The Opisthohranchiata of South Africa. 59 



The form of the animal longish, somewhat narrow and depressed, 

 the body quite smooth. The rhinophore-sheaths, immediately behind 

 the anterior end of the proper back, about 1-5 mm. projecting, their 

 opening obliquely truncate ; the rhinophores about 2 mm. high, the 

 club perfoliated, the lamellae rather numerous, thin. The gill rather 

 contracted, composed of 8 tripinnate leaves, situated at the posterior 

 end of the back. The tentacles short, as it were, refolded on the top. 

 The foot rather narrow throughout its whole length, rounded before 

 and behind ; the tail 3 mm. long, not extending beyond the back. 



The central nervous system quite as in allied forms. The nearly 

 sessile eyes of a diameter of 0"12 mm., with yellow lens. The otocysts 

 a little larger. In the lamellae of the rhinophores no spicules, which 

 are absent also in the skin of the body. 



The whitish mouth tube rather long (5 mm.). The bulbus 

 pharyngeus short, clumsy, 4 mm. long, whitish ; the labial disc 

 covered over by a rather strong, bright yellowish cuticle ; the rasp- 

 sheath hardly prominent. The rasp bright yellowish, containing 

 9 series of tooth plates, in the short and thick sheath 20 series, of 

 which two are not fully developed ; the total number of series 29. 

 In the series about 40 plates. The plates nearly colourless ; the 

 height of the three outermost 0'07 — 0-10 — 0-16, rising to 0-25 mm. 

 farther inwards. The outermost tooth (fig. 29a) more erect, all the 

 others of the common hook form (tig. 29) ; the innermost (fig. 28) 

 with low hook, 0'07 mm. in height. 



The yellow salivary glands about 10 mm. long, their posterior half 

 very thin, folded in the middle. 



The oesophagus short, 2 mm. long. The stomach quite free, 

 13 mm. long by a diameter of 8, filled with yellowish animal matter 

 of undeterminable nature. The intestine (26 mm. in length) running 

 from the anterior end of the stomach straight backwards to the 

 white conical anal papilla. 



The posterior visceral mass (the liver) 20 mm. long by diameter of 

 7, the anterior end obliquely truncate, the posterior a little attenuated, 

 roundish; the colour of the surface yellowish white, with a number 

 of groups of small white nodules (lobules of hermaphrodite gland) ; 

 the liver substance more yellow. The pear-shaped gall-bladder 

 4 mm. long. 



The reno-pericardial organ (renal syrinx) whitish, of a length of 

 2 mm. 



In the lobules of the hermaphrodite gland oogenous cells and 

 bundles of zoosperms. The anterior genital mass white, somewhat 

 compressed, 10 mm. long by a height of 4 and a breadth of 3 mm., 

 rather hard and difficult to examine (fig. 1). The hermaphrodite 



