibus, striis transversis subobsoletis decussatis; 

 labro tenui, sinu parvo ; canali breviusculo, subrecurvo. 

 Conch. Icon., Pleurotoma, pi. 14. f. 115. 



Hab. Bolinao, island of Luzon, Philippines (dredged from sandy 

 mud at the depth of ten fathoms) ; Cuming. 



Although the ribs in this species are comparatively distant from 

 each other, they vary considerably in this respect in different indi- 

 viduals ; the more elongated the shell, the closer the ribs, as shown 

 by the specimens figured. 



Pleurotoma contracta. Pleur. testd elongato-ovatd, albidd; an- 

 fractibus piano -convexis, superne contractis, costellis longitudina- 

 libus numerosis, striisque transversis elevatis eximie reticulatis ; 

 sinu lato, canali brevi. 

 Conch. Icon., Pleurotoma, pi. 14. f. 116. 



Hab. Cagayan, province of Misamis, island of Mindanao, Philip- 

 pines (dredged from sandy mud at the depth of twenty-five fathoms) ; 

 Cuming. 



This species may be recognized by the peculiar contraction of the 

 whorls near the suture ; the sculpture is not much unlike that of the 

 C. gracilenta. 



Pleurotoma cedo-nulli. Pleur. testd lanceolato-fusiformi, eximie 

 turritd, apice acuto ; griseo-albicante ; anfractibus in medio valde 

 carinatis, carind compressd, pereleganter diadematd ; sinu amplo, 

 canali longissimo. 

 Conch. Icon., Pleurotoma, pi. 14. f. 117. 



Hab. Bay of Panama (found in sandy mud at the depth of ten 

 fathoms) ; Cuming. 



