PEDIPES. 299 
by the mixed hermaphroditism of the Helices. We refer to the 
Pedipes bidentatus for the other organs; they are so similar 
as to dispense with a repetition, This is the typical and only 
species of the genus. 
PEDIPES, Adanson. 
P. srpentatus, Montagu et nobis. 
Conovulus bidentatus, Brit. Moll. iv. p. 191, pl. 125. f. 1, 2. 
albus et erosus, nonnull. 
Auricula bidentata, ibid. 
Animal spiral, with a white, glossy, short, fusiform shell of 
four volutions, and an elongated narrow aperture. The 
colour throughout the external organs is hyaline flake-white, 
except that occasionally the termination of the muzzle and 
lobes of the head-veil are margined with a fine red-brown line. 
The mantle is fleshy, and sometimes extends rather beyond 
the aperture of the shell; when it is viewed in the dead 
animal, it has the aspect of the rounded tumid margin of the 
Helices. 'The neck is proportionately longer than any other 
animal of its size 1 am acquainted with, and at its termination 
forms a veil divided by a sinuation im its centre into two 
arcuated lobes, from the right and left angles of which two 
very short, flat, setose tentacula spring; these vary, being in 
some animals more cylindrical: a little behind their origin the 
large subrotund eyes are seen, somewhat within the internal 
bases; these appear dull, being imbedded in the skin. Beneath 
the neck-veil a narrow, flat, rather taper, grooved muzzle 
issues, within which the buccal mass, with high powers, may 
be seen in action, though neither the tongue nor the corneous 
plates could be detected. The muzzle rests on the foot, which 
always outruns it a little; it is therefore between the neck- 
veil and the foot that this organ anteally forms two curved 
lobes, caused by the deep indentation in its centre. The pedal 
disk is moderately long and rather broad, divided transversely 
very deeply at a third of its length ; the other two-thirds taper 
gradually to a moderately rounded termination, sometimes 
slightly emarginate and with a medial groove; the pedicle of 
