374 DORIDIDA. 
Body ovate or rounded, cancellate above and set with tubercles ; 
tentacles none; branchig simply lamellate ; anal aperture nearly 
central; foot wide, anterior margin strongly emarginate ; labial 
armature of small hooks. 
DoRIDUNCULUS, Sars. 
Distr.—D. echinulatus, Sars. Norway, ete. 
Mantle short, broad, with elongate spicula; two longitudinal 
ridges on its back; gills not retractile. 
Pratyporis, Bergh. 
Distr.—16 sp. West Indies, Philippines, Mediterranean. P. 
argo, Linn. 
Body flattened, coriaceous, rigid, minutely granulated on the 
back; branchial opening stellate; anterior margin of foot 
bilabiate, superior lip profoundly cut; no labial armature. Den- 
tition: no rachidian teeth, pleure multidentate, teeth hamate. 
Peroporis, Bergh. 
Distr.— P. atromaculata, Bergh. Naples. 
Body subdepressed, oval, rather rigid, minutely granulate 
above; tentacles finger-like; branchial aperture rounded ; 
branchiz paucifoliate, tripinnated ; labial armature none. 
Creprpoporis, 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. 
Tuorpisa, Bergh. 
Example.— T maculigera, Bergh. 
Form of body and radula nearly asin Discodoris ; back almost 
villous; no labial armature. 
Trippa, Bergh. 
Eaample.—T. ornata, Bergh. 
Form of the body depressed, smooth, tuberculate above and 
the tubercles villous; tentacles small; foot wide; no labial 
armature. 
HAtcerpDA, Bergh. 
Example.—H. formosa, Bergh. 
Body subdepressed, subridged, smooth above; branchial aper- 
ture ovate; branchiz sparsely tripinnate ; tentacles none ; foot 
narrow; no labial armature. 
ATAGEMA, Grube. 
Distr.—A. carinata, Quoy (xe, 99).. New Zealand. 
Mantle with longitudinal ridge on the back ; tentacles clavate, 
retractile ; gills very small. 
