MOLLUSCA FROM THE SOUTHERN SUDAN. 247 



the different animals. As most collectors visit these re2;ion^: diirino- the 

 dry season, it is difficult to obtain living specimens. 



Gebel En: one example similar to the holotype but bleached^ alt. 61, 

 diam. 25 mm. 



Renk : here I secured thirteen specimens especially characterised by 

 their large size and distinct light brown flammules. The biggest has ten 

 whorls, and measures, alt. 75, diam. 30, aperfc. alt. 28, diam. 3 3 mm. This 

 is really a large typical specimen ; it is similar to a shell figured bv 

 Dr. Kobelt (Martini u. Chemnitz, Syst. Conch. -Cab. ed. 2, vol. i. p. 71, 

 pi. 23, fig. 3), which he regards as a variety of L. sennaariensis. The 

 longest shell measures, alt. 79, diam. 28 ; apert. alt. 28, diam. 12 mm. This 

 is slightly larger than fig. 4 o£ Dr. Kobelt. Another individual is still more 

 slender, measuring alt. 70, diam. 24 mm. Specimens were taken by Herr 

 Hagg at this localitj^, one of which he refers to Dr. Kobelt\s fio-. 4 and 

 names var. crassior. His shell has the aperture somewhat wider than mine. 



Mashra Zarafa : nine examples all slender, two with slightly convex 

 whorls and especially resembling var. candidissima in shape, but distinctlv 

 streaked with brown. The others have more flattened whorls : one is semi- 

 transparent and pure white ; it is, however, uncertain whether it is reallv an 

 albino. It measures, alt. 48, diam. 18 mm. 



Kakii : seven very beautiful shells. One is typical, the others are more 

 slender ; they are distinguished from those from Renk by liaving the body- 

 whorl more flattened and elongated. They have on the whole rather broad 

 distinct brown flammules ; on one example^ however, these are finer and 

 more broken. This last has nine whorls, which measure alt. 69, diam. 

 25 mm. Another shell is bleached, with only faint yellowish flammules on 

 the body-whorl ; it is almost identical in shape and dimensions with Shuttle- 

 worth's figure of the holotype of L. candidissima. 



Kodok, one ; Lul, one, bleached ; Duleb, one good example of the typical 

 form and one of var. candidissima. 



Lake Shambe : here we have a very distinct group of five shells possessing 

 especially dark flammules close together, somewhat convex whorls, with an 

 impressed line below the suture on the body-whorl, which in two cases has 

 begun on the penultimate whorl. All are referable to the holotype, but 

 they vary slightly in their spiral angle. The broadest measures, alt. 54, 

 diam. 23 mm. ; a more slender shell has an alt. of 60*5 nmi. with the same 

 diameter. 



Kanisa, two of typical form ; Malek, one, var. candidissima; Sheik Tombe, 

 one ; Kiro, one ; Mongalla, six specimens, of which five are small typical 

 examples, the sixth is more elongated, alt. 55, diam. 20*5 mm., and is very 

 like Dr. Pilsbr^'s figure of the var. smitlii ; Lado, three near the holotype. 



Rejaf Wooding Station : about twenty, mostlyyoung, two typical, the others 



