(98 ) 
Mouth a small trunk 
ORDER J. NUDIBRANCHI. 
GENERA. 
1. Donts. (1) Cuv. 
Branchiz posterior, 2 Small conical ten- 
ranged in aciele. tacula to the mouth, 
2. Potycena. Cuyv. 
Branchiz as in Doris, 
but more simple and with 
two membranous plates 
covering them in the mo- 
ment of danger. 
3. Tritonta. (2) Cuv. 
Branchie ranged along 
the two sides of the back. 
4. Tuernys. Lin. 
Two rows of branchiz 
the whole length of the 
back, like bunches of fea- 
thers; a large, membra- 
nous, fringed veil on the 
head. 
5. Scyuima. (3) Lin. 
Body compressed ; foot 
narrow, with a furrow 
for seizing the stems of 
fuci : two pair of mem- 
branous crests on ‘the 
back. Pl. 15, fig. 7, 8, 9. 
6. Guaucus. (4) 
Body long, slim; three 
or four branchize on each 
side, formed of long 
thongs, disposed like fans 
and serving as fins. 
1) A peculiar liquor issues from a gland interlaced with the liver. 
P q § 
and 2 club-shaped from 
the upper part of the 
mantle. 
2 Club-shaped tenta- 
cula before; 4 or 6 
others simply pointed. 
Ditto. 
2 Compressed _tenta- 
on the fore part of the 
mantle. 
* 
Mouth with 
membranous lips. 
large 
Mouth a membranous 
cula, with a small coni- trunk without jaws. 
cal point on the edge, 
Ditto. 
4 Very small conical 
tentacula. 
Mouth like a small 
trunk. 
Swim on their back. 
They are 
found in allseas. Their spawn is spread like gelatinous bands onstones, varecs, etc. 
(2) The orifice for the liquor is pierced to the right, and their mouth is armed 
within by two lateral jaws, horny and sharp, and resembling shears. 
(3) The middle of the stomach is furnished with a fleshy ring, armed with sharp 
horny blades like knives. 
(4) They are beautiful little animals inhabiting the Mediterranean and the Ocean, 
agreeably coloured with azure and mother of pearl, and swim on their back with 
great swiftness. 
clearly distinguished. 
They have not yet been dissected, and the species are not very 
