in opposite direction, united on the keel. Aperture a little oblique, sub- 

 rhomboidal, angular at the keel, peristome thin (not quite developed), 

 thickened and reflected at the columella, thus nearly covering the per- 

 foration. 



Diam. maj. 4 ! / 2 , alt. nearly 5; apert. alt. 2'/ 2 , lat. nearly 2 1 / 2 mill. 



Upper part of Sermorvai-river, April 1, 1911, 



This species is allied to S. anthropophagorum Hedl., but the new 

 species is considerably higher in proportion to its breadth, the keel is 

 much fainter, the last whorl more rounded near aperture, the keel is 

 crenulate. According to Hedley the altitude of his species is 5'/ 2 , the 

 diameter 6 ] / 2 mill. 



Fam. Helicidae. 



Plants pi i' a Beck. 



1. Planispira karri Pfeiffer, 'juri.? 



Pfeiffer. Proc. Zool. Soc. Lontf. 1847, p. 228. Pfeiffer. Mou. Hel. Vol. I, \k 38(5. 



Zoutbron, June/ July 1910. 



The only specimen is very young; according to Gude it may belong- 

 to P. karri Pfr. 



2. Planispira (Cristigibba) pianissimo, n. sp., PL I, fig. 5. 



Shel] much depressed above, less so below, spire sunken at the centre, 

 umbilicate, rather dull, perhaps on account of its slightly worn state, 

 buff-coloured on nucleus and part of last whorl above, lighter on part 

 of base ; the upper post-nuclear whorls, about the last third of last whorl, 

 the last part of base behind aperture below, the last part of the interior 

 of aperture and the whole peristome are dark blackish-purple. Whorls 

 about 4 ! / 2 , convex, separated by a deep suture, which is accompanied 

 on last whorl by a shallow groove, at a distance of 1 to 1 '/ 2 mill, from 

 the suture, the latter slightly descending near the aperture ; sculpture 

 consisting of conspicuous, rather distant growth-lines, with much finer 

 ones between them ; moreover the last part of penultimate whorl and 

 the whole last whorl bear irregular, impressed, subspiral grooves, till on the 

 outer part of peristome. Umbilicus, moderate, pervious. Aperture very 

 oblique, depressedly lunate, peristome widely and flatly expanded from 

 above till the basal margin, basal and columellar margins reflected, the 

 latter expanded at its upper part and partly covering the umbilicus ; a 

 canal just behind the peristome at the base of shell, running into the 

 umbilicus, is bordered by a gibbosity. 



Diam. maj. 27, alt. 11; apert. alt. 8, lat. 11 mill. 



