TRUNCATELLINA OP SOUTH AFRICA. 97 



whorls; the size-mark on Melvill and Ponsonby's plate is 2 

 mm. long. A specimen from Pretoria measures, length 2, 

 diam. 0.8, length of aperture 0.52 mm. ; 7y 2 whorls. No doubt 

 the dimensions given by these authors are incorrect ; certainly 

 their description of the aperture could hardly be made more 

 false and misleading. For this reason, Mr. Burnup 's de- 

 scription has been quoted above. 



2Sa. T. iota mut. livingstona (Burnup). PL 10, figs. 8, 9, 10. 



Shell very similar to the typical form, 8-whorled, cylin- 

 drical, impressed at the sutures, somewhat coarsely longitu- 

 dinally striate ; aperture simple, with one internal tooth oppo- 

 site to the mouth, very obscurely designated in some speci- 

 mens, which are therefore intermediate between this variety 

 and the type. Alt. 2.02, width 0.84 mm. (Burnup, in M. & P.) . 



Transvaal: Pretoria (Connolly); subsequently found at 

 Standers Kop (Standerton) (Connolly). 



Two topotypes from Burnup measure: 



Length 2.4, diam. 0.9, length aperture 0.65 mm. ; 8% whorls. 



Length 2.1, diam. 0.83 mm. ; 7% whorls. 



Length 1.85, diam. 0.80 mm. ; 6% whorls. 



The palatal tubercle is too far in to be seen, at least in its 

 entirety, in the direct front aspect, but it comes into view 

 when the shell is turned very little, being dorsal in position. 

 There is a rather strong columellar lamella, also dorsal (fig. 

 10). Over 1% whorls at the summit are smooth, or under 

 the microscope, irregularly granulose. 



29. TRUNCATELLINA SYKESI (Melv. & Pons.). PL 10, figs. 11, 



14, 15, 16, 17. 



Shell rimate, minute, cylindric, diaphanous, with obtuse 

 apex; whorls 7 or 8, ventricose, closely longitudinally, finely 

 costulate throughout; aperture ovate, peristome a little re- 

 flected, provided with 2 teeth, one parietal, the other basal, 

 opposite and inconspicuous. (Subsequently Melvill and Pon- 

 sonby state that the teeth "are found not to have any real 

 existence, the mouth of the type having been clogged with 

 certain foreign particles"). Length 1.90, width .75 mm. 

 (M. &P.). 



