Freshwater- Shells from Central Africa . 
163 
Ennea curvilamella. (PI. VI. fig. 8.) 
Testa tenuis, subpellucida, pupiformis, superne eonoidea, haud ri- 
mata, albida ; anfraetus 8, convexiusculi, costulis tenuibus 
obliquis instructi, in interstitiis microscopice spiraliter interrupt© 
striati ; apex obtuse conoidalis, laevis ; anfr. ultimus antice leviter 
ascendens, pone labrum profunde effossus ; apertura parva, longit. 
totius -jt adsequans, dentibus duobus munita ; perist. album, 
paulo dilatatum et reflexum ; columella intus lata. 
Longit. 8|- millim., diam. 4 ; apertura 2| longa, 2 lata. 
55 fif 55 55 „ 2| ,, 2 ,, 
Hah. Mamboia, at an altitude of 4000 to 5000 feet {Last ) . 
Of the two teeth in the mouth of this species one corresponds 
to the indentation behind the outer lip, the other, which is 
lainelliform, prominent, and curved, is on the body-wall and 
almost joined to the extremity of the labrum. The ends of 
the fine riblets give a pretty denticulate appearance to the 
suture. The microscopic strise do not extend from riblet to 
riblet, but appear to be only on the left side of the riblets 
when the shell is examined with the spire upwards. 
Ennea consociata. (PL VI. fig. 9.) 
Testa pupiformis, superne obtuse eonoidea, albida, parumnitida; 
anfract. 8, convexiusculi, sutura profunda sejuncti, oblique for- 
titer striati, ultimus antice paulo ascendens, pone et infra aper- 
turam scrobiculatus ; apertura subquadrata, ringens, dentibus 4 -5 
albis, inaequalibus, instructa, longit. totius 1 paulo superans; 
perist. album, sublate dilatatum et reflexum. 
Longit. 7 millim., diam. 3J ; apertura 2£ longa, 2-J- lata. 
Hob. Kidete {Emin). 
This is a more slender shell than E. consanguinea , diffe- 
rently striated, and it has different teeth in the aperture. Of 
these one on the outer lip is almost double, a second strong 
tooth is situated on the columella, a third smaller one within 
the lower margin, a fourth much curved, hollowed out, lamel- 
lar one adjoining the outer lip above, and, finally, a sixth 
minute denticle occurs above the large central tooth on the 
labrum. 
Ennea cequidentata. (PI. VI. fig. 10.) 
Testa parva, cylindracea, superne paulo latior, ad apicem obtusa, 
albo-pellucida, nitida ; anfract. 6, convexiusculi, lsevigati, superne 
ad suturam subprofund am minute denticulati, ultimus penultimo 
angustior, prope aperturam longitudinaliter striatus, utrinque et 
infra scrobiculatus ; apertura subquadrata, quadridentata, alba, 
