450 PYRAMIDELLIDZ, 
E. pourra, Linneus. 
E. polita, Brit. Moll. iii. p. 229, pl. 92. f.1, 2,3; (animal) pl. K.K. 
f. 2, 3, and iv. p. 273. 
E. nitida and E. distorta, Auct. 
Animal of twelve to sixteen spiral turns, inhabiting a 
white, highly-polished, porcellanous, conically-tapering, subu- 
late shell. Mantle white, fleshy, fully lining the aperture, but 
there is no reflexion or extension of it to account for the 
perfectly glabrous aspect. Head moderately large, flattish, not 
much produced; mouth below vertically cloven. The tenta- 
cula are short, conical, poimted, nearly united at the bases, 
diverging gradually to their terminations; the basal halves 
are pure white, the terminal portions yellow or orange, some- 
times of a greenish-yellow. The eyes are large, and when the 
animal marches, generally lie under the anterior margin of 
the aperture, but from its tenuity and lustre are easily ob- 
served; they are very rarely exserted beyond the limits of the 
shell, and are fixed at the centres of the bases of the tenta- 
cula; they are mounted on minute orange-coloured eminences. 
The foot is small, short, seldom extended beyond the basal 
whorl, truncate and auricled anteriorly, very moderately acu- 
minated behind; the sole in front is separated from the upper 
skin by a groove, forming double labia, and carries on the 
operculigerous lobe a thin, light horn-coloured, flexible, sub- 
oval, obliquely-striated operculum. The anterior upper margin 
of the foot is bordered by two linear segments of a circle, with 
the convexity outwards, but mdented in the middle, of a 
bright orange-yellow ; but these colours, intensely marked, are 
only observable in adult specimens, the younger ones being 
white. I have omitted to mention, that several portions of 
the foot are more or less tinctured with orange-yellow. The 
verge of this species springs under the right tentaculum ; it 
is rather long, pale yellow, flat and strap-shaped for two- 
thirds of its length; at the end it becomes more spread 
and faleate, with two short orange-coloured stripes at the 
terminus, where the orifice is placed. The testis is an elon- 
gated oval, yellowish lobe, situate in the posterior volutions, 
and communicating with the verge by a long, wrinkled, tor- 
