GASTEROPODA. HI 



Suh-genus. Cominella, Gray. Ex. B. limhosim, purpura maculosa, &c. 

 Operculum as mfusus. About 12 sp. 



PsEUDOLiVA, Swainson. 



Etpn., named fi*om its resemblance to oliva, in form. 



Syn., sulco-buccinum, D'Orb. Gastridium (Gray), G. Sowerby. 



Ti/pe, P. pkunbea. PI. V., fig. 12. 



Shell globular, thick ; with a deep spiral fmTow near the front of the 

 body-whirl, forming, as in monoceros, a small tooth on the outer lip ; spire 

 short, acute ; sutm-e channelled ; inner lip callous apertm'e notched in front ; 

 operculum ? Animal unknown. 



Bistr., 6 sp. ? "VV. America. 



Fossil, 5 sp. Eocene. Brit., France, Chile. 



? Anolax (Roissy), Conrad. Lea. 



Etym., an aidax, without furrow. 



Syn., buccinanops, D'Orb. Leiodomus, Sw. BuUia, Gray. 



Types, A. gigantea. Lea. Buc. lavigatum. B. semiplicata, PI. V., fig. 14. 



Sliell variable ; like buccinum, pseudoliva, or terebra : sutm-es enamelled ; 

 inner lip callous. 



Animal without eyes ; foot very broad ; tentacles long and slender ; 

 operculum pointed, nucleus apical. 



Bistr., 26 sp. Brazil, W. Africa, Ceylon, Pacific, W. America. 



Fossil, 3 sp. Eocene — . N. Ameiica, France. 



? Halia, Risso. 



Mym,, halios, marine. Syti., priamus, Beck. 



Types, bulla helicoides (Brocchi). Miocene, Italy. Helix piiamus (Meus- 

 chen). Coast of Guinea ? 



Shell like achatlna ; ventricose, smooth ; apex regular, obtuse ; operc. ? 

 The fossil species occurs with marine shells, and sometimes coated by a coral 

 {lepralia). 



Terebra, Lamarck. Auger-shell. 

 Syn., acus, Humph. Subula, Bl. Dorsanum, Gray. 

 Type, T. maculata. PI. V., fig. 13. 



Shell long, pointed, many-whirled ; aperture small ; canal short ; operc. 

 pointed, nucleus apical. 



Animal blind, or with eyes near the summit of minute tentacles. 



Bistr., 109 sp., mostly tropical. Medit. (1 sp.) India, China, W. America. 



Fossil, 24 sp. Eocene — . Brit. , France, Chile. 



Eburna, Lamarck. Ivory-sheU. 

 Etym., ehir, ivory. Syn., latrunculus. Gray. 



