608 Messrs. J. C. Melvill and J. HW. Ponsonby on 
Most akin to P. Anderssont, Ancey, this little species may 
be distinguished by the conspicuous whiteness of its lip and 
aperture. We have seen about a dozen examples, all 
uniformly similar in every detail. The superficies is perfectly 
smooth, substance clear hyaline-corneous. 
Tropidophora comburens, sp.n. (Pl. XXXII. fig. 12.) 
P. testa anguste umbilicata, conico-pyramidata, fere levi, parum 
nitida, solidiuscula, stramineo-brunnea, et castaneo-suffusa ; an- 
fractibus 5, quorum duo apicales cinereo-lividi, leves, ceteris 
ventricosis, ad suturas angustissime livido-tinctis, ultimo rapide 
accrescente, levi, spiraliter trizonato, zonis castanels, quarum 
centrali maxime distincta, nigro-brunnescente, regione umbilicari 
spiraliter pulcherrime multilirata; apertura circulari, peristomate 
albo, nitido, crassiusculo, paullum reflexo, fere continuo; operculo 
calcareo, spirali, nucleo excentrico. 
Alt. 11, diam. 10 mm. (sp. min.). 
13; ie, oll 45 A(speamay-)- 
Hab. Makawe, Zululand (Burnup). 
From the common TZ. ligata, Miill., this exceedingly 
handsome species differs, (a) in form, being narrower 
throughout, especially in the body-whorl; (0) in width of 
umbilicus, the perforation being both small and not particu- 
larly deep; (c) in clearer definition of the spiral lire sur- 
rounding the umbilicus at the base of the body-whorl; (d) in 
colour; the principal spiral band at the periphery is of a livid 
black, this being well-defined—two others, which might be 
termed secondary or spurious zones, conspicuous for suffused 
bright scorched chestnut and burnt-sepia coloration, run 
equidistantly one on either side of the central band and 
parallel with it, the effect being very pleasing. ‘The oper- 
culum is normal. Several examples. 
29 
Chondrocyclus exsertus, sp.n. (Pl. XXXII. fig. 11.) 
C. testa parva, gradata, depresso-conica, latissime umbilicata, albo- 
calcarea, periostraco omnino olivaceo contecta; anfractibus 5, 
quorum apicalis minutus, globularis, ceteris apud suturas excava- 
tulis, ventricosis, sub lente minute striatis, ultimo anfractu ex- 
panso, infra peripheriam planato-declivi, umbilico perspectivi- 
unculo; apertura rotunda, peristomate tenui, simplici, continuo, 
denique evoluto. 
Alt. 2°20, diam, 4 mm, 
Hab. Umkomaas and Umbogintwini, Natal (Burnup). 
