332 MANUAS. OF THE MOLLUSCA. 
Crimora, A. and H. ~ 
Body limaciform. Cloak nearly obsolete, forming a veil with 
branched appendages oyer the head, and a papillated ridge on 
the sides of the back. Dorsal tentacles laminated, retractile 
within sheaths; oral tentacles tubercular. Branchize plumose, 
non-retractile. Lingual teeth 26.0.26. . 
PELAGELLA, Grube. 
Animal oblong; tentacles sheathless; head-veil without pro- 
cesses; ridge along the middle of the back, and two lateral ones; 
8 feathery gills arranged in a circle. 
Distribution, 1 species. South Europe. 
GYMNODORIS, Steenstrup. 
Animal oblong; tentacles sheathless; gills, with lateral pro- 
cesses, dendritic, 2 or more in number. 
Distribution, 1 species. Japan. 
ACANTHODORIS, Grube. 
Animal oblong; tentacles sheathless; retractile within a 
cavity in the mantle; several fleshy processes on the back; 8 
feathery non-retractile gills. 
Distribution, 2 species. North Sea. 
CASELLA, H. and A. Adams. 
Tentacles retractile within sheaths; gills laminated, with 6 
lobes. 
Distribution, 1 species. East India. 
BRACHYCHLAMIS, Ehrenberg. 
Mantle long, angular ; tentacles in front of the edge of mautle. 
Distribution, 1 species. Hast Africa. 
FamIty VII.—TRITONIADZ. 
Animal with laminated, plumose, or papillose gills, arranged 
along the sides of the back; tentacles retractile into sheaths ; 
lingual membrane with 1 central and numerous lateral teeth ; 
orifices on the right side. 
TRITONIA, Cuvier. 
Laample, T. plebeia, Pl. XIII., Fig. 7. 
Animal elongated; tentacles with branched filaments; veil 
tuberculated or digitated; gills in single serins on a ridge down 
