PLEUROTOMA— Plate III. 



not keeled ; whorls slightly convex, encircled round 

 the middle with a small zone ; canal rather long. 

 Doumet, Magasin de Zoologie, Mollusques, 1834. 

 Hab. China, Doumet. 



This is the only shell I can at all identify with Dou- 

 met's Pleurotoma Deshayesii ; it is of an uniform pale 

 brown colour, and comparatively smooth throughout, 

 the whorls being but faintly grooved and belted round 

 the middle by the filling up of the labral slit. 



Species 20. (Mus. Stainforth.) 

 Pleurotoma virgo. Pleur. testd solidd, rectd, fusiformi, 

 transversim striatd et carinatd ; albd, immaculatd, 

 epidermide flavido-brunned indutd ; canali lato, elon- 



gato. 



The virgin Pleurotoma. Shell solid, straight, fusi- 

 form, transversely striated and carinated ; white, 

 unspotted, covered with a yellowish-brown epider- 

 mis ; canal broad, and rather long. 



Lamarck, Anim. sans vert., vol. vii. p. 94. 

 Turris nivea, Martini, Conch., vol. iv. 

 Murex virgo, Wood. 



Hab. ? 



This shell, which has been vulgarly called the White 

 Tower of Babel, is rarely to be seen with its rich epi- 

 dermis. I have no authority for its habitat. 



Species 21. (Mus. Stainforth.) 



Pleurotoma marmorata. Pleur. testd turritd, fusi- 

 formi, transversim striatd et carinatd, albd, rubido- 

 fusco aut maculatd, aut marmoratd, canali plus mi- 



nusve elongato ; fissurd valde profundd. 

 The marbled Pleurotoma. Shell turrited, fusiform, 



transversely striated and carinated, white, either 



spotted or marbled with reddish-brown ; canal 



more or less elongated ; slit very deep. 



Fig. a, var. maculata. 



Fig. b, var. marmorata. 

 Lamarck, Anim. sans vert., vol. vii. p. 95. 

 Hab. Straits of Malacca. (In coarse sand at the depth 



of ten fathoms.) Cuming. 

 I have figured very extreme specimens of the two 

 varieties above noted, in order to show how variable is 

 this species both in form and in painting. 



