PLEUROTOMA. 



Plate XVIII. 



Species 146. (Mus. Belcher.) 



Pleurotoma bella. Pleur. testd fusiformi, basi attenu- 

 atd, gracili, pallid? cteruleo-fuscd ; anfractibus ro- 

 tundatis, longitudinaliter costulatis, lineis albidis cle- 

 vatis decussatis, super nefusco fascia/ is ; costulis gra- 

 cilibus, granulis parvis sparsis instructis, suturam 

 simplicem incurrentibus ; labru incrassato, sinuparvo, 

 latiusculo ; canali brevi, attenuato-recurvo. 



The pretty Pleurotoma. Shell fusiform, attenuated 

 at the base, slender, pale bluish brown ; whorls 

 rounded, longitudinally ribbed, crossed with white 

 raised lines, banded with darker brown round the 

 upper part ; ribs slender, furnished with small scat- 

 tered granules, running into a simple suture ; lip 

 thickened, sinus small, rather wide ; canal short, 

 attenuately recurved. 

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



Hab. West Coast of Veragua, and Gulf of Papagayo, 

 Central America (found in mud at the depth of 

 from eight to thirty fathoms) ; Hinds. 



A very interesting species, highly deserving the name 

 assigned to it. 



Species 147. (Mus. Belcher.) 



Pleurotoma pyramis. Pleur. testd elongato-pyrami- 

 dali, antie'e subclavatd ; albd, ungulate, custatd, hexa- 

 gond, transversim creberrime striata, costis confiuen- 

 tibus, acutis ; labro incrassato, sinu lata, subsuperfi- 

 ciali ; aperturd parvd, canali brevissimo. 



T'h e pyramid Pleurotoma. Shell elongately pyra- 

 midal, somewhat club-shaped anteriorly ; white, an- 

 gularly ribbed, six-sided, transversely very closely 

 striated, ribs sharp, flowing one under the other ; 

 Up thickened, sinus broad and rather superficial ; 

 aperture small, canal very short. 

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



Hab. Straits of Macassar ; Hinds. 



This shell may be recognized by the hexagonal form 

 that it receives from the subsecutive disposition of the 

 ribs. 



Species 148. (Mus. Belcher.) 



Pleurotoma merita. Pleur. testa ovatd, acuminata- 

 turritd, lecviyatd, luteold ; anfractibus phcato-costa- 

 tis, superne angulatis, lined fused spiraliter cinctis, 



costis antice evanidis ; anfractAs ultimi dorso fusco 

 nebuloso, transversim slriato ; labro subincrassato ; 

 canali brevissimo. 



The deserving Pleurotoma. Shell ovate, acuminately 

 turrited, smjoth, yellowish; whorls plicately ribbed, 

 angulated next the suture, spirally encircled with a 

 brown line; ribs disappearing anteriorly; back of 

 the last whorl clouded with brown, transversely 

 striated ; lip somewhat thickened ; canal very short. 

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



Hab. Gulf of Nicoya, Central America (found under 

 stones at low water) ; Hinds. 



The brown hair-line running around the angle of the 

 whorls is a very peculiar feature in this shell. 



Species 149. (Mus. Belcher.; 



Pleurotoma luctuosa. Pleur. testd ovatd, solidd, 

 acuminatd, intus extusque nigerrimo-fuscd ; anfrac- 

 tibus IcBvigatis, superne plaiiiusculis, tuberculis minu- 

 tisprope medium uniseriatim cinctis ; labro incrassato , 

 si a it lato ; canali brevi. 



The mournful Pleurotoma. Shell ovate, solid, acu- 

 minated, dark blackish brown within and without ; 

 whorls smooth, rather flat at the upper part, encir- 

 cled with a single row of minute tubercles near the 

 middle ; lip thickened, sinus broad ; canal short. 

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



Hab. Bay of Guayaquil, and Gulf of Magdalena, Cali- 

 fornia (found at the depth of from five to twenty- 

 two fathoms) ; Hinds. 



A sombre-looking but very characteristic species. 



Species 150. (Mus. Belcher.) 



Pleurotoma polita. Pleur. testd fusiformi, albd, po- 



litti, angulate costatd, septanguld, costis confluentibus ; 



labro simplici, acuto, sinuparvo; canali subelongato. 

 The polished Pleurotoma.' Shell fusiform, white, 



polished, angularly ribbed, seven-sided, ribs flowing 



one under the other ; lip simple, sinus small ; canal 



rather long. 



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

 Hub. Straits of Macassar (found in coarse sand at the 



depth of seven fathoms) ; Hinds. 



This fusiform species, in which the canal and spire are 



December 1843. 



