37 
a single acute apex and divergent base, very small at the tip of the 
proboscis. Volutomitra, 
e. Porcellanina. Siphon simple at the base; tentacles close to- 
gether at the base; mantle lobes expanded, covering the shell ; oper- 
culum none; teeth in a single series, broad, transverse, band-like, 
toothed in front, like Quoy’s figure of Mitra. Porcellana, Persicula, 
’Hyalina. 
A specimen of P. glaéella in spirits showed no appearance of the 
dilatation of the mantle. 
D. Toxoglossa. Teeth sunk into the proboscis in two lateral series 
(1-0-1), elongate, subulate (fig. 9). 
Fam. 9. PLevrotomip#. Siphon of mantle and canal of shell 
straight ; mantle and shell often with a slit in hinder part of right 
side. 
Fig. 9.—Mangelia. 
a. Pleurotomina. Operculum ovate, acute; nucleus apical. Pleu- 
rotoma, Drillia. 
b. Clavatulina. Operculum semiovate ; nucleus in the centre of 
the straight front edge. Clavatula, Tomella. 
ce. Defrancianina. Operculum none. Mangelia, Defrancia. 
E. Teenioglossa. Teeth on lingual membrane in seven rows (3°1°3), 
central generally toothed, lateral in three series, converging, the inner 
often broad, two outer subulate, versatile (figs. 10, 11). 
Fam. 10. Doxirp%. Head truncated ; tentacles moderate ; pro- 
boscis-sheath large, funnel-shaped, free on the edge; foot small; siphon 
of mantle recurved; mantle enclosed; operculum none. Tongue ——? 
Dolium, ’Malea. 
Fam. 11. Trirronirap#. Head truncated; tentacles moderate ; 
proboscis-sheath small ; foot small ; siphon of mantle and canal of shell 
straight ; shell variced ; mantle enclosed ; operculum ovate, annular; 
nucleus lateral or apical. 
a. Ranellina. Operculum half ovate; nucleus central, lateral or 
internal; varices acute. Ranella. 
b. Tritonina. Operculum ovate ; nucleus apical ; varices rounded. 
Apollon, Triton. 
c. Personina. Operculum small, triangular, broad ; nucleus apical ; 
varices acute, foliaceous. Persona. 
