The Opisthobranchiata of South Africa. 5 



finely denticulated hook and at the base of this two pointed denticles. 

 The first lateral plates (fig. 7) with strong hook finely denticulated 

 on the margins and at its base two strong denticles. On most of the 

 lateral plates the margins of the hook were even, but at its base two 

 pointed denticles on each side ; the 4-5 outer (fig. 8) had no hook. 



The salivary glands as usual. 



The first stomach 8 mm. long by a diameter of 7, at its pylorus 

 two series of irregularly roundish facets. The masticatory stomach 

 brownish, of a diameter of 3 and a length of 2*5 mm., showing 9 

 larger and 4 smaller plates, all yellow, the first up to 1*5 mm. high, 

 of the usual pyramidal form, the later partly more conical (fig. 9). 

 The third stomach 2 mm. long, around its cardiac opening a few 

 rounded tubercles; but no thorns could be found. The liver brownish 

 gray, sackformed, 10 mm. long by diameter of 6. 



The hermaphrodite gland in colour scarcely differing from the 

 liver, in the male and female lobules ripe genital elements. The 

 somewhat compressed anterior genital mass about 5 mm. long, 

 whitish and yellowish, the sperm-oviduct 6 mm. long. The penis 

 (fig. 10) straightened out 6 mm. long, yellowish, the white glans in 

 its hinder end 1 mm. long, to its posterior end a small prostata gland 

 seemed affixed (fig. 10). 



This form represents perhaps a new species. 



3. Apl. gargantua, B. n. sp. 

 PI. I., figs. 11-21; PL II., fig. 1. 



One individual was taken on the beach at Simon's Town (2.11.99). 



Preserved in formalin it had a length of 18 cm. by a breadth of 7'5 

 and a height of 6- 7 cm., the length of the side of the head from the 

 mouth to the end of the tentacles 3 cm. (on each side) by a breadth 

 of 1'8, the tentacles and the rhinophores 7 mm. long. The mantle 

 7*5 cm. long by a breadth of 4 - 5, its sipho 2'8 cm. long with a breadth 

 of 1*8. The gill is of a length of 4 cm. with a height of 2 - 2, and 

 a breadth of 2, the number of tufts of lamellae on each side 

 about 15. The foot-wings (parapodia) reaching from the region 

 behind the rhinophores to the tail, the height of the wings on the 

 inside up to 3*5 cm. — The ground colour of the whole of the back 

 with the wings and mantle clear brownish gray with very many 

 irregular rather large white spots, the upper half of the inside of the 

 wings coloured in the same way here as on the mantle, the spots 

 often confluent in large patches, the lower part of the inside of the 

 wings whitish, the sides of the body grayish, the foot dirty yellowish 

 white. 



