35 
Fam. 3. Cassrputip#. Head produced, conical ; tentacles very 
small, at the end of the head; lateral teeth flat, bent up at the end; 
siphon of mantle and canal of shell straight, bent up at the end; 
mantle enclosed ; foot simple (fig. 2). 
yey 
Fig. 2.—Cassidulus morio. 
a. Operculum annular. Cassidulus, Fulgur. 
6. Operculum none. Cochlidium. 
Fam. 4. Oxtvip#. Siphon of mantle recurved ; foot with a cross 
groove on each side in front, often enclosing part of the shell ; mantle 
enclosed ; operculum small or none (fig. 3). 
Va) 
Fig. 3.—Ancillaria candida. 
a. Olivina. Pillar of shell plaited in front. 
4 Lateral teeth broad ovate. Strephona, Olivella, Scaphula, Aga- 
ronia. 
** Lateral teeth hook-like, narrow. Ancillaria, Eburna. 
?b. Harpina. Pillar of shell smooth. Teeth ——? AHarpa. 
Fam. 5. LameLuariapa&. Lateral teeth simple, curved ; mantle 
very large, covering the shell, with a notch in place of the siphon in 
front ; operculum none (fig. 4). Lamellaria, Coriocella. The genus 
Marsenina ( prodita) appears more allied to Velutinide. 
Fig. 4.—Coriocella perspicua. 
B. Odontoglossa. Teeth on lingual membrane in three series 
(1:1°1), the central recurved, toothed at the tip, the lateral not 
versatile (figs. 5, 6). 
Fam. 6. FascrotaAriaAD&. Head truncated ; tentacles moderate ; 
mantle enclosed ; siphon and canal of shell straight ; shell with plaits 
