168 WALTER E. COLLINGE. 



peripodial groove. Commencing from the head the dorsum 

 gradually rises, and at about one third of the animal's length 

 from the posterior end it slopes downwards, forming a some- 

 what spatulate-shaped tail. All the keels are well marked. 

 The radiating lines from the respiratory orifice are very 

 plain, especially those directed posteriorly ; the two mid- 

 dorsal ones are also very prominent. Peripodial groove 

 distinct. Generative orifice below and behind the right lower 

 tentacle. Foot-sole orange-red, not differentiated into median 

 and lateral planes. Tail flattened and slightly overlapping' 

 the foot-sole, terminating bluntly. Ungse small. Length (in 

 alcohol) 65 mm.; breadth of foot- sole 9-5 mm.; breadth of 

 dorsum, mid-length, 10 mm., behind respiratory orifice 

 13'5 mm. 



Shell internal, situated posterior to the respiratory orifice. 



Hab.— Richmond, Natal. Rev. J. R. Ward, 1899. Type 

 in the collection of the South African Museum. 



It is curious that this handsome species has not been found 

 again since its discovery in 1899. 



Habits and Habitat. 



Very little is known about the habits and habitat of members 

 of the genus. It seems very probable that they burrow and 

 spend most of their time underground or in trees or dense bush. 

 Their food consists of both animal and vegetable matter. As 

 already pointed out Mr. J. S. Gibbons noticed that the 

 specimen [probably referable to A. gibbon si (IT. G. Binn) ] 

 when in repose assumes a very peculiar appearance by 

 retracting the head and bending the tail portion beneath the 

 foot-sole, bringing the lateral borders of the foot-sole almost 

 together. Mr. Burnup, who has sent me a series of rough 

 sketches from life of A. burnupi, has also noticed that this 

 latter species curls itself up. 



When alive the lateral keels are not so pronounced as in 

 preserved specimens. 



