100 



Sub-Family PIS ANTING. 



PISANIA, Bivona. Shell oblong ; spire prominent, whorls smooth or 

 spirally striated ; canal very short ; outer lip thickened and crenated. 

 Operculum ovate, nucleus apical. 



EUTHRIA, Gray. Shell fusiform, smooth ; aperture oval, produced 

 anteriorly into a long recurved canal ; inner lip simple ;' outer lip poste- 

 riorly sinuated, striate within. Operculum ovate," nucleus apical. 

 Dentition, PI. 27, figs. 27, 28. 



METULA, H. and A. Adams. Shell elongately fusiform, finely cancel- 

 lated; spire elevated, acute; aperture narrow; inner lip distinct, smooth; 

 outer lip thickened externally, crenulated within, emarginate poste- 

 riorly. Operculum unknown. Dentition, PI. 26, fig. 21. 



CANTHARUS, Bolten. Shell bucciniform, more or less ventricose in the 

 middle, narrowed anteriorly ; spire and aperture nearly equal ; colu- 

 mella generally with a few transverse ridges ; outer lip internally 

 crenated, and with a superior siphonal canal. Operculum ovate, nucleus 

 apical. Dentition, PI. 26, figs. 22, 23 ; PI. 27, fig. 26. 



Sub-Family BUCCININ^L 



BUCCINUM, Linn. Shell ovate or oblong, covered with a horny epider- 

 mis ; spire elevated, apex acute ; aperture large, oval,- emarginate in 

 front ; canal wide, very short, or a mere oblique truncation of the base 

 of the aperture ; columella smooth ; inner lip expanded ; outer lip 

 usually thin, smooth internally. Operculum ovate, nucleus small near 

 the outer front edge. Dentition, PI. 27, figs. 29, 30. 



NEOBUCCINUM, E. A. Smith. Shell bucciniform, smooth, thin ; aper- 

 ture obliquely, widely notched below. Operculum subspiral. Den- 

 tition resembling that of N~eptunea.* 



BUCCINOPSIS. Jeffreys. Shell bucciniform, smooth or spirally striu- 

 late, last whorl inflated ; aperture obliquely truncate below. Operculum 

 small, subtriangular, nucleus apical. Dentition, PI. 27, fig. 32. 



VOLUTHARPA, Fischer. Shell ventricose, thin ; spire short, body- whorl 

 and aperture very large. Operculum usually wanting ; when present, 

 at first with apical nucleus, afterwards becoming annular. Dentition, 

 PI. 27, fig. 31. 



* Mr. Smith founds his genus principally upon the paucispiral opercu- 

 lum, but the figure given by him shows an operculum which is no more 

 curved than occurs sometimes in the genus Sipho, for example. This, 

 with the dentition indicates relationship with Neptunea, but the absence 

 of canal in the shell on the other hand, relates it to Buccinum. 



