166 WALTER E. COLL INGE. 



Apera gibbonsi {W. G. Binn.) ; Heyuemann, Jalirb. Deutscli. Malak. 



GeselL, 1885, Bd. xii, p. 17, t. ii, 

 figs. 5-7. 



Animal elongate, slender, cylindrical; keels absent. 



Colour a dull orange with dark brown mottling dorsally 

 and laterally; mottling almost absent in the dorso-median 

 line and entirely so latero-ventrally. 



Peripodial groove obscure. Foot-fringe and foot-sole a 

 dull orange (almost white or creamy white in alcohol), not 

 differentiated into median and lateral planes. 



Length (in alcohol) 27 mm., breadth of foot-sole 11 mm. 



Hab. — Croftlands, Equeefa, near Umzinto ; Port Shep- 

 stone ; Thornybush, near Pietermaritzburg. 



There is a considerable amount of variation in this species 

 according to the age. Young specimens, measuring from 20- 

 30 mm., are more brightly coloured and lighter. 



Apera burnupi E. A. Sin. 



Apera buruupi E. A. Smith, Ami. Mag. Nat. Hist., 1892 (ser. 6), 



voL X, p. -466; Collinge, ibid., 1897 

 (ser. 6), voL xx, p. 221, pL v; 

 Collinge, Journ. of Malac, 1901, 

 vol. viii, J). 7], fig. 1. 



The type is described (29, p. 466) as being 28 mm. long. 

 The largest example I have seen measured 79 mm. 



This is undoubtedly the commonest species of the genus. 

 Amongst the many specimens I have examined I have noted 

 but little variation. 



In some notes on appearance in life of this species, Mr. 

 Burnup writes : 



"Shape. — Elongate hexagonal, but when in motion the 

 foot hides a great part of the ventro-lateral surfaces, giving 

 the slug a more quadrate appearance. Thickest part about 

 three-fifths of the distance from head to tail, tapering gradually 

 towards the head, Avhere it is squarely truncate, and more 

 rapidly, convexly, toward the tail, ending in a point. 



"Size. — Two and a half inches long, 7 mm. wide at widest 



