Fam. 8. Phyllirrhoidae.—Body much compressed, with bovine head and neck, tail tapering, no tentacles, rhinophores simple, teeth few, no marginals. Single genus, Phyllirrhoe.
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, Pleurophyllidia.
Fam. 10. Pleuroleuridae.—Animal resembling Pleurophyllidia, but without the branchial lamellae. Single genus, Pleuroleura.
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. Dorididae.—Branchia consisting of a circle or semicircle 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, Hexabranchus, Archidoris (Fig. [289]), Discodoris, Diaulula, Cadlina, Centrodoris, Platydoris, Chromodoris, Miamira, with many sub-genera.
Fig. 289.—Doris (Archidoris) tuberculata L., Britain: a, anus; br, branchiae surrounding the anus; m, male organ; rh, rh, rhinophores. × ⅔.
Fam. 2. Doriopsidae.—Branchia and rhinophores as in Dorididae, oral aperture pore-shaped, suctorial, no radula. Single genus, Doriopsis.
Fam. 3. Phyllidiidae.—Body oval, depressed, leathery, a ring of branchial lamellae, only interrupted by the head and genital papilla, under the pallial edge, oral aperture pore-shaped, suctorial, no radula. Genera: Phyllidia, Fryeria. Bergh unites this and the preceding family in the group Porostomata, which, with Fam. 1, form the group Dorididae cryptobranchiatae.