Land- & Fresh-water Mollusca. 15 



niloticus [71], Sommerville [126]; the main species and var. nil- 

 oticus). The Upper Nile (Klot-Bey ace. to v. Martens [71], 

 Mettenheimer ace. to Jickeli [54]). Harasa (between Atbara 

 and Bahr Salam) (Piroth ace. to Jickeli [55] ; the main species). 

 Sobat-riwer (Werne ace. to v. Martens [71]). Nuer Land: Bacher 

 Seraf (Marno ace. to Jickeli [54]). Central Africa (Baker ace. 

 to Adams [1]). 



Literature: 



a) The main species: 1) Unio acgyptiacus Ferussac 117 (pi. 7, f. 3, 4, 5), 

 16 (pi. 61, f. 6, 7, Texte IV, p. 263), 22 (II, p. 587), 23 (VI, p. 553), 60 (p. 157, 

 pi. 45, f. 2), 71 (p. 11), 28 (p. 117), 1 (p. 376), 93 (p. 39), 111 (XVI, spec. 132), 

 126 (p. 382), 50 (p. 91), 54 (p. 271, T. X, f. 1 — 9), 55 (p. 339). 2) Unio aegyp- 

 tidcus Caillaud 1 (p. 376). 3) Unio sp. 2 (p. 40). 4) Unio inflata Jan. 49 a (p. 8); 

 &) var. niloticus (Ferussac): 1) Unio niloticus Ferussac 16 (II, ,pl. 61, f. 8 — 9, 

 Texte IV, p. 263), 117 (pi. 7, f. 6), 22 (II, p. 585), 23 (IV, p. 552), 71 (p. 13), 

 93 (p. 40), 111 (XVI, spec. 374), 126 (p. 382). 2) Unio acgyptiacus var niloticus 

 (Ferussac) 54 (p. 272). 3) Unio rugifer Kuster 60 (p. 157, pi. 45, f. 3, 4), 71 

 (p. 13), 93 (p. 39). 4) Unio pictorum var. Forskal 39 (p. 123). 5) Unio pumilus 

 Zgl. 54 (p. 272). 6) Unio inflata 54 (p. 272). 



17. Unio parreyssi v. d. Busch. 



Long. 31 mm. Lat. 19,5 mm. Crass. 13,5 mm. 

 Hah. The White Nile. One living specimen. 



Geographical distribution: 

 The White Nile, Senaar (Kotschy ace. to Philippi [107]). 

 Bahr-el-Ghazal (Schweinfurth ace. to v. Martens [80]). 

 Literature: » 



1) Unio parreyssi v. d. Busch 107 (Band 3, p. 81, pi. 5, f. 6), 60 (p. 268, 

 pi. 90, f. 6), 71 (p. 13), 80 (p. 43), 54 (p. 273). 2) Unio sennaariensis Kuster 

 60 (p. 280, pi. 94, f. 5, 6), 73 (p. 19), 93 (p. 40). 



18. Spatha caillaudi v. Martens. 



Ijong. 135 mm. Lat. 85 mm. Crass. 51 mm. 



Hab. 1) Between ed Dueim and Goz Abu-Gomr (the White 

 Nile). 5 specimens without animals; 2) Goz Abu-Gomr (the White 

 Nile); 3) Kaka (the White Nile). 2 specimens with animals. 

 Geographical distribution: 



Loiver Egypt (Caillaud [16], Jickeli [50]). The White Nile 

 (Schweinfurth ace. to v. Martens [80]). Harasa, (between At- 



