338 MANUAL OP 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. ? 



Distrihution, 3 species. Britain, Mediterranean. 



Heem^a, Loven. 



T7/pe, H. bifida, PL XIII., Fig. 17. Norway, Britain. 



Animal elongated, tentacles folded longitudinally; papillae 

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

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



Alderia, AUman. 



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

 the "Monograph on the British Nudibranchiate Mollusca." 



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

 South Ireland, and South Wales. 



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

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

 posterior. 



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

 anterior. 



Chioejsea, 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. — Phyllirhoid^. 



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 coeca ; orifices k 

 on the right side ; sexes united. I 



Phylliehoe, Peron and Lesueur. 



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



Synonym, Eurydice, Esch. 



Type, P. bucephala, Peron. . 



Distrihution, 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. 



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