South- African Land- Mollusca. 57 7 



suffieientlj well-preservcil to show the tonn of the sj/uics, 

 u (K'tail which is so important in these Atiican genera. 



The nidiihi (IM. Vll. tigs. 1 a-1 c) is interesting for its 

 simihirity to tliat of A', inunctus in having quite a number of 

 aculeate laterals ; these pass towards the margin, and at about 

 the thirty-tifth touth from the edge into the bicuspid form, 

 with the inner point ihe longest. The arrangement is about 

 SO . 3 . 13 . 1 . la . 3 . 80 = 96 . 1 . 9(5. 



Tlie jaw has a central projection. 



Of ^io. 1-1 Burnup says : " possibly the same species as 

 No. 11." 



Of No. 11 : " These, I should think, will belong to the same 

 as the largest of No. 10 and No. U." 



Ktrkophorus leucospi'ra, Pfr. (PI. XVI. figs. 1-1 6, animal ; 

 PI. XVIL tigs. 1-4.) 



Localiti/. Tongaat (//. C. Burnup); twenty specimens. 



►Shell thin, imperforate, globose ; sculpture smooth and 

 glossy to the eye, under high power microscopic, regular, 

 line longitudinal striation ; colour pale sap-green when 

 animal is removed; spire low, apex flatly conoid; suture 

 shallow; whorls 4, regularly but rapidly increasing to the 

 last, which is tumid and well rounded on the periphery ; 

 aperture semioval, higher than the breadth ; peristome very 

 thin ; columellar margin weakly concavely rounded. 



tSize : major diam. ii'75 ; alt. axis 6 mm. 



Animal (L*l. XVI. figs. 1-1 h). — Before this is removed 

 from the shell the contrast of the black and white on the 

 visceral sac is very striking and characteristic of this species, 

 for it shows through the thin shell (fig. 1), and it appears 

 black beneath, with a very narrow edging of same colour 

 next the suture of the second and third whorls, the first two 

 apical whorls being wholly white. 



The foot is divided on the sole and has a long overhanging 

 lobe above the mucous pore. There is a peripodial margin, 

 with two grooves above. The right shell-lobe (PI. XVI. 

 figs. 1 & 1 a) is narrow, elongate, and tongue-shaped ; it is 

 given off from the side of the right dorsal lobe just below 

 the rectum, and in life is evidently extensible for a consider- 

 able distance over the upper surface of the shell, as in many 

 species of Macrochlamys. (In the specimen figured (tig. 1 u) 

 the lobe terminates in two points, quite an abnormal case, 

 and one, alter examining hundreds of specimens, 1 have never 

 seen before.) Tiiere is a long, narrow, finely pointed left 

 shell-lobe (1^1. XVI. fig. 1 h), also extensible, given off from 



