Beinr^ Transactions of the S. Afr. Phil. Society. Vol. XVII. 65 



The (five) specimens sent, very hardened, varied in size from 17 to 

 23 mm. The largest was 12 mm. broad by a height of 7, the brim of 

 the back 4 mm. broad, the breadth of the foot 7, the 6 gill-leaves 

 3 mm. high. The colour as above. Two individuals showed a few 

 roundish small patches on the back. 



The skin of the back quite as above. So, too, the thin btilbus 

 pharyngeus. The liver sausage-shaped, 8 mm. long by a breadth 

 of 5, the cleft in the hinder end 2-5 mm. long. 



DORIDID^ PHANEEOBRANCHIAT^. 

 R. Bergh, System, I.e., 1892, pp. 1129-1160. 



Dor. phanerobe. non suctgri^s: s. Polycerid^. 

 R. Bergh, I.e., pp. 1133-1147. 



TRIOPA, Johnston. 



Johnston, Miscell. Zool. Ann. of Nat. H., 1, 1838, p. 123. 

 R. Bergh, On the nudibr. gaster. Moll, of the North Pacific Oc, 

 ii. (Dall, Sc. res. of the explor. of Alaska, ii.), 1880, pi. xiii. 

 (v.), figs. 15-20; pi. xiv. (vi.), figs. 21-22; pi. xv. (vii.), 

 figs. 12-13. — System d. nudibranch. Gasteropoden., I.e., 1892, 

 p. 1139; I.e., 1905, pp. 185-187. 

 Corpus vix depressum ; limbus frontalis angustior cirrhis granu- 

 losis ornatus, margo dorsalis cirrhis subclavatis instructus ; rhino- 

 phoria retractilia clavo perfoliato ; branchia paucifoliata foliolis 

 tripinnatis ; tentacula sat brevia obtusa canaliculata. 



Armatura labiahs et malaris nulla. Radula sat angusta rhachide 

 nuda ; pleuris dentibus lateralibus duobus majoribus et serie 

 dentium externorum quorum modo intimus hamo rudimentario 

 praeditus. 



Glans penis armata. 



The rather narrow frontal brim is provided with somewhat 

 granular appendages, and the margin of the back with more club- 

 shaped ones ; the gill is formed of a few (3-5) tripinnate leaves. 

 The lip disc is clothed with a simple cuticle. The rasp of the tongue 

 not broad ; the rhachis naked ; the pleurae contain two large lateral 

 plates and a series of smaller flattened plates. The glans of the 

 penis armed with series of hooks. 



Some few species of the genus are known . — 



1. Tr. clavigera (O. Fr. Miiller). 

 M. Atlant., Mediterr. 

 5 



