838 MANUAL OF THE MOLLUSCA. 
veil and two labial tentacles; papillze ovate, placed along the 
lateral ridges of the back and continuous aboye the head; yent 
central, posterior, sexual orifice at the right side; lingual teeth 
numerous. ? 
Distribution, 3 species. Britain, Mediterranean. 
HERMa@A, Loyén. 
Type, H. bifida, Pl. XIII, Fig. 17. Norway, Britain. 
Animal elongated, tentacles folded longitudinally; papille 
_ mumerous, arranged down the sides of the back; sexual orifice 
below right tentacles; vent dorsal, or sub-lateral, anterior. 
: ALDERIA, Allman. 
Litymology, named after Joshua Alder, one of the authors of 
the ‘‘ Monograph on the British Nudibranchiate Mollusca.” 
Type, A. modesta, Pl. XIII., Fig. 18. 3 species. Norway, 
South Ireland, and South Wales. 
Animal oblong, without tentacles; head lobed at the sides; 
papille arranged down the sides of the back; yent dorsal, 
posterior. 
? Stiliger (ornatus), Ehrenberg; Red Sea. Vent dorsal, 
anterior. 
. CHIORZRA, Gould, 1855. 
Animal oblong; head large, pedunculated and provided with 
oral cirri; papillee foliaceous and arranged in two lateral rows; 
generative organs on the right side. OC. leonina, Puget Sound. 
FAmiIty [X,.—PHYLLIRHOIDA. 
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 cceca ; orifices 
on the right side; sexes united. 
PHYLLIRHOE, Péron and Lesueur. 
Litymology, phyllon, a leaf, rhoé, the wave. 
Synonym, Eurydice, Esch. 
Type, P. bucephala, Péron. 
Distribution, 6 species. Mediterranean, Moluccas, Pacific. 
Animal translucent, fusiform, with a lobed tail; muzzle 
round, truncated; jaws horny; lingual teeth 3.0.3; tentacles 
Jong and slender, with short sheaths; intromittent organ long, 
bifid. 
