P L E U R T M A. 



Plate VIII. 



Species 60. (Mus. Cuming.) 



Pleurotoma splendidula. Pleur. testa elongato-py- 

 ramidali, roseo-fuscescente ; anfractibus leevigatis ; 

 longitudinaliter costatis, costis obliquis, medio promi- 

 nulis, subconfertis, albis; (infract ds ultimi dorsofuseo, 

 planulato ; sinu lato. 



The splendid Pleurotoma. Shell elongately pyra- 

 midal, brownish rose-colour ; whorls smooth, longi- 

 tudinally ribbed, ribs oblique, prominent in the 

 middle, rather close, white ; back of the last whorl 

 dark, smooth ; sinus broad. 



Sowerby, Pro. Zool. Soc, 1833, p. 135. 



Hab, Gallapagos Islands ; Cuming. 



The burnt rose-colour which appears between the 



longitudinal ribs, and on the back of the last whorl, is of 



very peculiar character. 



Species 61. (Mus. Cuming.) 



Pleurotoma pica. Pleur. testd crassd, obtuso -pyrami- 

 duli, idbd, muculis fuscis, panels, grandibus, subgua- 

 dratis, irregularis rvariegatd; anfractibus eleganter 

 semicoslatis , costis angustis, numerosis ; supern'e hevi- 

 bus, concavis ; sinu lato. 



The pied Pleurotoma. Shell thick, obtusely pyrami- 

 dal, white, irregularly variegated with a few large 

 squarish brown spots ; whorls elegantly ribbed 

 half-way up, ribs numerous and narrow ; upper 

 portion of the whorls smooth and hollowed out as 

 it were ; sinus broad. 



Reeve, Pro. Zool. Soc, 1843. 



Hab. Island of Capul, Philippines ; Cuming. 



A very solid white shell, pied here and there with dark 

 brown blotches. 



Species 62. (Mus. Cuming.) 



Pleurotoma albicostata. Pleur. testd acuminato-py- 

 ramidali, rosed ; anfractibus bevibus, longitudinaliter 

 costatis, costis confer lis, albis ,■ aperturd brevi. 



The white-ribbed Pleurotoma. Shell acuminatcly 

 pyramidal, rose-colour ; whorls smooth, longitudi- 

 nallv ribbed, ribs white and closely set ; aperture 

 short. 



Sowerby, Pro. Zool. Soc, 1833, p. 135. 



Reeve, Conch. Syst., vol. ii. pi. 234. f. 13. 



Hab. Gallapagos Islands ; Cuming. 



The white ribs in this shell appear in bold relief upon 

 a bright rose-coloured ground. 



Species 63. (Mus. Stainforth.) 



Pleurotoma tuberculifera. Pleur. testd acuminato- 

 fusiformi, apice acuto; anfractibus medio tuberculi- 

 fcris, stria/is, svperne concavis, fusco-fasciatis; canali 

 mediocri ; labro simplici, acuto, ab anfractu penultimo 

 sinu lato separate 



The tuberculous Pleurotoma. Shell acuminatcly 

 fusiform, apex sharp ; whorls tuberculous in the 

 middle, striated, concave and brown-banded above ; 

 canal middling ; lip simple, acute, separated from 

 the penultimate whorl by a broad sinus. 



Broderip and Sowerby, Zool. Journ., vol. iv. p. 378. 



Hab. Isabella Island, Gulf of California; Belcher. 



The whorls in this shell have a peculiar dark chest- 

 nut band above the tubercles, and a lighter divided one 

 below them. It is not much unlike the PL olivacea. 



Species 64. (Mus. Belcher.) 



Pleurotoma inermis. Pleur. testd ovato-acuminatd, in- 

 eriui; anfractibus leviter convexis, cinereis , fammeolis 

 fuscis, subtilissimis, undosis, longitudinaliter striatis. 



The unarmed Pleurotoma. Shell ovately acuminated, 

 smooth ; whorls slightly convex, ash-coloured, 

 longitudinally striated with a succession of very 

 fine, waved, flame-like lines. 



Hinds, Pro. Zool. Soc, 1*4-'!. 



Hab. Bay of Magdalena, California (found in mud at the 

 depth of seven fathoms) ; Hinds. 



I have not ventured to describe the anterior portion of 

 this shell, because the specimen before me collected by 

 Capt. Belcher, the only one that has yet been seen, has 

 not arrived at maturity. It is very properly placed by 

 Mr. Hinds in the genus Pleurotoma ; for, although the 

 lip is considerably broken, the very peculiar marking of 

 the whorls fully indicates the previous existence of a si- 

 nus or fissure. 



Species 65. (Mus. Cuming.) 



Pleurotoma alabaster. Pleur. testa turritii, intiis ex-- 

 tusque nived, roseo interdum leviter tinctd, transveriim 



March 1843. 



