330 VERMETID &. 
coast, off Budleigh Salterton, six miles from the shore, in ten 
fathoms water. 
To describe the organs of this animal would be a repe- 
tition of what has been said on Cecum trachea; I will only 
recapitulate them and notice the modifications thereof. 
The brown ovarium, hight green liver, and the rectum with 
its contents of pale brown pellets, extendimg from the py- 
lorus to the doubling amongst the folds of the liver, were 
distinctly visible through the transparency of the shell. The 
stomach, body and neck were of the purest white; the lmes 
forming the canal or groove in the neck are less developed 
than in the former species; the buccal mass is of the palest 
blush colour, and the corneous plates of the most delicate 
and lightest green. The spiny tongue was not seen; the same 
default occurred in Cecum trachea, probably from its white 
colour and extreme slenderness; it doubtless exists. The 
mantle is thick, circular and muscular, closely fittmg the 
shell; the eyes are fixed precisely as nm C. trachea; the very 
minute branchial leaflet is of the palest rose-colour, but the 
mantle must be removed to see it, owing to its extreme tenuity. 
I now come to those organs in which there are some 
variations. The tentacula, as im its congener, are frosted-white 
and setose, but they appear to be proportionably longer, 
slenderer, and more clavate at the tips; these variations how- 
ever are scarcely appreciable. The foot is very short, trun- 
cate in front, rounded behind, and carried much more laterally 
in this species than in C. trachea; and on its posterior upper 
part is the most differential pomt in the animals, the curious 
operculum, which is circular, and has six or seven spiral 
turns, of a pale yellow; but imstead of bemg concave or flat 
without, as in C. trachea, it is the reverse. Supposing the 
flat, spiral, circular operculum of the last species, pushed 
out from its mner surface, or inverted, and thus forming 
a cone of six or seven minute narrow terraces, one above 
the other, we then obtain some idea of the form of that in 
Cecum glabrum. 
This creature marches, and in its course performs exactly 
the same manceuvres, as the larger species. I thought the 
