THE CARNIVOROUS SLUGS OF SOUTH AFIUCA. 203 



apex in front of the posterior margin ; sinus of moderate 

 depth ; left posterior angle obliquely truncate. 



Pedal gland (PI. XIII, fig. 53). — Slender; glandular tissue 

 gradually dying out a little behind the middle of the gland; 

 duct less convoluted posteriorly than in A. gibbonsi. 



Nervous system. — Cerebral ganglia clearly sepai-ate ; 

 buccal ganglia situated posteriorly and joined to the cerebi'al 

 ganglia by long connectives ; cerebro-pedal and cerebro- 

 pleural connectives rather long. 



Digestive System (PI. XVII, figs. 100-102 ; text-fig. 4, 

 A, p. 161; PI. XXI, fig. 131).— Radula very large, 8 mm. 

 long ; central tooth very small, absent in some i^ovvs ; others 

 scarcely diiferentiated into laterals and marginals, becoming 

 extremely large towards the edges of the radula ; cusps 

 simple, very slightly curved, short towards the centre of 

 the radula, longer towards the edges ; bases broader than in 

 A. gibbonsi; corresponding teeth not opposite to each 

 other; formula: (17 -f 1 + 17) x 48. Odontophore also very 

 large ; posterior end joined by numerous short radial buccal 

 retractors to the sides and floor of the body-cavity about the 

 middle of its length ; odontophoral support rounded in front. 

 CEsophagus short and broad, merging into a fusiform crop. 

 Between the crop and the wide intestine is an oval stomach, 

 into which the hepatic ducts open. Second loop of intestine 

 absent, the alimentai-y canal curving over to the right side 

 of the liver and then passing straight backwards. Salivary 

 glands contiguous above the crop, but less closely fused than 

 in A. gibbonsi. Liver in two approximately equal divisions, 

 the intestine only traversing the right. 



Vascular System (PI. IX, fig. 28). — Pulmonary veins 

 not very numerous. " Posterior aorta " dividing at its origin 

 into three branches which supply the left division of the liver 

 and the hermaphrodite gland ; right division of liver supplied 

 by two arteries from the anterior aorta, which arise separately 

 but close together; anterior aorta passing through loop of 

 intestine ; anterior branches of buccal artery leaving the 

 posterior branch as a single median vessel. 



VOL. 3, PART 2. 15 



