BUCCINID^. 143 



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

 riorly si nuated, striate within. Operculum ovate, nucleus apical. 



Metula, H. and A. Adams. 



Distr. — 4 sp. N. Zealand, Japan. M. clathrata, Ads. and 

 Rve. (1, 24\ 



Shell elongately fusiform, finely cancellated ; spire elevated, 

 acute ; aperture narrow ; inner lip distinct, smooth ; outer lip 

 thickened externally, crenulated within, emarginate posteriorly. 

 Operculum unknown. 



Cantharus, Bolten. 



Syn. — Pollia, Gray. Tritonidea, Swn. 



Distr. — 55 sp. All tropical and subtropical seas. C. Tran- 

 quebaricus, Grmel. (1, 25). G. distortus, Gray (1, 26). 



Shell bucciniform, more or less ventricose in the middle, 

 narrowed anteriorly ; spire and aperture nearly equal ; columella 

 generally with a few transverse ridges ; outer lip internally 

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

 nucleus apical. 



Swainson described a group Tritonidea, which Messrs. H. and 

 A. Adams make a subgenus under Cantharus, distinguishing it 

 from the typical form by " Shell tnrreted ; canal lengthened." 

 The distinction is altogether arbitrary, as the spire in the different 

 species varies considerably from the typical species of Cantharus 

 to much higher, but with no considerable break in the series, 

 whilst the canal can scarcely be called " lengthened" in any of 

 them. 



CANTHARULUs, Meek. Shell with canal moderately produced, 

 rather narrow and twisted ; inner lip smooth throughout, and 

 rather well developed ; columella arcuate and twisted, so as to 

 form an obtuse, undefined prominence below ; outer lip slightly 

 sinvious above. C. Vaughani, Meek and Hayden (li, 63). Cre- 

 taceous ; Upper Missouri River. 



Metulella, Gabb. 



Distr. — M. fusiformis^ Gabb (li, 64). Miocene; San Do- 

 mingo, W. I. 



Shell fusiform, canal more or less produced ; inner lip covered 

 with a thickened plate, continuous posteriorly with the outer 

 lip. Interior of both inner and outer lips strongl^^ denticulated 

 or transversely striated. Surface cancellate or costate. More 

 distinctly fusiform than Metula, the columella with a row of 

 denticles. 



Agasoma, Gabb. 



Distr. — A. sinuata^ Gabb (li, 65). Miocene; California. 



Subfusiform, spire low, body-whorl long ; canal moderately 



