94 CLAVATULINiE. 



Many of the Clamtulce bear a strong resemblance to the 

 genus Turris, but they may be readily distinguished by the 

 opercula, which are strikingly different. 



Species of Clavatula. 



bimarginata, Lam. mystica, Reeve. 



coronata, Chem. punctata, Reeve. 



diadema, Kien. sacerdos, Reeve. 



gravis, Hinds. taxus, Chem. 



imperialis, Lam. virginea, Chem. 

 implicata, Reeve. 



Genus PERRONA, Schumacher. 



Shell fusiform, smooth ; spire short, of few whorls ; 

 aperture narrow ; canal long; outer lip with a wide shallow 

 sinus near the middle ; inner lip with a thick callosity at 

 the hind part near the suture. 



Si/n. Tomella, Swain. 



Ex. P. lineata, Lamarck, pi. 10, fig. 6. Operculum, 

 P. lineata, fig. 6, a. 



The species of Perrona are smooth and solid shells, some- 

 what resembling in appearance small Clavellcz., with a notch 

 in the middle of the outer lip ; the hind part of the body- 

 whorl is gibbous, and the columella, as in that genus, is 

 callous posteriorly. 



Species of Perrona. 



lineata, Reeve. Perronii, Chem. 



obesa, Reeve. spirata, Lam. 



r: 



