300 IIELICINIDiE. 



Sub-gen. omphalotkopis, Pfeiffer. 



Shell perforated or umbilicated, with a keel round the umbi- 

 licus ; peristome straight or expanded. 



aurantiaca, Desk. multilirata, Pfeiff. 



dubia, Pfeiff. plicosa, Pfeiff. 



erosa, Quoy. pupoides, Anton. 



expansilabris, Pfeiff. pyramis, Pfeiff. 



exquisita, Pfeiff. radiate, Pfeiff. 



globosa, Bens. rosea, Gould. 



hieroglyphica, Ferns. rubens, Quoy. 



Huaheinensis, Pfeiff. scitula, Gould. 



glabrata, Pfeiff. solidula, Pfeiff. 



granum, Pfeiff. terebralis, Gould. 



malleata, Pfeiff. vallate, Gould. 



Genus BOURCIERA, Pfeiffer. 



Operculum oval, rather solid, horny, whorls few, rapidly 

 enlarging. 



Shell heliciniforrn ; columella dentated at the base ; aper- 

 ture oval; peristome expanded. 



Ex. B. helicinseforrnis, Pfeiffer, pi. 87, fig. 3. Oper- 

 culum, B. helicimcforrnis, fig. 3, a, 3, b. 



There is but one species known, discovered by M. 

 Bourcier at Yaraqui, in the Republic of the Equator. 



Fam. HELICINIDjE. 



Lingual teeth with a single, central, flanked on each side 

 by three laterals. Head proboscidiform ; tentacles subulate, 

 with the eyes at their outer bases. Foot elongated. 



