12 TROCHUS. 



Subfamily II. Gibbulin^e. 

 Genus GIBBULA Risso, 1826. 

 Shell usually perforate or umbilicate, conical, the spire moderate- 

 ly elevated ; whorls often gibbous or tuberculose beneath the sutures, 

 smooth or spirally ribbed ; the last generally angular at the periph- 

 ery ; aperture subrhomboidal ; columella oblique, dentate or sub- 

 sinuous at base ; outer li^) acute. Type G. magus L. 



Subgenus Gibbula (restricted.) 

 Section Gibbula. 



Shell nodulous or tumid beneath the sutures, spire elevated, um- 

 bilicated or imperforate, generally conspicuously painted with 

 longitudinal stripes of red or brown. 



European and Australian Seas ; Indian 0.; Red Sea. 



Section Eurytrochub Fischer. 



Shell small, spirally Urate, depressed, umbilicate; last whorl de- 

 flected toward the aperture ; aperture oblique rounded-quadrangular, 

 the terminations of the lips approaching, connected by a callus ; 

 outer and basal lips crenulated within. Type, G. danieli Crosse. 



Oceanica. 



Section Calliotrochus Fischer. 



Shell minute, turbinate, shining, narrowly perforated ; whorls 

 convex ; aperture subcircular. Type, G. phasianellus Desh. 



Indian 0. 



Subgenus Monilea Swainson, 1840. 

 Shell solid, depressed-conical, sharply striate and spirally lirate, 

 umbilicated, the umbilicus partly filled by a prominent spiral funicle 

 within it which terminates at the columella ; outer lip lirate within; 

 columella sinuous, terminating in a point or denticle at base. Type, 

 G. callifera Lam. Oceanica. 



Section Solanderia Fischer. 



Umbilicus narrow, columella arcuate, obliquely plicate, terminat- 

 ing in a strong anterior tooth. G. nucleus Phil. 



Subgenus Aphanotrochus Von Martens, 1880. 

 Shell conical, perforated ; columella with finely denticulated edge; 

 outer lip lirate within. Type, G. obscurus Wood. 



Indian Ocean. 



