PART II. COLUJIBELLIN^. 313 



lip doubly toothed^ i. e. internally and externally ; 

 aperture narrow, generally ringent ; operculum minute. 



CoNiDEA Sw. Mitra-shaped, fusiform ; spire equal or 

 longer than the aperture; the whorls tumid ; outer 

 lip slightly gibbous above, contracted below ; margin 

 not inflected ; striated within ; inner lip terminating 

 in an elevated ridge, but with the teeth obsolete. 



C. semipunctata. (Columhella Lam.) Mart. 44. f. 465,466. 



CoLUMBELLA Lum. Subfusiform ; spire shorter than 

 the aperture ; outer lip gibbous, inflected, sinuated, 

 broad, and thickest in the middle, crenated or toothed 

 its entire length ; aperture contracted ; inner lip with 

 granular teeth. 



C. mercatoria. Mart. pi. 44. 452 — 458. 



PusiosTOMA Sw. General form of Columhella ; but the 

 outer lip is only toothed in the middle, where it is 

 greatly thickened ; inner lip convex between the gra- 

 nular teeth, (fg, 72. g, h.) 



punctata. En. M. 374. f. 4. fulgurans. Lam.* 

 mendicaria. lb. 375. f. 10. turturina. En. M. 384. f. 2. 



Crassispira Sw. Small, subclavate, tuberculated : spire 

 thick, lengthened ; outer lip with a slight sinus 

 above, and thickened internally at the top and bottom ; 

 top of the inner lip with a thick pad ; basal channel 

 but slightly defined, (fig. 17. a.) 



Pleurotoma Bottas Auct. C. fasciata Sw. {fig. 17. d, p. 151.) 



NiTiDELLA Sw. Bucciniform ; small, ovate, smooth, 

 glassy ; aperture effuse ; outer lip slightly thickened, 

 faintly inflexed, and generally striated internally ; 

 inner lip somewhat flattened above ; base of the pillar 

 with one or two slight internal folds, or a single an- 

 gular projection, (fig. 17- e.) 



Columbella nitida Lam. (fig. 17. c, p. 151.) 



* Lamarck erroneously cites the Ency. Meth. 574. fig. 7. for this species, 

 as that represents one of his Mitres. 



