828 VERMETID 4. 
of which are of light yellow and subelliptical form. The tongue 
was not detected, though, without doubt, one, of the invariable 
spiny character, exists. 
The tentacula are short, rather thick, subeylindrical, setose, 
and slightly clavate at the extremities; the eyes are very 
minute, black, not raised on any kind of pedicle or emimence, 
and placed nearly in a line with the tentacula at a short 
distance from their bases, and if there is a divergence there- 
from, the tendency is external. 
The slender neck, as in most of the other Gasteropoda, is 
furnished with longitudinal ridges ; and in this species, on each _ 
side of its centre, there are two frosted, pale yellowish-white, 
contiguous raised lines, forming a very decided canal or groove, 
the pomts of which terminate anteriorly at the immediate 
base of the eyes, and posteriorly at the furthest end of the 
neck, on the left side of which, at the usual poimt, may be 
seen a minute pale red branchial leaflet, which puts on the 
appearance of there being two, a larger and a smaller one, as 
in the canaliferous Gasteropoda. But here, though we cannot 
vouch that there are not two, we are inclined to think there 
is only one, with a divergence from its base of a part of its 
surface ; the very marked canal seems necessary for the en- 
trance of the branchial water, in consequence of the neck of 
the animal, when at rest, beimg so closely embraced by the 
fleshy muscular circular mantle, but in marching order it is 
protruded to an extraordinary extent. 
The stomach was distinctly observed, and is an oblong 
bursiform organ, yellowish-white and granular without, but 
on being opened presents a dark lead-coloured cavity, fortified 
by strong transverse muscular bands or fillets. From it arises a 
very long convoluted intestine, which when extracted exhibited 
the usual feecal matters ; it appeared to coast the liver and ova- 
rium, amongst the folds of which it makes a double, as is usual 
with the regular Gasteropods, and then progresses to the right 
side, where the minute, elongated, oval, conically-poimted 
pellets were observed to be ejected. 
The ovarium is dark red-brown, aspersed with very mi- 
nute darker pomts, like the finest sand, with its posterior 
