336 MANUAL OF THE MOLLUSCA. 



readily at tlie surface, inverted. They feed cliiefly on sertularian 

 zoopliytes, and if kept fasting will devour each other; when 

 irritated they discharge a milky fluid from their papillae, which 

 are very liable to fall off. 



Glatjcus, Forster. 



Etymology y glaucus, a sea-deity. 



Synonyms, Laniogerus, Bl. Pleuropus, Eaf. 



Example, Gr. Atlanticus, PI. XIII., Pig. 14. 



Animal elongated, slender ; foot linear, channeled ; tentacles 

 4, conical ; jaws horny ; teeth in single series, arched and 

 pectinated ; giUs slender, cylindrical, supported on 3 pairs of 

 lateral lobes; stomach gi\'ing off large cceca to the tail and 

 side lobes ; liver contained in the papillse ; sexual orifice 

 beneath first dextral papilla, vent behind second papiUa; 

 spawn in a close spiral coil. 



Distribution, 1 species. Atlantic, Pacific. Found on floating 

 sea-weed; devours small sea-jellies, PorpitcG and Velellos, 

 (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-palHal expansion on the sides of the back, each with a 

 membranous fringe running down its inner side. 



Distrihution, 3 species. Falmouth. Under stones at low 

 water. (Dr. Cocks.) 



EaiBLETONiA, A. and H. 



Etymology, dedicated to Dr. Embleton, of Newcastle. 



Synonyms, Pterochilus, A. and H. ? Cloelia (formosa), Loven, 



Type, E. pulchi'a, PI. XIIL, Fig. 15. 



Animal slender; tentacles 2, simple; head produced into a 

 flat lobe on each side; papillse simple, sub-cylindrical, in a 

 single row down each side of the back. 



Distrihution, 4 species. Scotland (2 species). In the littoral 

 and laminarian zones. 



Calliopcea, (bellula), D'Orbigny. Brest; has 2 rows of papillae 

 down each side of the back; cephalic lobes subulate; vent 

 dextral. Lon. 3 lines. 



