36 Transactions of the South African Philosophical Society. 



margin with about 20 small prominences, of which 3-4 on each si e 

 ha.ve a knotted appearance (fig. 16). The shield as well as the 

 whole of the back are otherwise rather flat, quite even. The 

 distance between the base of the rhinophores 1 cm. ; the brim of 

 the back rather projecting over the tail, rounded behind. The 

 proebranchial papilla strong, not cleft ; before it the prominent 

 vulva. The gill rather pointed behind, its half freely projecting, 

 the number of lamellae about 40, the vesicles at their base small ; 

 the renal and the anal pore as usual. The foot rounded in front 

 with a fine marginal furrow, its brim rather broad (5 mm.) ; the tail 

 rather long, on the outside scarcely any trace of a gland visible. 



Half of the bulbus pharyngeus projected freely in front. The 

 bulbus of a length of 14 by a breadth of 10 and a height of 9*5 mm. 

 of the usual form. The mandibular plates whitish, thin and very 

 brittle ; their elements reaching a length of 0'06 mm. by a height of 

 0-025, of the usual form, the denticulation very slight (fig. 17) or want- 

 ing. The palate of the mouth-cavity black. The tongue with yellow 

 rasp, which seemed to contain about 40 series of plates ; the number 

 of the series in the sheath could not be determined on account of the 

 hardened and brittle state of the whole of the tongue and especially 

 of the sheath. The number of plates in the series could not be 

 determined, but exceeded 100. The lower part of the plates 

 brownish yellow, the rest nearly colourless ; their height was up 

 to 0*63 (measured from the anterior end to the point), the length of 

 the innermost 0*58, of the three outermost - 10-0 , 16-0 - 25 mm. 

 The plates were different from those of other known Oscaniopsis, 

 nearly quite as in the Pleurobranchsea, provided with a long pointed 

 denticle (figs. 18, 19), only the 4 outermost had no such denticle 

 (fig- 20). 



The central nervous system as usual ; the cells reaching a diameter 

 of 0-2 mm. The eyes of a diameter of - 30 mm., with large 

 yellow lens. 



The white salivary glands (gl. salivales) roundish (fig. 21), button- 

 like, with deep hilus, one touching the other in the midline; together 

 they measured 4*5 mm. in diameter, the white ducts with the usual 

 ampulla at some distance from their end. The supplementary 

 salivary gland (gl. ptyalina) very developed, its duct whitish. 



The black oesophagus 6 mm. long by a diameter of 2-4 ; the inside 

 also black, with fine longitudinal folds. 



The grayish stomach 7 mm. long by a diameter of 4. The 

 intestine as usual. The contents of the stomach and of the intestine 

 were indeterminable animal matter. 



The liver brown, 10 mm. long by a breadth of 4 and a height of 6; 



