new Molluscafrom South Africa, 639 



whorled, canaliculate at the sutures, the upper disk rouuded, 

 the lower planate, deeply excavate ; the lamellar segments 

 clearly perceived radiating round the umbilicus ; the shell is 

 obtuse-angled at the periphery ; the mouth is obliquely 

 obtuse-triangular, lip simple. 



Four specimens. 



We have taken the largest specimen as the type. 



Assiminea tyttha *, sp. n. (PI. XVII. tig. 11.) 



A. testa minuta, cornea, fere Isevi, globoso-conica, solidiuscula ; 

 anfractibus quatuor, apicali obtuso, cseteris ventricosis, lougitu- 

 dinaliter indistincte striatulis, ultimo rapide accrescente, c£eteris 

 conjunctim magnitudiue superante ; apertura subrotunda ; peri- 

 stomate rotundo, simplici ; columella obliqua, crassiuscula ; oper- 

 culo rubro, littoriniformi, normab. 



Long. 1*50, lat. 1 mm. 



Hah. Howick, near Pietermaritzburg, "on the under 

 surface of the leaves of a sage-like shrub " (d/r. Burnup). 



A few specimens of a very small Assiminea, bearing some 

 likeness to A. litorina, Delle Chiaje, a native of British and 

 South -European shores. The shell is bright horny, almost 

 smooth, being indistinctly longitudinally striate, rather solid, 

 four-whorled, the apical ^Yhorl obtuse, the rest tumid, tlie 

 last whorl much larger than all the rest together; mouth 

 almost round, outer lip round, simple ; columella oblique, 

 thickened; operculum normal. 



* tvtOos, small. 



EXPLANATION OF PLATE XVIL 



Fig. L Ennea Cairnsi. 



Fig. 2. Burnuiri. 



Fig. 3. Pupa (Faula) pereximia. 



Fig. 4. Hapalus catarractee. 



Fig. 5. Trachycysfis teretimcula. 



Fig. G. Achatina Livinystonei. 



Fig. 7. draken-sheryemis. 



Fig. 8. Buliininus [Pachnoclus) carinifer. 



Fig. 9. Subiilina tuyelensis. 



Fig. 10. Plunorbis ('Segmentina) planodiscus. 



Fig. 11. Asdminea tyttha. 



