298 CONOYULID^E. 



cula are short, contiguous, thick, almost conical below, a little 

 flattened above, and blunt ; the eyes are dull, large, and im- 

 mersed at the internal bases ; the neck, muzzle and tentacula 

 are more or less brindled with lines, points, and transverse 

 blotches of dark lead-colour. The foot is elongated, thick, 

 rather narrow, rounded at the posteal extremity, and also 

 nearly as much anteally, having very obsolete auricles; the 

 sole is perfectly plain, without even a longitudinal line in the 

 centre, and not a trace of the conspicuous transversely-grooved 

 foot of the next genus and species, the Pedipes bidentatus ; it 

 is marked with dark-coloured lines above, and is yellowish- 

 white beneath; the pedicle of attachment is very long, ex- 

 tending nearly throughout the range of the neck to the head. 



That this animal breathes free air is placed beyond doubt. 

 I distinctly, repeatedly, and without difficulty observed the 

 dilatation and closure of the respiratory perforation at the 

 upper angle of the outer lip, precisely as in Helix, and within 

 the aperture the rectum is visible, from which the issue of 

 faeces was seen, as also the network of a part of the branchial 

 vault ; thus confirming my observations and conjectures on the 

 closely allied genus and species, Pedipes bidentatus, described 

 below, and recorded in the Annals of Natural History, vol. vi. 

 p. 446, N.S. This result was obtained by having consigned 

 to me, by Miss Cutler, a distinguished naturalist at Budleigh 

 Salterton, some fine C. denticulatus, full J of an inch long, 

 being three times the size of the Pedipes bidentatus, from 

 which I drew my first conclusions. These specimens were 

 taken in company with the Rissoa ulvas, but were very rare, 

 from Bostrychia growing in a salt marsh near that place. The 

 animal was the ventricose variety. 



This species differs greatly in contour, usually becoming 

 ventricosely fusiform as it diminishes in length. The ex- 

 amples observed had three columellar plications, the upper 

 one the smallest, and a longitudinal callus within the outer 

 lip, and one or two rudimental denticles. The locomotion 

 is not so active as in Pedipes. The general aspect of the 

 animal is decidedly dark, whilst that of Pedipes is nearly 

 hyaline white. Its reproduction is in all probability effected 



