118 , Bulletin American Museum of Natural History [Vol. LITI 
Planorbis sudanicus EK. v. Martens. See p. 121. 
Planorbis sudanicus tanganikanus Bourguignat. See p. 122. 
Planorbis sudanicus var. globosus GERMAIN, 1908, in A. Chevalier, ‘L’ Afrique 
Centrale Francaise,’ p. 505. Lake Chad. 
Planorbis sudanicus var. subsudanicus GERMAIN, 1908, in A. Chevalier, 
‘L’ Afrique Centrale Francaise,’ p. 505. Lake Chad. 
Planorbis tetragonostoma GERMAIN, 1904, Bull. Mus. Hist. Nat. Paris, p. 467; 
1908, in A. Chevalier, ‘L’ Afrique Centrale Frangaise,’ p. 506, Pl. v, figs. 10-11. 
Kuri Archipelago, Lake Chad. . 
Planorbis adowensis Bourguignat 
Text Figure 4 
Planorbis adowensis BoURGUIGNAT, 1879, ‘Descript. Moll. Egypte,’ p. 11 (type 
locality: Adua, Abyssinia); 1888, ‘Iconogr. Malacol. Tanganika,’ Pl. 1, figs. 1-4; 
1883, Ann. Se. Nat. Zool., (6) XV, p. 101; 1890, op. cit., (7) X, p. 17, Pl. 1, figs. 1-4. 
E. v. Martens, 1897, ‘Deutsch Ost Afr., IV, Beschalte Weichth.,’ p. 147. E. A. 
SmiruH, 1904, Proc. Malacol. Soc. London, VI, 2, p. 98. ANncry, 1907, Bull. Scientif. 
France et Belgique, (5) IX, (1906), p. 249. 
“O b C 
Fig. 4. Planorbis adowensis Bourguignat. x 1}4. 
Planorbis adowensis var. minor GERMAIN, 1904, Bull. Mus. Hist. Nat. Paris, 
p. 351 (type locality: Kibanga, Lake Tanganyika). 
Planorbis (Coretus) adowensis Bourguignat. DAUTZENBERG AND GERMAIN, 
1914, Rev. Zool. Afric., IV, 1, p. 42. 
Planorbis (Planorbis) adowensis Bourguignat. GERMAIN, 1921, Rec. Indian Mus., 
X XI, p. 24. 
Undussuma (Stuhlmann Coll.). Lubumbashi River near Elisabethville; Lukete 
(between Kiambi and Sampwe); Lake Moero at Lukonzolwa (J. Bequaert Coll.). 
Lake Tanganyika: Kibanga; on the western coast between Ubuari Peninsula 
and the outlet of the Lukuga. ; | 
Beni (Borgerhoff Coll.). Penge; Irumu (J. Bequaert Coll.). 
Lubumbashi River near Elisabethville (Michael Bequaert Coll.). 
This species has more rapidly increasing whorls than P. sudanicus 
tanganikanus, the spiral of the left side being narrower, the last whorl 
relatively wider. On the right side sudanicus tanganikanus shows one 
whorl more than large adowensis. The left side of adowensis generally 
shows minute spirals decussating the fine striz as in P. sudanicus tan- 
ganikanus. 
