320 



SHELLS AND SHELL-FISH. PART II. 



Costellaria Sw. Unequally fusiform ; the spire longer 

 than the aperture ; body-whorl slightly ventricose, 

 but suddenly contracted near the base ; internal striae 

 distinct ; whorls convex, rarely angulated ; the ribs 

 reaching to the suture, (fig. 84. d.) 



C. rigida. Zool. 111. 1st Series, pi. 29. 



Callithea Sw. Spire and aperture of nearly equal length ; 

 internal' channel nearly obsolete ; shell with longi- 

 tudinal linear ribs, crossed with transverse striae and 

 bands ; base contracted, (fig. 84. e.) 

 sanguisuga. En. Meth. 373. stigmataria. Chem. 151 . f. 1442, 

 f. 10. 1443. 



Cancilla Sw. General shape of the last ; but the whorls 

 crossed by transverse linear ribs, or elevated ridges ; 

 internal canal wanting ; plaits very oblique ; form 

 slender ; outer lip thin. (fig. 84. &,) 

 Isabella. Zool. 111. ii. pi. 50. sulcata. Ib. pi. 50. f. 2. 



Pusia Sw. Size very small ; spire thick, obtuse ; 

 outer lip thickened, and often reflected ; aperture 

 striated, with an internal canal. 



microzonis. En. Meth. 374. f. 8. 



MITREOLA Sw. Small ; unequally fusiform ; the base 

 obtuse ; inner lip, typically, thickened, inflected, and 

 either toothed or tuberculated ; plaits on the pillar 

 distinct, the inferior largest ; tip of the spire some- 



