1927] Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 121 
Planorbia albertensis was very briefly and quite insufficiently described 
by Moore in 1901 (‘To the Mountains of the Moon,’ p. 260) as follows: 
“A very planorboid-looking shell, which, when examined, was found to 
be much more solid and heavy than any other Planorbis that is known. 
It subsequently turned out not to be a Planorbis at all, but an entirely 
new form, to which I have given the generic and specific name of Plan- 
orbiaalbertensis.”’ In the Proc. Zoél. Soc. London for 1901 (II, D. 468), 
however, Moore says that the small shell from Lake Edward which he at 
first took to be a heavily-built Planorbis “is in reality a modified 
Melania.” There is some probability that it is the same species as 
a: b . C 
Gg e f 
Fig. 6. Planorbis smithi Preston. Upper figures, specimen from Kabare, Lake 
Edward; lower figures, paratype. > 1}4. 
Preston’s Biomphalaria smithi, which was also described from spec- 
imens obtained by J. E.S. Moore in Lake Edward and of which we 
have a paratype before us. 
Germain synonymizes P. smithi with P. choanomphalus, but com- 
parison with a specimen of that species from Lake Kivu shows it to be 
amply distinct. 
Planorbis sudanicus 1). v. Martens 
Text Figure 7 
Planorbis sudanicus E. v. Martens, 1870, Malakoz. Blatter, XVII, p. 35 (type 
locality: region of the Bahr-el-Ghazal'); 1870-76, in Pfeiffer, ‘Novit. Conchol.,’ 
IV, p. 23, Pl. cxrv, figs. 6-9. E. A. Smrrx, 1880, Proc. Zool. Soc. London, p. 349; 
1881, op. cit., p. 294. PrLsEnrER, 1886, Bull. Mus. Hist. Nat. Belgique, IV, p. 104. 
Bourcuienat, 1888, ‘Iconogr. Malacol. Tanganika,’ PI. 1, figs. 18-15; 1890, Ann. 
Sc. Nat. Zool., (7) X, p. 15, Pl. 1, figs. 13-15. R. Srurany, 1894, in O. Baumann, 
‘Durch Massailand zur Nilquelle,’ p. 299. E. v. MARTENS, 1897, ‘Deutsch Ost Afr., 
1In 1873. (Malakoz. Blatter, XXI, p. 41) E. v. Martens defines the type locality more accurately as 
‘bei der Meschera des Gazellenfluss, Marz 1869.’’ This is Meshra-el-Req, in 8° 25’ N. and 29° 15’ E.., 
of recent maps. 
