7. Eourpia. 
Branchiz like plates or 
leaves, in transversal rows 
on the two sides of the 
back. Pl. 15, fig. 6. 
8. Tercires. Cuv. 
A row of branchiz (1) 
along each side of the 
back. 
ORDER II. 
1. Puynwipra. (2) Cuv. 
Mantle naked, general- 
ly coriaceous. Pl. 15, fig. 
0,44, 12. 
2. Dipnysurmra. 
Mantle more pointed 
behind : head semicircu- 
lar. 
(59 ) 
2 Tentacula. 
GENERA. 
1 Tentaculum on each 
side of the mouth, and 
2 from above the two 
small cavities of the 
mantle. 
1 Pointed tentaculum 
and a slight tubercle on 
each side of the head. 
Walk on their back. 
INFEROBRANCHI. 
Mouth a small trunk. 
(1) These are each terminated by a little sucker, and serve as fect for walking on 
the back. 
(2) Their heart is towards the middle of the back, the stomach is simple and 
membranous, and the intestine short. 
