THK CARNIVOROUS SLUGS OP SOUTH AFRICA. 2Ul 



conspicuously barbed on the lower side ; apophyses promi- 

 nent ; formulae of two specimens (the second slightly imma- 

 ture) : (20 + + 20) X 44, (21 + + 21) x 38. Anterior 

 aorta passing- through loop of intestine (text-fig. 5, d, 

 p. 183); pulmonary veins not very numerous. Penis long 

 and twisted. Other characters agreeing with those of 

 A. gibbon si 6\ .v. 



Habitat. — Port Shepstone, Natal (Burnup). 



Var. duplex n. var. 



Characters. — Back distinctly mottled, with a well-marked 

 paler median band, the coloration being very similar to that 

 of Apera gibbonsi s.s. Cusps of teeth rather longer than 

 in the typical form of the subspecies, and having an additional 

 barb on the upper side near the point (excepting in the 

 smaller teeth) ; apophyses very prominent; a vestigial central 

 tooth is present in most of the rows (text-fig. 3, e, p. 159) ; 

 formula: (22 + (1) + 22) x 42. Otherwise similar to the 

 Port Shepstone specimens of A. gibbonsi 1 up at a. 



Habitat. — Port St. John's, Pondoland (one specimen ; Mrs. 

 E. Warren). 



Type. — The types of subspecies and variety are in the 

 Natal Museum, Pietermaritzburg. Another specimen of the 

 subspecies will be found in the British Museum. 



Affinities, etc. — This subspecies is especially characterised 

 by its large barbed teeth. The course of the anterior aorta 

 also serves to separate it from the typical form of Apera 

 gibbonsi, as well as from A. g. rubella. But although 

 the average shape of this subspecies is slightly different from 

 either of these forms, the differences are so small that 

 in practice I find that it is quite impossible to distinguish, 

 without dissection, light specimens of the present subspecies 

 from A. gibbonsi s.)<., and dark examples from A. g. 

 rubella, unless, perchance, the odontophore is sufficiently 

 protruded to enable one to see the teeth. It follows, there- 

 fore, that none of these three forms can be identified with 



