FOSSAR. 319 



Sub-gen. epheria, Leach. 



Shell thin, usually with coloured bands ; spire rather elevated ; 

 inuer lip thin, acute ; umbilical fissure linear. 



albella, Loven. fasciata, Adams. 



canalis, Mont. fragilis, Mke. 



carinata, Gould. frigida, Loven. 



carinifera, A. Adams. glaciaHs, Mull. 



divaricata, 0. Fabr. quadrifasciata, Mont. 



Sub-gen. medorta, Leach. 



Shell conical, solid ; spire elevated ; periti'eme dilated and 

 refle.xed anteriorly ; inner lip thick, flattened ; umbilical fissure 

 obsolete. 



crassior, Walker. solidula, Loven. 



labiosa, Loven. 



Genus FOSSAR, Adanson. 



Tentacles furnished, internally, with a frontal lobe. 



Operculum ovate, subspiral. 



Shell semiglobose, whorls ribbed or cancellated, axis 

 perforate ; aperture semi-rotundate, entire ; inner lip 

 straight, edentulate, never callous ; outer lip acute, smooth 

 internally. 



Syn. Fossarus, Phil. Maravignia, Aradas and Mag. 

 Naticella, Munster. Phasianema, 8. Wood. 



Ex. F. ambiguus, LiniKsus, pi. 33, fig. 7. Operculum, 

 F. variegatus, A. Adams, fig. 7, a, 7, h. Shell, F. costatus, 

 Brocchi, fig. 7, c. 



The great peculiarity of this genus is the fact of the 

 animal having two frontal lobes between the tentacles. 



