The Opinthohranchiata of South Africa. 69 



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

 sessile eyes O'lO mm. ; neither in the rhinophorial lamellge nor in 

 the skin were spicules seen. 



The short mouth tube with the inside black. The clumsy hulhus 

 pharyngeals (fig. 8) oval in circumference, with a breadth and height 

 of 4 mm., of a length of 6, the rasp-sheath moreover projected 2 mm. ; 

 the labial disc yellowish white, the perpendicular mouth downwards, 

 with strong grayish folds ; the cheeks clothed with an especially 

 downwards strong grayish cuticle. On the upper side of the bulbus 

 the rather narrow palate shone blackish through, on each side 

 accompanied by a strong yellowish or grayish white glandular mass 

 (fig. 8). The rasp of the tongue yellow, containing (in the two speci- 

 mens) 12 series of tooth-plates, in the sheath moreover 10-12 series, 

 of which the two hindermost were not quite developed ; the total 

 number of series being thus 22-24. The median and outer plates 

 yellow ; the large lateral ones colourless, transparent ; the breadth 

 of the median plates 0-56 mm., the length of the lateral about 1 mm. ; 

 the plates, especially the lateral, were very hard. The median 

 plates (fig. 9) of usual form, but scarcely with any thickening of the 

 foremost edge ; the lateral (figs. 10-12) very clumsy, broad, some- 

 what bent, with short simple hook ; the number of outer plates was 

 5 (rather seldom 6), their form (figs. 13, 14) as usual. 



Salivary glands of the usual kind were wanting, being represented 

 by the glandular masses on the upper side of the bulbus pharyngeus. 



The oesophagus rather short. The intestine rose to the surface of 

 the hinder visceral mass (liver) at about the limit of its first and 

 second third, made some large windings on the upper and right side 

 of the genital mass, and ran on the right side of the liver to the 

 black anal papilla ; the whole length about 5 cm. by a nearly 

 constant diameter of 2-25 mm. 



The posterior visceral mass yellowish gray, 15-17 mm. long by 

 diameters of 10-9, with rounded anterior and posterior end ; the 

 cavity of the liver (stomach) rather large, its substance somewhat 

 more grayish than the surface, which was nearly quite covered by 

 the thin yellowish layer of the groups of lobules of the hermaphro- 

 dite gland. The whole of the digestive tract was quite empty. 



The hloocl gland blue, of oval form, 3-5-5-5 mm. long, rather 

 thick, composed of quite small lobules ; fixed to the bend of the 

 intestine. 



In the lobules of the hermaphrodite gland ripe sexual elements. 

 The anterior genital mass pear-shaped, narrower towards the 

 anterior end, 8 mm, long by a height and a breadth of 6-7 ; the 

 connected efferent ducts projected moreover 3 mm., were black on 



