PLEUROTOMA.— Plate XVIII. 



of equal length, fully shows that the extensive division 

 of club-shaped Pleurotoma? should not be allowed to 

 rank as a separate genus. 



Species 151. (Mus. Belcher.) 



Pleurotoma i'lumbea. Pleur. testa ovato-fusiformi, 

 pallide plumbed, fuscescente fasciatd; anfractibus 

 convexis, longitudinaliter costatis, costis numerosis, 

 rotundalis, suturam simplicem incurrentibus ; labro 

 tenui, acuto ; canali mediocri. 



The lead-colour Pleurotoma. Shell ovately fusi- 

 form, pale lead-colour, banded with light brown ; 

 whorls convex, longitudinally ribbed, ribs nume- 

 rous and rounded, running into a simple suture ; 

 lip thin, sharp ; canal middling. 

 Clavatula plumbea, Hinds, Pro. Zool. Soc, 1843. 



Hub. Bay of Magdalena, California (found at the depth 

 of five fathoms) ; Hinds. 



Though a fragile shell, it is of a dull, heavy cast of 

 colour. 



Species 152. (Mus. Belcher.) 



Pleurotoma stolida. Pleur. testd fusiformi, laevigata, 

 corned, olivaceo-fuscd ; anfractibus superne depresso- 

 planis, infra tuberculato-costatis, costis albidis, bre- 

 vibus, obliquis, antic'e evanidis ; apice papillari ; 

 labro simplici, acuto, sinu lato ; canali breviusculo. 



The dull-looking Pleurotoma. Shell fusiform, 

 smooth, horny olive -brown ; whorls flatly depressed 

 at the upper part, tuberculously ribbed beneath, 

 ribs whitish, short, oblique, disappearing anteriorly ; 

 apex papillary ; lip simple, sharp, sinus broad ; ca- 

 nal rather short. 



Hinds, Pro. Zool. Soc, 1S43. 



Hab. Lagulhas Bank, Cape of Good Hope (dredged 

 from the depth of forty-three fathoms) ; Hinds. 



Care should be taken not to confound the PI. stolida 

 with the PI. semicostata (Species 67), both of which are 

 from nearly the same locality, and have the same horny 

 appearance. 



Species 153. (Mus. Belcher.) 



Pleurotoma Sinensis. Pleur. testd plus minusve fusi- 

 formi, acuminatd ; anfractibus numerosis, convexis, 

 longitudinaliter costatis, lineis elevutiusculis decus- 

 satis ; costis confertis, subobliquis ; suturd granoso- 

 carinatd ; labro simplici, acuto, sinu lato, profunda ; 

 canali nunc elongato, nunc breviusculo recurvo. 



The Chinese Pleurotoma. Shell more or less fusi- 

 form, acuminated ; whorls numerous, convex, longi- 

 tudinally ribbed, and crossed with rather elevated 

 lines ; ribs close and rather oblique ; suture granu- 



lously keeled ; lip simple, acute, sinus broad and 

 deep ; canal sometimes elongated, sometimes rather 

 short and recurved. 



Clavatula Sinensis, Hinds, Pro. Zool. Soc, 1843. 

 Hab. New Guinea, Straits of Macassar, China Sea (found 

 in mud at the depth of from five to twenty-one fa- 

 thoms) ; Hinds. 



This species is remarkable for the variable length of 

 the canal : some specimens ma)' be referred to the nor- 

 mal division of the genus with as much propriety as 

 others to the Clavatula division. 



Species 154. (Mus. Belcher.) 



Pleurotoma sculpta. Pleur. testa- elongato-turritd, 

 acuminatd, tenui, fulvd , fuscescente fasciatd ; anfrac- 

 tibus planiusculo- convexis, longitudinaliter costatis, 

 lineis elevutiusculis subtilibus decussatis ; costis ro- 

 tundalis, subcompressis, prope suturam desinentibus ; 

 labro tenui, acuto ; canali breviusculo. 



The carved Pleurotoma. Shell elongately turrited, 

 acuminated, thin, yellowish, banded with light 

 brown ; whorls rather flatly convex, ribbed longitu- 

 dinally, crossed transversely with fine raised lines ; 

 ribs rounded, rather compressed, leaving off near 

 the suture ; lip thin, sharp ; canal rather short. 

 Clavatula sculpta, Hinds, Pro. Zool. Soc, 1843. 



Hab. Panama (found in mud at the depth of about seven 

 fathoms) ; Hinds. 



A light neatly carved shell of which Mr. Hinds only 

 met with the single specimen here figured. 



Species 155. (Mus. Belcher.) 



Pleurotoma l.eta. Pleur. testd subclavatd, albidd, po- 

 litd ; anfractibus superne depresso-planis, infra tu- 

 bercu/is grandibus prominentibus erectis uniseriatim 

 cinctis ; anfractu ultimo tuberculorum serie duplici 

 cingulato, tuberculis inferioribus valde minoribus ; 

 labro acuto, sinu profundo ; canali brevissimo, sub- 

 recurvo. 



The merry Pleurotoma. Shell somewhat club-shaped, 

 white, polished ; whorls depressly flat at the upper 

 part, encircled beneath with a single row of large 

 prominent erect tubercles ; last whorl encircled with 

 a double row of tubercles, the lower of which are 

 much the smaller ; lip sharp, sinus deep ; canal 

 vrrv short, a little recurved. 

 Clavatula lata, Hinds, Pro. Zool. Soc, 1843. 



Hab. New Guinea and Straits of Macassar (dredged 

 from the depth of from seven to ten fathoms) ; 

 Hinds. 



Chiefly characterized by its sharp erect tubercles. 



