Freshicater- Shells from Central Africa. 167 



the suture, but arc most distinct around the umbilical depres- 



sion. 



Ennea pecuUaris. (PI. VI. fig. 18.) 



Testa parva, pupiformis, vix rimata, albida vel pallide straminca, 

 iiitida, striis coiifertis, oblique curvatis, conspicuis sculpta; anfract. 

 7, apicalcs duo lavif^ati, superiie obtusi, cii'tcri couvexi, sutura 

 leviter obliqua, profundiuscula juncti, ultimus antice coutractus, 

 pone labrum baud profunde scrobiculatus ; apertura parva, 

 longit. totius -J adivquans, supcrne pcculiariter sinuata, deutibus 

 tribus munita ; perist. leviter incrassatum, subrclloxum, margini- 

 bus callo tenui junctis, dextro superne circulariter sinuato. 



Longit. 4 millim., diam. 2 ; apertura 1 longa et lata. 



Hah. Mamboia, at an elevation of 4000 to 5000 feet {Last). 



Tiie peculiar, almost circular sinus at the upper part of the 

 aperture is formed by the outer lip bending forward in the 

 middle into a tooth-like projection, which is almost met by a 

 prominent but not very thick tooth on tiie whorl and adjoining 

 the termination of the labrnm. The third denticle is small 

 and situated within the lower margin of the aperture. The 

 columella at the upper part seems to exhibit far within a 

 broad horizontal plate, but being so far within the aperture, it 

 is not easily detined. 



EXPLANATION OF THE PLATES. 



Plate V. 



Figs. 1, 1 a. Ilyalinia Lasti. 

 Fig. 2. ILiialinia Eyniniana. 

 Fig. 3. Trochu7ianina mmnboieiisis. 

 Fig. 4. Trochonanina episcopalis. 

 Fig. 5. Bulimus [lihachis) usagaricus. 

 Fig. 6. Bulimus {Rhachis) quadricingulattis. 

 Fig. 7. Bulimus (Cerastus) mamboiensis. 

 Fig. 8. Bulimus [Cerastus) Emini. 

 Fig. 9, Bulimus (Cerastus) kidetensis. 

 Fig, 10. Bulimus (Cerastus?) uniplicatus. 

 Fig. 11. Bulimus (Cerastus?) introversus. 

 Fig. 12. Bulimus {Hapalus) subvirescens. 

 Fig. 13. Bulimus [Hapalus) disparilis. 

 Fig. 14. Bulimus (^Hapalus) associatus. 

 Fig. lo. Stenogyra (Stibulina) subcarinifera. 

 Fig. 16. Stenogyra {SubuUna) mamboiensis. 

 Fig. 17. Stenogyra (^SubuUna) usayarica. 

 Fig. 18. Stenogyra (Subtdina) Lasti. 

 Fig. 19. Stenogyra (Subulina) Emini. 

 Fig. 20. Stenogyra (Opeas) stenostoma. 



