1927] Pilsbry-Bequaert, The Aquatic Mollusks of the Belgian Congo 255 
-_oides in the wide sense. We do not care to add new name combinations 
for a host of merely mutational forms, and a consideration of the synonymy 
of Nyasan species does not come within the limits of this work. They are 
here listed separately, therefore, under the original names. 
List of Melanoides of Lake Nyasa 
Nyassella acuminata BouRGUIGNAT, 1889, Bull. Soe. whinge aise: France, VI, p. 22, 
Pl. 1, figs. 21-22. 
Nuwesier acutalis BOURGUIGNAT, 1889, Bull. Soc. Malacol. France, VI, p. 10= 
Melania polymorpha E. A. Smiru, 1877, Proc. Zool. Soc. London, Pl. uxxv, fig. 10 
(only). 
Melania Ci, arcuatula E. v. Martens, 1897, ‘Deutsch Ost Afr., IV, 
Beschalte Weichth.,’ p. 201, Pl. v1, fig. 39. 
Nyassella arenaria Bouraurenat, 1889, Bull. Soc. Malacol. France, VI, p. 20, 
Pl. 11, figs. 17-18. 
Nyassia callista BouRGUIGNAT, 1889, Bull. Soc. Malacol. France, VI, p. 12, 
Pl. 11, figs. 1-2. : 
Nyassia edgart BoURGUIGNAT, 1889, Bull. Soc. Malacol. France, VI, p. 13= 
Melania nyassana E. A. Smiru, 1877, Proc. Zool. Soc. London, Pl. txxv, fig. 2 (only). 
Micronyassia egregia BoURGUIGNAT, 1889, Bull. Soc. Malacol. France, VI, p.27= 
Melania turritispira E. A. Smiru, 1877, Proc. Zool. Soc. London, Pl. uxxv, fig. 15 
(only). 
Nyassia elegans BOURGUIGNAT, 1889, Bull. Soc. Malacol. France, VI, p. 15, Pl. 11, 
figs. 7-8. 
Nyassella episema BourGuIGNAT, 1889, Bull. Soc. Malacol. France, VI, p. 22, 
Pl. 1, figs. 19-20. 
Micronyassia eximia BouRGuIGNAT, 1889, Bull. Soc. Malacol. France, VI, p. 27, ° 
Pl. 1, figs. 1-2. 
Nyassella formosa BouRGUIGNAT, 1889, Bull. Soc. ‘Malacol. France, VI, p. 21, 
Pl. 1, figs. 23-24. 
Ngaent giraudt BOURGUIGNAT, 1889, Pull. Soc. Malacol. France, VI, p. 15, Pl. 11, 
figs. 9-10. 
Micronyassia giraudt BoURGUIGNAT, 1889, Bull. Soc. Malacol. France, VI, p. 
28, PI. 1, figs. 5-6. 
Nyassia hermosa BourGuIGNAT, 1889, Bull. Soc. Malacol. France, VI, p. 8= 
Melania polymorpha E. A. Smrru, 1877, Proc. Zool. Soc. London, Pl. uxxv, fig. 5 
(only). 
Nyassia idia BourcuIeNnat, 1889, Bull. Soc. Malacol. France, VI, p.,16, Pl. 11, 
figs. 11-12. 
Nyassia lacunosa Boureutenat, 1889, Bull. Soc. Malacol. France, VI, p. 9= 
Melania polymorpha E. A. Smiru, 1877, Proc. Zool. Soc. London, Pl. txxv, fig. 7 
(only). 
Nyassia lacustris BourcuIGNaT, 1889, Bull. Soc. Malacol. France, VI, p. 11= 
Melania polymorpha E. A. SmrtH, 1877, Proc. Zool. Soc. London, Pl. uxxv, fig. 9 
(only). 
Nyassomelania levigata BourcuIGNAT, 1889, Bull. Soc. Malacol. France, VI, p. 
32, Pl. 1, figs. 13-14. 
