The Opisthobranchiata of South Africa. 3 



the whitish margin, the mantle and the sipho of somewhat brighter 

 brownish colour with spread roundish whitish spots. 



The animal has large, rather flattened tentacles, the sole of the 

 foot not narrow, with distinct margins, the wings high, meeting 

 behind and connecting with the tail ; on the mantle no aperture 

 •could be detected, the somewhat grayish gill 22 mm. long by a 

 height of 10 and a thickness of 6, nearly its half freely projecting, 

 the number of groups of lamellae about 15. 



The shell 2*3 cm. in length with a breadth of 2 and a height of 

 about 0*5 ; of quite usual form, with a thin calcified, very fragile 

 layer and a rather large cuticular margin. 



The eyes of a diameter of about 1 mm. 



The length of the mouth tube 3 mm. The bulbus pharyngeus 

 grayish, 9 mm. long, with a height and a breadth of 6. The mandi- 

 bular plates larger, meeting above and beneath, 4 - 5 mm. high with a 

 breadth of 2*25 ; their full anterior half black brownish, the rest 

 yellowish ; their staff-formed elements up to at least 0-2 mm. high 

 by a diameter at the slightly thickened upper end of 0*016. The 

 gray palate as usual, its plates with the usual thin hooks of a height 

 of up to at least 0*2 mm. The brownish yellow rasp of the broad 

 tongue containing about 36 series of plates, in the short and thick 

 sheath 10 series, the total number thus being 46 ; in the series up to 

 33 plates. The plates in the thicker parts yellow ; the breadth of the 

 median 0*28 mm.; the 4 outermost measured - 08-0 - 12-0'18, and 

 0-25 mm., the length then rising to 0'35 by a height of 0'24 mm. 

 The median plate (PI. I., fig. 1) not broad, with finely denticulated 

 hook and two denticles at its root. The two outer plates (fig. 2a) 

 without hook, the next with a small single one, the following with 

 ■denticular hook (fig. 2). The plates otherwise of the usual form, 

 with pointed finely denticulated hook and a stronger denticle towards 

 its root or (on the outside) with 2-4 (fig. 3). 



The long thin white salivary glands as usual. 



The black oesophagus 10 mm. long by a breadth of 1*25. The first 

 stomach nearly colourless, 14 mm. long by a diameter of 10, empty. 

 The masticatory stomach, brownish gray, 8 mm. long by a diameter of 

 6, two series of rather low thorns before the cardia, the facets of the 

 stomach as usual, with 8 larger and about 6 smaller plates, the larger 

 of about the same size, of a height of 3*5 mm., dirty yellow, the smaller 

 paler, less regularly pyramidal. The third stomach 5 mm. long and 

 broad, without facets, as it were. 



The brownish gray conical liver 14 mm. long by other diameter 

 of 9, the end of the long (about 4 mm.) gall-bladder freely projecting 

 on the surface of the liver. 



