606 Messrs. J. C. Melvill and J. TH. Ponsonby on 
duobus ultimis levibus, nitidis; apertura ovata, peristomate 
tenui, paullum effuso, columella basin versus truncatula, tenui. 
Long. 38, lat. 19 mm. 
Hab. Lower Umfolosi Drift, Zululand (Burnup). 
Of the same group as A. penestes, M. & P., transvaalensis, 
Smith, and Livingstoner, M. & P., but very distinct from all, 
differing both in form and coloration from any described 
species. ‘The shining stramineous hue, with a blend of olive, 
is peculiar; this is periostracal, the dead white of the shell 
itself showing through in occasional patches. The upper 
whorls with aid of a lens are seen to be most finely decussate ; 
this gradually becomes evanescent, till the last two whorls 
appear quite smooth. Four examples, one immature. 
Isidora compta, sp.n. (Pl. XXXII. fig. 14.) 
TI. testa ovato-oblonga, lete electrina, nitida, delicata ; anfractibus 4, 
apicali diaphano, levi, minuto, globulari, tribus supernis casta- 
neis, omnibus tumidis, apud suturas impressis, ultimo rapide 
accrescente, sub lente arctissime longitudinaliter tenuistriato ; 
apertura ovata, peristomate paullum effuso, incrassato, marginato. 
Long. 14, lat. 6 mm. 
Hab. Boksberg, Transvaal (Burnup). 
A brightly coloured species, in which the longitudinal lines 
of growth are characteristic, opaque spaces alternating at 
intervals irregularly with subhyaline patches. It is more 
comparable with such Australian Physe as concinna, Ad. & 
Angas, or Grayi, E. A. Sm., than with any of the well- 
known South-African forms. 
Physa zuluensis, sp.n. (PI. XXXII. fig. 4.) 
P. testa rimata, rotundo-ovata, succineo-vitrea, delicatissima ; an- 
fractibus 5, supra abbreviatis, apice ipso albo-mamillato, ceteris 
ad suturas impressis, ultimo permagno, rapidissime accrescente, 
supra subsquarroso ; apertura ovato-oblonga, peristomate tenuis- 
simo, paullum apud basin prolongato, margine columellari 
crassiusculo. 
Alt. 10, diam. 7 mm. 
Hab. E. Zululand (Burnup). 
P. natalensis, Krauss, seems the nearest ally to this species, 
the very extended and strongly shouldered body-whorl being 
characteristic. 
Ancylus (Ferrissia) gordonensis, sp. n. 
(Pl. XXXL. fig. 2.) 
A. testa ovata, cornea, tenui, apud marginem pallidiore, pellucida, 
