THE CAENIVOEOUS SLUGS OF SOUTH AFKICA. 213 



glands separate. Liver of two approximately equal divisions, 

 the intestine only traversing the right. 



Vascular System (PI. IX, fig. 30). — Pulmonary veins 

 forming a network. " Posterior aorta " supplying left 

 division of liver and hermaphrodite gland, and sending a 

 small branch to posterior end of right division of liver; 

 remainder of right division supplied by two ai-teries from the 

 anterior aorta, which arise separately, but close together; 

 anterior aorta passing through loop of intestine. 



Reproductive system (PI. XXIII, fig. 148).— Herma- 

 phrodite gland composed of relatively smaller follicles than in 

 A. diniidia; hermaphrodite duct convoluted; common duct 

 very long, rather narrow, and much convoluted and twisted ; 

 vagina bent at I'ight angles towards its anterior end ; recepta- 

 culum seminis small ; receptacular duct greatly swollen 

 towards the anterior end. Penis moderately long ; anterior 

 part narrow and more or less twisted, posterior part broad 

 and appearing as though it were double owing to the presence 

 of a longitudinal groove along one side ; vas deferens dis- 

 appearing into this groove about 5 mm. from the posterior 

 end of the penis ; penial retractor long- and narrow. 



Habitat. — Chase Bush, Pietermaritzburg (Burnup) ; Rich- 

 mond, Natal (nearly in the centre of a rotten log; Ward). 



Type. — The type of A. burnupi is in the British Museum, 

 of A. natalensis in the South African Museum, Cape Town. 

 Another specimen will be found in the Natal Museum, Pieter- 

 maritzburg. 



Affinities, etc. — This striking form differs widely from all 

 the preceding species not only on account of its conspicuous 

 keels, but also in the double cusps of the lateral teeth of the 

 radula and the separate salivary glands. 



Apera sexangula n. s-p. 



Apera burnupi ''Smith" ; Collinge, Ann. Mag. Nat. Hist. (6th ser.), 

 1897, vol. XX, p. 221, pi. v, figs. 1-6; Pilsbry, Nautilus, 1898, vol. xii, 

 p. 12; Collinge, Ann. S. Afr. Mus.. 1900, vol. ii, p. 4, pi. i, figs. 5. 6; 

 Collinge, Journ. of Mai., 1901, vol. viii. p. 71, fig. 1 ; Collinge, Jouvn. 



