CHEMNITZIA. 423 
with interstitial short transverse lines; the general aspect as 
to colour is pale azure-hyaline, irregularly aspersed with 
snow-coloured opake flakes. The rostrum proceeds from the 
coalescmg tentacular membrane, forming a sort of head-veil 
to a little beyond the foot; it is long, flat, and terminates in 
two arcuated lobes with a wide central indentation between 
them ; the proboscidal orifice is not quite at the extremity of 
the rostrum, but is placed on its upper surface. The tenta- 
cular veil, originating in the basal coalition of those organs, 
is entire, and diverges into two very short, flat, broad, bevelled, 
subtriangular tentaculiform processes rounded on the tips, on 
each of which there are about nine intense-white subcircular 
minute flakes. The eyes are not on the triangular bases of 
the tentacula, but a little posterior to their origin, imbedded 
in the skin of the anterior base of the neck exactly behind 
them ; that is, it can scarcely be appreciated if the inclination 
be external or internal. The foot is large, moderately long, 
auricled in front, bevelled to a very fine edge, and when in 
the full extension of march tapers to a point, when at rest it 
is rounded ; it is flat, of thin texture, of a pale blue-hyaline 
colour, suffused with opake snow-white matter; it carries on 
a simple, scarcely raised operculigerous lobe, situate quite at 
the middle, or at the junction of the pedicle of the foot with 
the body, an oblong-oval light corneous operculum, with a 
depressed point as a nucleus, from which oblique strize of 
increment proceed. The branchiz, buccal apparatus, and 
the organs of reproduction were not seen, as the shells 
could not be destroyed, and it is probable that their minute- 
ness would have caused any attempt to detect them to end 
in failure. 
There is no tooth on the columella of this species, as in 
most of the preceding ones, but there are sometimes within 
the aperture of the ultimate volution one or two minute 
denticles, as im Conovulus denticulatus, and we have the 
C. acicula with a decided pillar fold. These columellar ap- 
pendages cannot at all be depended on from their instability 
and variableness ; they may serve as a kind of mark to distin- 
guish one species from another conchologically, but even that 
