34 Trajisactions of the South African Philosophical Society. 



about 20 lamellic on each side of the smooth rhachis. No caudal 

 finger. 



The inside of the mouth tube black. The whitish hulbm 

 jiharyngeus 7 mm. long by a breadth of 6 and a height of 5; 

 the pharynx black, as also were the walls of the mouth-cavity. 

 The mandibles under the black coating wax-white ; their somewhat 

 compressed elements of the usual form (figs. 12, 13) 0-20 mm. high, 

 their upper facet of a length of 006. The rasp of the tongue, dirty- 

 brown, seemed to contain about 22 rows of plates, in the sheath 17, 

 the total number of rows being thus 39 ; in the series on each side 

 of the naiTOw rhachis very likely about 60 plates. The basal part 

 of the plates reddish brown, their height reaching to about O-l mm., 

 that of the two outermost 0*14 and 016 ; their form (figs. 14, 15) the 

 usual, the outermost mostly without the denticle. 



The whitish, roundish, flattened gl. salivalis of 5 mm. diameter; the 

 gl. ptyalina very developed. 



The brownish gray liver 13 mm. long by a height of 7. The large 

 whitish kidney 12 mm. long by a height of 7 and a thickness of 2, 

 with many transverse furrows. 



The yellowish hermaphrodite gland lying on the hinder end of the 

 hver and the kidney, and continued along the upper margin of 

 the latter ; in the male and female lobules ripe genital elements. 

 The anterior genital mass somewhat compressed, 10 mm. long, 

 and, as far as could be determined, as in the typical species. 



OSCANIOPSIS, Bgh. 



R. Bergh, Die Pleurobranchiden, 1, 1897, p. 53. (Malacolog. 



Unters. V., p. 53 (-61).) 

 Vayssifere, Monogr. de la Fam. des Pleurobi'anchid^s, ii. Ann. 



des sc. nat. Zool., 8 S., xii., 1901, pp. 6-15. 

 R. Bergh, Die Opisthobranchiata der Siboga Exped., 1905, 



pp. 49-52. 



Caput discretum nullum. Notaeum a velo (scuto) frontali 

 (tentaculari) latissimo non discretum, applanatum, laeve, testa 

 nulla; tentacula sicut rhinophoria distantia, lateralia, canaliculata. 

 Rhachis branchioB serie nodulorum duplici instructa. x\pertura 

 genitalis simplex. Podarium magnum, infra massa glandular! 

 caudali mediana praeditum. 



Connectiva cerebro- et pleuro-pedalia brevia sed distincta. — 

 Mandibulffi ex dementis applanatis compositae. 



This group represents a passage from the Pleurobranchsese to the 



