XV NUDIBRANCHIATA 433 



when severed, have been described as parasitic worms. Tethys 

 feeds on molluscs and Crustacea. 



Fam. 3. Lomanotidae. — Body slug-like, dorsum prominent, 

 undulating or lobed, with one row of small cerata, no tentacles, 

 rhinophores much foliated, radula with uncinated dentate 

 laterals. Single genus, Lomanotus. 



Fam. 4. Dotonidae. — Body slug-like, small, two rows of 

 cerata, each ceras surrounded by a ring of tubercles, rhinophores 

 simple, radula uniseriate. Single genus, Doto. 



Fam. 5. Bendronotidae. — Body slug-like, somewhat com- 

 pressed, two rows of arborescent cerata, no tentacles, frontal 

 margin with arborescent papillae, rhinophores arborescent, radula 

 multiseriate. Genera: Campaspe^ Dendronotus. 



Fam. 6. Boimellidae. — Two rows of dorsal papillae, with 

 branchiform appendages at the base, rhinophores foliate, radula 

 multiseriate. Single genus, Bornella. 



Fam. 7. Scyllaeidae. — Body oblong, compressed, two large 

 foliated cerata with branchial appendages on the inner side, no 

 tentacles, rhinophores large, radula multiseriate. Single genus, 

 Scyllaea. 



Fam. 8. PhyllirrJioidae. — Body much compressed, with 

 bovine head and neck, tail tapering, no tentacles, rhinophores 

 simple, teeth few, no marginals. Single genus, PhyllirrJioe. 



Fam. 9. Pleurophyllidiidae. — Body elongate-oval, snout 

 broad, covered by an arched shield with lateral angles prolonged, 

 branchiae consisting of two rows of lamellae placed between the 

 notaeum and the foot, no tentacles, rhinophores short, hidden, 

 radula multiseriate. Single genus, Pleuropliyllidia. 



Fam. 10. Pleuroleuridae. — Animal resembling Pleurophyl- 

 lidia^ but without the branchial lamellae. Single genus, Pleu- 

 roleura. 



Fam. 11. Tritoniidae. — Body long, two rows of unequal 

 arborescent cerata, rhinophores with ramose appendages, liver 

 not prolonged into the cerata. Genera : Tritonia, Marionia. 



Section 2. Holohepatica. — Cerata medio-dorsal, retractile 

 or not, usually paucifoliate, liver never ramified, usually no jaws. 



Fam. 1. Borididae. — Branchia consisting of a circle or semi- 

 circle of pinnate leaves united at the base, surrounding the anus, 

 almost always retractile into a cavity, rhinophores foliate, no 

 suctorial proboscis, radula multiseriate. Genera: Bathydoris^ 



VOL. Ill 2F 



