BULLA. 277 
or tubular, but have the aspect of loose muscular straps ; they 
however spring from two small yellow spongy or granular 
bodies, situate on the upper part of the gizzard; these I pre- 
sume are the salivary glands; if so, the straps are the excre- 
tory ducts. They lie on each side the cesophagus in the most 
lax manner: I should have called them cesophageal, gizzard 
and buccal mass retractors, as they are connected with all 
these organs, if M. Cuvier had not determined them to be 
salivary glands; but he is in error in stating, “ L’hydatis les 
a tres longues, inégales, et celle du cdté gauche fourchue par 
son extrémité postérieure.” We have in our cabinet perfect 
preparations of these organs, and can positively state that they 
are of the same length, entirely symmetrical, with both ends 
fixed to the gizzard and posterior part of the buccal mass ; 
they do not float loose, of different lengths and forms, as 
represented in pl. 2. fig. 14. of M. Cuvier’s memoir. Having 
dissected numerous specimens we are quite sure on this point. 
Though we admit the straps to be the salivary glands, sub fide 
Cuvieri, still we are much astonished that that great naturalist 
has not noticed the very visible dendroid leaflets on each side 
the mouth; we must consider them an additional pair of sali- 
vary glands: some mollusca have an upper and lower pair, 
and these would appear to be more adapted for such purpose 
than the slender strap-shaped filaments. I can only account 
for their not bemg noticed, on the supposition that the glan- 
dular leaves in M. Cuvier’s specimens must have been so 
discoloured by the spirit as to have escaped attention. One 
word more on them: as they are situated exactly at that part 
of the groove which corresponds with the position of the 
cesophageal ganglions, it is possible that, as these nervous 
masses are of larger volume than I ever saw in any other gaste- 
ropod, the glandular leaflets may excrete a liquor to invigorate 
and minister to the nervous influences: this is a mere conjec- 
ture: I certainly inchne to regard them as salivary glands. 
Mr. A. Hancock thinks that the leaflets I have mentioned are 
olfactory organs: I altogether dissent from this opinion. 
Having mentioned the nervous system, it may be as well at — 
once to notice it, as M. Cuvier scarcely alludes to it. From 
