220 MANITAL OF THE MOLLUSCA. < 



Type, P. plumbea. PL V., Fig. 12. 



Shell globular, thick ; witli a deep spiral furrow near tlie 

 front of tho body-whorl, forming, as in monoceros, a small tooth 

 on the outer lip ; spire short, acute ; suture channelled ; inner 

 lip callous ; aperture notched in front ; operculum ? Animal 

 unknown. 



Distrilution, 6 species. Africa and California. 



Fossil, 6 species. Eocene. Britain, France, Chili. 



PAnolax (Eoissy), Conrad, Lea. 



Etymology, an aulax, without furrow. 



Synonyms, Buccinanops, D'Orbigny. Leiodomus, Sw. BuUia, 

 Gray. 



Types, A. gigantea, Lea. Bug. Isevigatum. B. semiplicata, 

 PL v., Fig. 14. 



Shell variable ; like buccinum, pseudoliva, or terebra ; sutures 

 enamelled ; inner lip callous. 



Animal without eyes ; foot very broad ; tentacles long and 

 slender ; operculum pointed, nucleus apical. 



Distribution 26 species. Brazil, West Africa, Ceylon, Pacific 

 Western America. 



Fossil, 3 species. Eocene — . North America, France. 



? Halia, Bisso. 



Etymology, halios, marine. 



Synonym, Priamus, Beck. 



Types, bulla helicoides (Brocchi). Miocene, Italy. Helix 

 priamus (Meuschen). Coast of Guinea ? 



Shell like achatina ; ventricose, smooth ; apex regular, obtuse, 

 operculum ? The fossil species occurs with marine shells, and 

 sometimes coated by a polyzoon [lepralia). 



Teeebra, Lamarck. Auger-shell. 



Synonyms, Acus, Humph. Subula, Bl. Dorsanum, Gray. 



Type, T. maculata. PL V., Fig. 13. 



Shell long, pointed, many-whorled ; aperture small ; canal 

 short ; operculum pointed, nucleus apical. 



Animal blind, or with eyes near the summit of minute 

 tentacles. 



Distribution, 109 species, mostly tropical. Mediterranean 

 (1 species). India, China, Western America. 



Foesil, 24 species. Eocene — . Britain, France, Chili. 



