GIBBULA. 431 



Sub-gen. solartella, Searles Wood. 



Shell thill ; whorls transversely finely striated ; umbilicus 

 perspective, the margin creaulated, no external striated callus. 



angulata, A. Adams. solariiformis, Sow. 



aureouitens, A. Adams. vitigilinea, Mice. 



delicata, A. Adams. 



Genus gibbula, Leach. 



Shell conoidal, usually umbilicated, the umbilicus cy- 

 lindrical or infundibuliform, whorls often superiorly gib- 

 bous ; aperture sub-rhomboidal, with rounded angles, 

 entire above, simple beloAV ; columella sometimes ending 

 in a tubercle or tooth. 



Si/ti. Phorcus, Ris.9o. Steromphala, Leach. 



Ex. G. Magus, Linnceiis, pi. 49, fig. 4. Operculum, 

 G. umbilicaris, Linnrens, fig. 4, a, 4, h. Shell G. Magus, 

 fig. 4, c. 



The species of Gibbula are very numerous, and are 

 found in all parts of the world ; the gibbosity of the whorls, 

 the perforated axis, and simple termination of the colu- 

 mella serve to characterise the genus. 



Species of Gihhda. 



Adansonii, Paijr. bicarinata, Adams and B^eve. 



Adriatica, Phil. bicincta, Phil. 



Agatliensis, Ueclnz. Candei, D'Orb. 



alveolata, Phil. Capensis, Gmel. 



amcEua, Goidd. cineraria, Linn. 



ai'dens, Sails. corvus, Phil. 



articulata, A. Adams. crinita, Phil. 



balteata, A. Adams. divaricata, Linn. 



