4] 
D. Teenioglossa. Lingual membrane with seven series of teeth 
(3°1-°3), the central broad, the lateral converging, the inner often 
broader ; outer lateral conical, except in Viviparidee (figs. 15-26). 
A. Operculum subannular or none; mantle furnished with a si- 
phon, and shell with a canal in front. 
* Eyes sessile, on the outer side of the base of the tentacles. 
Fam. 24. Cyprzapz. Operculum none; mantle lobes expanded, 
covering the shell; outer lateral teeth conical, entire or toothed (fig. 15). 
Cyprea, Trivia, *Cyprovula, Luponia, Naria, Aricia, Erato. 
Fig. 15.—Cyprea helvola. 
Fam. 25. Pepicutariap&. Operculum none; mantle enclosed 
(fig. 16). Pedicularia. 
Fig. 16.—Pedicularia sicula. 
Fam. 26. AporrHAIDz. Operculum annular, ovate, nucleus 
apical, small ; mantle, outer edge expanded, lobed, or rarely reflexed ; 
siphon and canal of shell bent to the right (figs. 17,18). Aporrhais ; 
Trichotropis (lingual membrane short, broad); Separatista, Stru- 
thiolaria. 
(See observations on Trichotropis at p. 38.) 
Fig. 17.—Aporrhais pes-pelicani. Fig. 18.—Trichotropis borealis. 
** Eyes on elongated peduncles. 
Fam. 27. Stromsip#. Foot compressed, used for jumping, not 
walking ; mantle, outer side generally expanded and often lobed ; 
muzzle longly conical. 
a. Strombina. Tentacles on middle of eye-pedicel ; operculum 
claw-like. Strombus, Pterocera, Fusus. 
b. Seraphina. Tentacles none?, operculum horny, claw-like, with 
three claws; teeth ——? Seraphys. 
