The Opisthobranchiata of South Africa. 11 



most part disappearing through large confluent or anastomosing 

 irregular black spots ; the mantle with strong spots and stripes 

 radiating from about the centre ; similar markings occurred on the 

 upper part of the inside of the foot-lobes reaching to their margin, 

 the rest being grayish white, as were also the side parts of the body 

 adjoining the mantle ; the foot grayish white. 



The form of the usual type, the foot-lobes free as far as their 

 hinder end ; tbe mantle without hole ; the siphonal mantle-fold 

 rather flat, 6 mm. long by a breadth of 2-2 ; the gill as in the 

 former species. 



The shell 22 mm. long by a breadth of 20 and a height up to 



4 mm. (fig. 1) ; the cuticular margin rather broad, else the shell 

 was yellow, rather solid, with a prominent nucleal part. 



The grayish bulbu's pharyngeus short, pear-formed, 10 mm. long by 

 a breadth and height of 9. The mahogany brown mandibles strong, 



5 mm. high by a breadth of 3 ; their elements (with a diameter of 

 0'007 to 030 mm.) high, thin, their upper point bent (fig. 20). The 

 palatal hooks nearly colourless, weak and thin, reaching to a height 

 of 0*24 m., by a diameter at the base of 0'035 (fig. 21). The strong 

 tongue contained in the yellow rasp 32 series of plates, in the 

 sheath 22, the total number of the series being thus 54. The 6 

 foremost series were very incomplete and the plates mostly damaged ; 

 the 6 hindermost in the sheath not quite developed. The number 

 of lateral plates on each side of the median was 25. The plates 

 were yellow, the breadth of the median (between the legs) 28 mm., 

 the length of the first lateral 0*26. The median plates (fig. 2) of 

 usual form with serrulated hook, and on either side of it two denticles. 

 The inner lateral plates (fig. 3) were also of the common form, 

 with serrate hook and two denticles at its base (fig. 4). 



The oesophagus was developed posteriorly into a proventricle. 

 The masticatory stomach nearly cylindrical, 9 mm. long, with the 

 usual armature, the plates faint yellowish. The grayish-brown liver 

 28 mm. long by a height and breadth of 17. 



The hermaphrodite gland yellowish white, 15 mm. broad by a 

 length of 10 and a thickness of 4-5 mm. The anterior genital mass 

 yellowish white, 15 mm. long by height of 7 and a thickness of 

 4 mm. ; the yellowish-white spermatotheca globular, of a diameter 

 of 9 mm., the pear-formed spermatocysta 2*5 mm. long. The 

 grayish penis somewhat bent, 15 mm. long ; the more whitish 

 glans conical, 4 mm. long (without armature). 



The colour of the animal, its mandibles, and perhaps the nature 

 of the palatal hooks seem to indicate a definite species. 



