3H DORIDlDiE. 



Body ovate or rounded, eancellate above and set with tubercles ; 

 tentacles none ; branchiae simply lamellate ; anal aperture nearly 

 central • foot wide, anterior mai-gin strongly emarginate ; labial 

 armature of small hooks. 



DoEiDUNCULUS, Sars. 

 Distr. — D. echinulatus, Sars. Norway, etc. 

 Mantle short, broad, with elongate spicula ; two longitudinal 

 ridges on its back ; gills not retractile. 



Platydoris, Bergh. 



Distr. — 16 sp. West Indies, Philippines, Mediterranean. P. 

 argo^ Linn. 



Body flattened, coriaceous, rigid, minutely granulated on the 

 back ; branchial opening stellate ; antei'ior margin of foot 

 bilabiate, superior lip profoundly cut ; no labial armature. Den- 

 tition : no rachidian teeth, pleurae multidentate, teeth hamate. 



Peltodoris, Bergh. 



Distr. — P. atromaculata, Bergh. Naples. 



Body subdepressed, oval, rather rigid, minutely granulate 

 above ; tentacles finger-like ; branchial aperture rounded ; 

 branchiae paucifoliate, tripinnated ; labial armature none. 



Crepidodoris, Pagenstecher. 

 Example. — C. plumbea, Pagenst. 



Gills twenty-two, most of them arranged in the figure of a 

 horseshoe, a few at the end placed more inwards. 



Thordisa, Bergh. 

 Example. — T. maciiligera, Bergh. 



Form of body and radula nearly as in Discodoris ; back almost 

 villous ; no labial armature. 



Trippa, Bergh. 



Example. — T. ornata., Bergh. 



Form of the body depressed, smooth, tuberculate above and 

 the tubercles villous ; tentacles small ; foot wide ; no labial 

 armature. 



Halgerda, Bergh. 



Example. — H. formosa^ Bergh. 



Body subdepressed, subridged, smooth above; branchial aper- 

 ture ovate ; branchiae sparsely tripinnate ; tentacles none ; foot 

 narrow ; no labial armature. 



Atagema, Grube. 

 Distr. — A. carinata, Quoy (xc, 99). New Zealand. 

 Mantle with longitudinal ridge on the back ; tentacles clavate, 

 retractile ; gills very small. 



