12 BULLIA. 



Remarkable for its callous deposit upon the columella, which 

 sometimes is so thick as to give the shell a distorted appearance, 

 producing an angle or hump on the periphery. 



B. MAURITIANA, Gray. PI. 5, figs. 64, 65. 



Yellowish white, deeper yellow within the aperture; the callous 

 sutural band frequently opaque white. Length, 1-25-1-75 inches. 



Mauritius ; Madagascar. 



B. Mauritiana was not figured by Gray, and his description is 

 so unsatisfactory that the recognition of the species must rest 

 upon the illustration in Reeve's Iconica. With this, there is no 

 doubt that B. Grayi, Reeve (fig. 65), is identical. The babylonic 

 spire, strong sutural band of enamel, and distant revolving 

 incised lines distinguish this species. 



B. SEMIPLICATA, Gray. PI. 5, fig. 66. 



Whitish or yellowish, sometimes encircled by two broad, faint, 



brown bands. Length, 1 '25-1*5 inches. 



Habitat unknown. 



This has very much the form of the preceding species, but 

 the revolving incised lines are absent, and instead, the spire, :ind 

 frequently the upper portion of the body whorl are longitudinally 

 plicate. 



B. DIGITALIS, Meuschen. PL 5, figs. 67-69, 72. 



Cream-color to yellowish white, sometimes darker around the 

 suture ; orange-yellow within the aperture. Smooth, with obsolet e 

 spiral impressed lines near the base. In very large individuals 

 the whorls are somewhat plicately wrinkled next the suture. 



Length, 1-5-2-5 inches. 



South Africa. 



B. rhodostoma, Gray (fig. 69), is somewhat stouter than the 

 typical form, and B. semiusta. Reeve (fig. 68), is a mere color 

 variety. 



Var. NATALENSIS, Krauss. 



Whorls shortly plicate at the suture. 



The figure (fig. 72) represents a young specimen, but this 

 plicate condition persists, frequently, in the adults. I have one 

 before me, measuring 2'5 inches. t 



