Vol. 70.] REMAINS FftOM THE VICTORIA NTANZA REGION. 197 



elongately conoidal form, and furnished with about six and a half 

 whorls, the last being inflated and nearly double the length of the 

 spire, whereas the spiral volutions are of plano-convex character. 

 The aperture is suboval and of moderate proportions ; it possesses 

 a rounded outer lip, an inner lip with a central indentation, from 

 which proceeds a straight columella having behind a well-pro- 

 nounced semicircular umbilical region. Whorls obliquely costulated. 

 Dimensions in millimetres : — 



Aperture. 



Length =15. Length = 7 . 



Diameter =10. Width =5. 



In general contour, in the character of the basal cavity, the 

 presence of the straight and prominent columella, and the costu- 

 lated sculpture (obscurely preserved on the dorsal surface of the 

 penultimate whorl), the specimen corresponds with the features of 

 this species. 



Distribution. — Dr. Kobelt quotes Shoa in Abyssinia and 

 Somaliland as areas where his species occurs. 



Occurrence. — The specimen came from Bed 31 in the ' upper 

 gravel zone,' and 'close to the Dinotherinm jaw and other large 

 bones.' It is of a light- coloured marly appearance, with blackish 

 mottling. 



Locality. — Kachuku. 



Cerastus sp. indet. 



Remarks. — This specimen, with dimensions of 10 by 8 milli- 

 metres, is of small conical shape, made up of five depressed whorls, 

 which are nearly in the same plane. The whorls are ornamented 

 with a regular series of elevated and oblique costulations. 

 Mr. E. A. Smith is of opinion that this fragment represents the 

 summit-region of a shell like that characteristic of the genus 

 Cerastus, which is probably its true interpretation, although it 

 is quite impossible to suggest any particular species with which to 

 associate the specimen. 



Occurrence. — From Bed 8, associated with Tropidophora 

 nyasana and Limicolaria sp. 



Locality. — Kikongo. 



EXPLANATION OF PLATE XXX. 



r All the specimens are in the British Museum (Natural History).] 

 Ampullaeja ovata Olivier. (See p. 189.) 



Fig. 1. Dorsal view of the largest specimen (natural cast). Nira (Bed 14). 



2. Dorsal view of a medium-sized specimen, with the shell preserved. 



Nira (Bed 31). 



3. Internal surface of a large isolated operculum, regarded as belonging 



to this species. 



4. External view of the same specimen. Nira (Bed 14). 



Lanistes cabinatus (Olivier). (See p. 190.) 



Fig. 5. Front view of large natural cast. Nira (Bed 14). 

 Figs. 6 & 7. Two views of a smaller example with the shell preserved, and 

 showing obscure spiral angulations. Nira (Bed 32). 



