— 59 — 



and penultimate whorls indistinctly bicarinate, the last whorl inflated without 

 sign of carination, marked throughout with spiral striae crossed, especiall}^ 

 on the last whorl, with very closel}- set, transverse striae ; suture impressed, 

 umbilicus narrow, deep, half concealed b}' the outward extension of the 

 columella; columella descending in a curve, outwardly expanded and 

 spreading above into a coarse, well defined, black margined, pariétal calhis 

 which joins it with the upper margin of the labrum; labrum simple; also 

 narrowly margined with black; aperture broadly ovate; interior of shell 

 pale livid flesh-colour; operculum thin, horny, slightly concave, multispiral 

 -with subcentral nucleus. 



Alt. 17.5, diam. maj. i-j, diam. min. 10 mm. 



Aperture : ait. 9.75, diam. 7.25 mm. 



Hab. — Alli Plains, British East Africa (A. BlayneyPercival). 



Cleopatra congener sp. n. - PI. IV", fig. 6. 



Shell differing from Melania ferruginea Lea (') in having the last whori 

 less convex at the periphery and the spire less acute, in being narrowl}'' 

 umbilicate and in the shape of the aperture which, in the présent species, is 

 more roundl}' ovate, moreover the labrum is not dilated at the base which is 

 the case in ail the spécimens of the veiy large séries of M. ferricginea which 

 I hâve before me 



Alt. 20.25. diam. maj. 11, diam. min. 10 mm. 



Aperture : ait. 8, diam. 5 mm. 



Hab. — Lake Baringo, British East Africa (Robix Kemp). 



Unio (Nodularia) nyassanus Lea (-) var. hercules var. n. — 

 PI. IV, fig. 10. 



Shell much larger than the typical form, covered with a bronze-brown 

 periostracum, more rounded anteriorl}" from the imibones downwards and 

 having the posterior side more sloping above and more rostrate below. 



Long. 33.5, lat. ^i, diam. 21 mm. 



Hab. — Shire River^ near its outflow from Lake Nyassa. 



(') Proc. Zool. Soc, London, 1S50, p. 182. 



(=) Proc. Acad. Nat. Se. Philad., VIII, 1S64, p. 108. 



