388 ^OLiD^. 



Matharena, Bergh. 

 Distr. — 1 sp. N, Europe. 

 Papillae in transverse and oblique series. 



C^ciNELLA, Bergh. 

 Distr. — G. luctuosa, Bergh. Philippines. 



Rhinophores sheathed ; dorsal papillae uniserial ; with pos- 

 terior claviform appendices ; radula uniserial. 



Cerberilla, Bergh. 



Distr. — 1 sp. Samoa Islands. 



Upper tentacles perfoliate, under tentacles elongate, dorsal 

 papillse situated on short pedicels ; jaw smooth ; teeth of the 

 radula in a single row, irregularly denticulated. 



Fiona, Alder and Hancock. 



Syn. — Oithona, A. and H. (not Baird). 



Distr. — 4 sp. Falmouth. Under stones at low-water. — Dr. 

 Cocks. F. nobilis, A. and H. (xci, 35). 



Animal elongated ; oral and dorsal tentacles linear ; mouth 

 armed with horny jaws ; gills (?) papillary, clothing irregularly 

 a subpallial expansion on the sides of the back, each with a 

 membranous fringe running down its inner side. 



Subfamily HERMJEINM. 



Branchiae papillary ; tentacles non-retractile ; mouth unarmed, 

 or with corneous jaws. 



Alderia, Allman. 



Etym — N^amed after Joshua Alder, one of the authors of the 

 " Monograph on the British Nudibranchiate Mollusca." 



8yn. — Styliger, Loven. 



Distr. — 4 sp. Norway, South Ireland, and South Wales. A. 

 modesta, Loven (xci, 36). 



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

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

 posterior. 



Ercolania. Trinchese. 



Distr. — 3 sp. Mediterranean. 



Body subcylindrical ; head small, without velum ; foot narrow, 

 with rounded anterior angles ; branchiae numerous, sprinkled 

 with whitish globules ; rhinophores long, graceful, very faintly 

 canaliculate ; anus in the middle of the back, in front of the 

 heart. 



Phyllobranchus, Alder and Hancock. 



Syn. — Lobifera and Polybranchia, Pease. 



Distr. — 5 sp. Cejdon, Red Sea, Philippines, West Indies, 

 Medit. P. orientaliSj Kel. 



