1 893.] SHELLS FROM BRITISH CENTRAL AFRICA. 639 



23. Melania MWERrENsis. (Plate LIX. fig. 12.) 



Testa elongata, acuminata, alhida, j5t«nc<is rttjis, in seriehts 

 tra'nsversis cUspositis, ornata, epidermide tenuissima ludlide oli- 

 vacea induta ; spira elongata, acuminata ; anfractus cii-citer 10, 

 fere plani, inferne ad suturam Jeviter constricti vel canalicidati, 

 flicis dbliqiiis sidcis spiralihus decussatis instructi, infra suturam 

 crasse marginati vel balteaii, idtimvs i>litis prope medium 

 obsoletis, inferne iransverslm sidcatus ; suttira 2>anim ohliqua ; 

 apertura acuminato-ovalis, superne angustata, longit. totius g 

 paulo superans ; lahrum tenue, superne late et s^diprofvnde 

 sinuatum ; columella curvata, alba, incrassata. 

 Longit. 22 millim., diam. 8; aperttira 7 longa, 4^ lata. 

 Hab. Lake Mweru {B. Crawsliay). 



I'liis species, although spotted like M. tubermlafa, is sufficiently 

 distinct from that form. The plicfe are coarser, the whorls flatter, 

 and the hp more sinuated. The spiral sulci are four in number on 

 the upper whorls and about eight on the l)ody-whorl ; they cut 

 through the obhque folds, giving them a more or less nodose 

 appearance. The red dots, which are sometimes produced into 

 short transverse lines, fall upon the ridges between the sulci, and 

 never in the grooves themselves. In some specimens the oblique 

 costse are ahnost obsolete, especially upon the last and penultimate 

 whorl. 



24. Melajtea iMiTATRix. (Plate LIX. fig. 13.) 



Testa elongata, acuminata, epidermide luteo-olivacea amicta, punctis 

 rufis paucis spnrsis picta ; anfractus 8-9, fere planiusculi, 

 costis oblique arcuatis 16-18, quadnseriatim granosis, instructi, 

 tdtimus infra medium transversim srdcatns ; apertura ovata, 

 superne acuminata, longit. totius 5 adcequans ; labrum supjra 

 late sinuatum, antice prominens ; columella inferne arcuata, 

 incrassata, alba, reflexa. 



Longit. 21 millim., diam. 8; apertura 7 longa. 



Hab. Lake M^^ {R. Craivshay). 



This specie?^ hke J/, tuberculata, but has less coai-se whorls, 

 more distinct ribbing and granulation. 



25. Melania crawshati. (Plate LIX. fig. 14.) 



Testa ang%ista, elongata, albida, epidermide pallide olivacea induta ; 

 anfractus 9, infra suturam serie conspicua, obliqua, conferta 

 ttiberctdorum cincti, infra nodidos constricti, deinde convexius- 

 cidi, lirisque tribus, quarmn suprema nodosa, spiraliter instructi, 

 uliimu^ liris drciter 9 cinctus; apertura anguste ovata; labrum 

 tenue ; columella arcuata, alba, incrassata. 



Longit. 17 millim., diam. b\ : apertura 5^ longa, 3| lata. 



Hab. Lake Mweru {B. Crawsliay). 



The row of tubercles bordermg the suture is prominent and very 

 remarkable. Beneath comes a broad constriction, below which are 

 three transverse ridges, of which the uppermost is ornamented 



