1893.] SHELLS T-RO:\r BETTISTI CEyTE.VL AFRICA. 637 



A subsequent examination of 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 topical examples, and the peripheral keel winds up the 

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

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

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

 less distinct radiating striae. 



15. YiviPABus CEAWSHAYi. (Plate LIX. fig. 8.) 



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

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

 ^nirpurea ; anfractus 6, conve.viusmdi , ultimus ad periplieriam 

 forte carinatus ; apertura angulatini rotundata, longit. totius ^ 

 haud cequans ; peristoma teniie, margine columellari arcuato, 

 anr/uste rejlexo, alho-ccerideo. Opercidum normale. 



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



Hah. Lake Mweru {R. GrawsJiay). 



This species resembles V. tmicolor, Olivier, V. rohertsoni, Frauen- 

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

 pronounced keel and conspicuous spiral strise. 



16. ViviPAKUS CAPiLLACEUs, Frauenfeld. 



Hah. Angoni-Land, south end of Lake Nyasa (A. WJu/te). 



17. Cleopatra JOHNSTOisri. (Plate LIX. fig. 9.) 



Testa ovato-conica, vix rimata, epidermide olivacea induta, carinata ; 

 spira^ conica, ad apicem erosa ; anfractus 7, plani, inferne ad 

 suturam carinati, lineis incrementi curvcUis tenuihus scidpti, 

 idtimus in medio carinatus, infra carinam conve.viuscidus, in- 

 terdum canna secunda minus conspicua prope medium cinctus ; 

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

 ^ fere cequans, sordide vel ca'ruleo-albida ; penstoma continuum, 

 margine externa tenui, sujjerne haud profunde sinuato, colu- 

 mellas arcuato leviter incrassato et rejlexo. Opercidum primo 

 paucispirale, exinde concentricum, 

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

 Hah. Lake Mweru {R. Oravjshag). 



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 cariuation. 

 The operculum agrees precisely with that of C. huVnaoidcs from 

 the Nile. Named in honour of 11. if. Johnston, Esq., C.B. 



18. Cleopatra MWERUE>rsis. (Plate LIX. fig. 10.) 



Testa ovato-acum.inata , anguste perforata, suhtenuis, sordid^ 



