CONOVULUS. 193 



The animal is of a creamy white. Its tentacles are 

 short, blunt, and subtriangular, diverging but approxi- 

 mated at their bases. The eyes are placed rather far 

 back. The sole of the foot is sulcated across the centre, 

 so as to form two creeping disks. 



" 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 mar- 

 gin of the Helices. The neck is proportionately longer 

 than in 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 cylin- 

 drical ; a little behind their origin the large subrotund 

 eyes are seen at rather the internal bases : these appear 

 dull, being imbedded within the skin. Beneath the neck- 

 veil a narrow, flat, rather taper, grooved muzzle issues. 

 The muzzle rests on the foot, which always outruns it a 

 little. 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 mode- 

 rately rounded termination, sometimes slightly emarginate, 

 and with a medial groove. The structure of the foot is 

 that of Pedipes ; its quality of locomotion perfectly agrees 

 with the etymology of the term : it is very slow, in conse- 

 quence of a double action of the pedal disk being necessary 

 to effect progression, the anteal portion being first carried 

 forward, accompanied by the head and neck, and is then 

 fixed, when the posterior portion carrying the shell is drawn 

 up to its predecessor or pes pedi, and so on, and thus a 

 slow march is accomplished. 1 ' — Clark. 



This pretty shell is most frequently found on our 



vol. iv. c c 



