The Opisthobranchiata of South Africa. 53 



The genital system very little developed, the penis apparently 

 unarmed. 



This form does not seem to belong to any of the hitherto estab- 

 lished genera or even families of the cryptobranchiate Dorididse. 



Genus (?). 



Doris (Gen. ?) perplexa, B. n. sp. 

 PL VI., figs. 5-6. 



Off Cape St. Blaize (N. by E. 8f miles) a specimen was taken by 

 large trawl from a depth of 39 fms. on stony bottom, and in company 

 with the Doriopsilla capensis. 



It was very hardened but soft, coloured uniformly whitish, the 

 back anteriorly slightly grayish brown. It was 25 mm. long by a 

 height and breadth of 7*5 ; the breadth of the foot 4 mm. 



The form longish, highest in the middle of the length, the quite 

 smooth back separated from the sides by a narrow white margin ; 

 the rhinophores well in front, 2 mm. high, with the club bent some- 

 what backwards ; the gill placed quite behind, 3 mm. from the end 

 of the body, formed by 6 simply pinnate leaves about 1*5 mm. high ; 

 the tentacles very small lobes ; the foot rounded in front ; the brim 

 rather narrow, the tail very short, passing into the back without 

 distinct demarcation. 



The central nervous system as usual. The diameter of the eyes 

 0*12 mm. No spicules in the skin. 



The mouth tube 4 mm. long. The whitish bulbus pharyngeus 

 5 mm. long by a height of 4-5 and a breadth of 35 ; the rasp-sheath 

 large, projecting downwards ; the lip disc with a rather strong, 

 nearly colourless cuticle. The rasp of the large tongue nearly 

 colourless ; the number of series of plates could not be determined. 

 The series seemed to contain up to 46 plates on each side of the 

 inconspicuous rhachis. The plates nearly colourless ; the length of 

 the basal plate of the innermost 010 mm. ; that of the 4 outermost 

 (fig. 6) was 0-08-0-12-0-18-0-22, rising to 0-37. They were of the 

 common hook form, with wing of the basal plate (fig. 5). 



The white salivary glands very long. 



The stomach 5 mm. long by a breadth of 2. The intestine 

 17 mm. long by a breadth of -5-0*75, filled with indeterminable 

 animal matter with masses of needle-shaped pellucid spicules. The 

 large yellowish white liver, conical, 15 mm. long by a breadth of 5. 



