39 
of the straight inner side. Bezoardica, !Cassis, 'Levenia, ?Morio. 
The teeth bear no resemblance to those figured by Quoy and Gaimard 
as those of Bezoardica. 
Fam. 16. ScaLaRtaAD&. Foot moderate; mantle enclosed; shell 
turrited, variced, without any canal; eyes on outer side of the subu- 
late tentacles ; operculum horny, spiral (fig. 12). Sealaria. 
TOCA 
Fig. 12.—Scalaria Turtoni. 
Fam. 17. Acrzonip&. Foot moderate; mantle enclosed; eyes 
on the inner side of the base of the expanded tentacles ; operculum 
horny, subspiral. Acton. 
G. Gymnoglossa. Teeth and lingual membrane rudimentary or 
none. 
Fam. 18. Acusip#. Foot small; mantle enclosed, with an elon- 
gated siphon; shell turrited, lip thin, not variced; eyes on tip of 
tentacles or wanting; tentacles very small or wanting; operculum 
annular, nucleus apical. Acus (tentacles small). Subwla (tentacles 
and eyes none). Leiodomus (suture callous ; operculum ovate ; ten- 
tacles small; has been confounded with Bullia). ?Dorsanum. 
Fam. 19. PyramipELLID&. Foot moderate; mantle enclosed ; 
eyes on the inner side of the broad folded tentacles; operculum 
horny, spiral; shell spiral, pillar plaited. 
a. Pyramidellina. Shell turrited. Odeliscus, Odostomia, Eulima, 
Aclis, ?Stylina, Alvania. 
b. Tylodinina. Shell subspiral. Tylodina. 
Cerithiopsis of Forbes and Hanley, tab. OO, if accurately described, 
must form a new family in this section. 
Fam. 20. ArcuiTEctomip#. Tentacles folded, with the suture 
below ; eyes sessile on upper surface of their base (Hydoux). Gill- 
cavities divided by a longitudinal fold; foot moderate, truncated and 
double-edged in front, rounded behind (Quoy) ; proboscis very long, 
completely retractile ; teeth none. 
a. Operculum ovate. Architectoma. 
6. Operculum circular. Torinia, Bifrontia. 
Suborder II. Rostrirera. 
A. Gymnoglossa. Lingual membrane and teeth none; operculum 
none. 
Fam. 21. CanceLutariap&. Mantle enclosed; pillar of shell 
folded ; operculum none. Admete, ?Cancellaria. 
