1893.] SHELLS FROM BRITISH CEIfTEAL AFRICA. 637 



A subsequent examination o£ the animal has apparently proved 

 that there is not sufficient reason for separating it. The present 

 species is remarkable for its conical spire, the conspicuous keel 

 around the middle of the body-whorl, and its somewhat wide 

 umbilicus. In shells belonging to the variety, the whorls are 

 almost flat and without the shouldering at the upper part observ- 

 able in typical examples, and the peripheral keel winds up the 

 spire above the suture, producing a decided pagoda-like appearance. 

 The operculum is thiu, concentrically striated as usual, and also 

 exhibits (especially upon the inner glossy surface) some more or 

 less distinct radiatins: striae. 



-'& 



15. ViviPAEUs CEAWSHATi, (Plate LIX. fig. 8.) 



Testa ovata, conica, rimata, carinata, cornea, epidermide temd, 

 olivacea, spiraliter et oblique striata, induta, versus apicem rubro 

 purpurea ; anfractus 6, convexiuseuli, xdtimus ad peripheriam 

 forte carinatus; apertura anffulatim rotimdata, longit. totius g 

 liaud cequans ; peristoma tenue, margine columellari arcuato, 

 anr/uste rejlexo, albo-cceruleo. Operculum normale. 

 . Longit, 18| millim., diam. 13 ; apertura 9 longa. 

 Hab. Lake Mweru {R. Craivshay). 



This species resembles V. unicolor, Olivier, V. robertsoni, Frauen- 

 feld, and a few others, but may be distinguished by its much more 

 pronounced keel and conspicuous spiral strife. 



16. ViviPARUS CAPILLACE0S, Frauenfeld. 



Hab. Angoni-Land, south end of Lake .Nyasa {A. Wliijte). 



17. Cleopatra johnstoni.- (Plate LIZ. fig. 9.) 



Testa ovato-conieci, viv rimata, epidermide olivacea induta, carinata ; 

 spira conica, ad apicem erosa ; anfractus T, plani, inferne ad 

 suturam carinati, litms incrementi curvatis tenuibus scidpti, 

 ultimus in medio carinatus, infra carinam convexiusculus, in- 

 terdum carina secunda minus conspicua prope medium cinctus ; 

 apertura ovata, superne et infra leviter acuminata, longit. totius 

 g fere cequans, sordide vel cceruleo-alhida ; peristoma continuum; 

 margine externo tenui, superne Jiaud p>^'ofunde sinuato, colu- 

 mellari arcuato leviter incrassato et reflexo. Operculum prima 

 paucispirale, exinde concentricum. 

 Longit. 17 millim., diam. 10 ; apertura 8 longa, 6 lata. 

 Hab. Lake Mweru (R. Craivshay). 



This is a very interesting species and recalls the general aspect 

 of soaie of the North-American Pleuroceridce. Two of the three 

 specimens at hand have the second feebler keel upon the body- 

 whorl, and it is situated just below the peripheral carination. 

 The opei'culum agrees precisely with that of C. bulimoides from 

 the Nile. Named ia honour of H. H. Johnston, Esq., C.B. 



18. Cleopatra mweruensis. (Plate LIX. fig. 10.) 



Testa ovato-acuminata, anguste perforata, subtenuis, sordid^ 



