MANUAL OF NATURAL HISTORY. 127 



siphon short, recurved ; foot simple in front ; 

 shell without varices on whorls ; aperture 

 with no canal but an oblique notch at the 

 fore part. 



4. Family. — Olives (Strephonidse). Mantle enclosed ; 



siphon recurved ; foot fissured on each side in 

 front, the margins reflexed on shell; shell 

 with last whorl enrolled round the others, 

 polished ; aperture with an oblique notch in 

 front. (Olividce, Auct.) 



5. Family. — Tulip-Shells (Fasciolariidse). Mantle 



enclosed ; siphon straight ; lateral teeth not 

 versatile as in Muriciclce, but broad and mul- 

 tidentate ; shell without varices on whorls ; 

 siphonal canal straight ; columella with plaits 

 on fore part. 



6. Family. — False-Volutes (Vasidse). Mantle en- 



closed ; siphon straight ; lateral teeth nar- 

 row, with a single large denticle ; shell with 

 the aperture channelled in front ; pillar with 

 plaits on the middle. (Turbinellidce, Gray.) 



7. Family. Volutes-proper (Volutidse). Siphon short, 



recurved, with auricles on each side at base ; 

 tentacles far apart, united by a veil over the 

 head ; shell with apex of spire mammillated ; 

 columella with plaits. 



8. Family — Mitres (Mitridse). Siphon simple at 



base ; tentacles close together at base ; mantle 

 enclosed ; foot small ; shell with apex of spire 

 acute ; columella with plaits. 



9. Family. — China-Shells (Porcellanidse). Siphon 



