Beé MANUAL OF THE MOLLUSCA. 
readily at the surface, inverted. They feed chiefly on sertularian 
zoophytes, and if kept fasting will devour each other; when 
irritated they discharge a milky fluid from their papille, which 
are yery liable to fall off. 
GLaAucus, Forster. 
Etymology, glaucus, a sea-deity. 
Synonyms, Laniogerus, Bl. Pleuropus, Raf. 
Example, G. Atlanticus, Pl. XIII., Fig. 14. 
Animal elongated, slender ; foot lnear, channeled; tentacles 
4, conical; jaws horny; teeth in single series, arched and 
pectinated ; gills slender, cylindrical, supported on 3 pairs of 
lateral lobes; stomach giving off large cceca to the tail and 
side lobes; liver contained in the papillze; sexual orifice 
beneath first dextral papilla, vent behind second papilla; 
spawn in a close spiral ceil. 
Distribution, 7 species. Atlantic, Pacific. Found on floating 
sea-weed; deyours small sea-jellies, Porpite and Velelle. 
(Bennet.) 
Fiona, Alder and Hancock. 
Type, F. nobilis, A. and H. 
Synonym, Oithona, A. and H. (not Baird), 
Animal elongated; oral and dorsal tentacles linear; mouth 
armed with horny jaws; gills (?) papillary, clothing irregularly 
a sub-pallial expansion on the sides of the back, each with a 
membranous fringe running down its inner side. 
Distribution, 3 species. Falmouth. Under stones at low 
water. (Dr. Cocks.) 
EMBLETONIA, A. and H. 
Etymology, dedicated to Dr. Embleton, of Newcastle. 
Synonyms, Pterochilus, A. and H. f Cleelia (formosa), Loyén. 
Type, H. pulchra, Pl. XIII, Fig. 15. 
Animal slender ; tentacles 2, simple; head produced into a 
flat lobe on each side; papille simple, sub-cylindrical, in a 
single row down each side of the back. 
Distribution, 4 species. Scotland (2 species). In the littoral 
and laminarian zones. 
Calliopea, (bellula), D’Orbigny. Brest; has 2 rows of papille 
down each side of the back; cephalic lobes subulate; yent 
dextral. Lon. 3 lines. 
