OLIVID^E, OLlVINvE. 51) 



Family OLIVID^E. 



Animal with a recurved siphon, and voluminous foot, its lobes 

 usually reflexed over the sides of the shell, and fissured on each 

 side in front. Dentition 1-1-1, the rhachidian teeth broad, the 

 laterals versatile. Operculum corneous, small, present or wanting. 



Shell brilliantly colored, porcellanous, without epidermis, the 

 columellar lip, sutures and spire more or less covered with a 

 callous deposit ; outer lip simple, aperture obliquely notched 

 below. 



Subfamily Olivinse. Head and tentacles more or less con- 

 cealed ; mantle with a tapering lobe in front, and an appendage 

 behind which reposes in the channeled suture. 



The operculum is present in Olivr.lla, absent in Oliva. 



Shell solid, smooth, subcylindrical ; sutures channeled; inner 

 lip more or less plicate anteriorly. Several figures of the*animals 

 of Oliva are given on PL 1 ; also the animal without its shell, 

 PI. 3, fig. 31 ; anatomy, PL 3, fig. 21. For explanation of the 

 latter see Reference to Plates. 



Subfamily Anvillariinse. Head concealed; eyes none; tenta- 

 cles rudimentary ; mantle with a tapering lobe in front ; foot 

 voluminous, bifid behind, shield-grooved on the upper surface, 

 side-lobes not much produced. 



Operculum small, ovate, acute, sometimes entirely wanting. 



Shell usually polished ; sutures covered by callus ; whorls 

 smooth ; aperture effuse, the columella variously grooved and 

 twisted in front. 



Subfamily Harpinse. Head and tentacles exposed ; eyes con- 

 spicuous ; mantle simple, enclosed, without a tapering appendage 

 in front ; foot large, flat, not reflexed on the sides of the shell. 



No operculum. 



Shell large, ventricose, longitudinally ribbed ; columellar lip 

 without anterior plications or grooves. 



Subfamily OLIVINSE. 



Synopsis of Genera. 



OLIVELLA, Swainson. 



Animal without tentacles or eyes ; mantle with a large frontal lobe ; 

 foot not very voluminous, truncate behind, the shield narrow, the side- 

 lobes small and acute. Operculum horny, thin, half ovate, with apical 



