PLEUROTOMA. 



Plate XV. 



Species 120. (Mus. Cuming.) 



Pleurotoma collaris. Plcur. testd acuminato-pyrami- 

 dali, atrd; anfractibus prope saturmn unicarinatis, 

 infra serie unied granularum cinctis, anfractu ultimo 

 infer/ie granulifero, granulis seriatim digestis; carina 

 graindisque luteis; aperturd brevi, canali brevissimo, 

 lato. 



The collar-bound Pleurotoma. Shell acuminately 

 pyramidal, black ; whorls encircled with a keel 

 near the suture and a single row of granules below 

 it, lower part of the last whorl covered with rows 

 of smaller granules ; keel and granules yellow ; 

 aperture short, canal very short and broad. 



Sowerbt, Pro. Zool. Soc, 1S33. 



Hab. Bay of Caraccas, West Columbia (dredged from 

 muddy sand at the depth of eight fathoms) ; Cu- 

 ming. 



A little jet-black shell ornamented with a yellow keel, 

 and granules of the same colour. 



Species 121. (Fig. a & b, Mus. Cuming.) 



Pleurotoma tricarinata. Pleur. testd subovato-tur- 

 ritd, subventricosd, albd, striis elevatis transversis et 

 longitudinalibus exiliter decnssatd; anfractibus tri- 

 carinatis, carinis ultimi eminentioribus ; sinu pro- 

 fundi), latissim'e excavato ; canali brevi. 



The three-kf.eled Pleurotoma. Shell rather ovately 

 turrited, slightly ventricose, white, finely decussated 

 with transverse and longitudinal raised stria?; whorls 

 three-keeled, keels of the last whorl prominently 

 developed ; sinus deep, very widely excavated ; 

 canal short. 



Valenciennes MSS., Mus. Jardin des Plantes. 



Kiener, Iconographie, p. 64. pi. 23. f. 4. 



Hab. Island of Corrigidor, Philippines (dredged from 

 coarse sand at the depth of six fathoms) ; Cuming. 



This delicate little shell is remarkable on account of 

 the strong and very prominent development of the keels 

 upon the last whorl, and the pricked-like holes which are 

 formed by the crossing of the elevated stria?. The slit 

 or sinus forms a very curious, deep, rounded incision. 



Species 122. (Mus. Cuming.) 



Pleurotoma reticulata. Pleur. testd fusiformi-tur- 

 ritd, fuscescente, maculis irregularibus fitsciisve ob- 

 scurioribus purpureis variegatd; anfractibus rotun- 

 datis, coslis longitudinalibus lineisque transversis 

 elevatis distanlibus clathratis, papillis in angulis sec- 

 tionum acutis ; sinu lato ; canali brevi, recto. 



The reticulated Pleurotoma. Shell fusiformly tur- 

 rited, brown, variegated with irregular purple spots 

 or obscure bands ; whorls rounded, latticed with 

 longitudinal ribs and transverse elevated lines, 

 forming sharp papilla? at the angles ; sinus broad ; 

 canal short and straight. 



Bronn, Erg. nat. Reise, p. 555. 

 Murex reliculatus, Renieri. 



Variety j3. 



Testa pallidior, canali breviore, cost is fortioribus. 

 Shell paler, with the canal shorter, and the ribs stronger. 

 Pleurotoma Cordieri, Payrandeau. 



Variety y. 



Testa pallida, anfractibus superne subangulatis, papillis 

 spinosis. 



Shell pale, with the whorls rather angular round the up- 

 per part, and the papilla? spinous. 



Hab. Mediterranean. 



The spinous variety (var. y.) has been recently 

 dredged off the coast of Nice by Professor E. Forbes, at 

 the depth of from five to forty 7 fathoms. 



Species 123. (Fig. a & b, Mus. Cuming.) 



Pleurotoma lactea. Pleur. testd ovato-oblongd, tenui, 

 subinftatd, lacted, costis carinisve rotundulis striisque 

 exilibus cinc/d ; labro simplici, acuto ; sinu parvo ; 

 aperturd ovatd, canali brevissimo. 



The cream-coloured Pleurotoma. Shell ovately ob- 

 long, thin, rather inflated, cream-coloured, encir- 

 cled with delicate rounded keel-like ribs and stria? ; 

 lip simple and acute ; sinus small ; aperture ovate, 

 canal very short. 



Reeve, Pro. Zool. Soc, 1S43. 



Hab. Bolinao, Island of Luzon, and Gindulman, Island 

 of Bohol, Philippines (found under stones at low 

 water) ; Cuming. 



Julv 1343. 



