PEDIPES. 299 



by the mixed hermapliroditism 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. BIDENTATUS, Montagu et nobis. 



Conovulus bidentatus, Brit. Moll. iv. p. 191, pi. 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 I am acquainted with, and at its termination 

 forms a veil divided by a sinuation in 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 IDC 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 



