338 MANUAL OF THE MOLLUSCA. 



veil and two labial tentacles ; papillae ovate, placed along the 

 lateral ridges of the back and continuous above the head ; vent 

 central, posterior, sexual orifice at the right side ; lingual teeth 

 numerous. ? 



DistrilnUon, 3 species. Britain, Mediterranean. 



Hermjea, Loven. 



Type, H. bifida, PI. XIII., Fig. 17. Norway, Britain. 



Animal elongated, tentacles folded longitudinally; papDlae 

 nninierous, arranged down the sides of the back ; sexual orifice 

 below right tentacles ; vent dorsal, or sub-lateral, anterior. 



Aldeeia, AUman. 



Etymology, named after Joshua Alder, one of the authors of 

 the " Monograph on the British Nudibranchiate MoUusca." 



Type, A. modesta, PL XIII. , Fig. 18. 3 species. Norway, 

 South Ireland, and South Wales. 



Animal oblong, without tentacles ; head lobed at the sides ; 

 papillse arranged down the sides of the back ; vent dorsal, 

 posterior. 



? Stiliger (ornatus), Ehrenberg ; Eed Sea. "Vent dorsal, 

 anterior. 



Chioe^ra, Gould, 1855. 



Animal oblong ; head large, pedunculated and provided with 

 oral cirri ; papillae foliaceous and arranged in two lateral rows ; 

 generative organs on the right side. C. leonina, Puget Sound. 



Family IX. — Phyllirhoidje. 

 Animal pelagic, foot-less {apodal), compressed, swimming 

 freely with a fin-like tail ; tentacles 2, dorsal ; lingual teeth in 

 a single series ; stomach furnished with elongated oceca ; orifices 

 on the right side ; sexes united. 



Piiyllirhoe, Peron and Lesueur. 



Etymology, phyllon, a leaf, rhoe, the wave. 



Synonym, Eurydice, Esch. 



Type, P. bucephala, Peron. 



Distribution, 6 species. Mediterranean, Moluccas, Pacific. 



Animal translucent, fusiform, with a lobed tail ; muzzle 

 round, truncated ; jaws horny; lingual teeth 3.0.3; tentacles 

 long and slender, with short sheaths ; intromittent organ long, 

 bifid. 



