'274: Annals of the South African Museum. 



GENUS UNIO, Ketz, 1788. 

 (Dissert. Nov. Test. Genera, Lund. p. 16.) 



Type of Genus, U. pictorum (Lin.). 



The four species which follow are left in Unio, to which they 

 were originally attributed, pending further investigation. I have 

 Dr. Haas' authority for stating that they do not really helong to 

 that Genus, but that it is doubtful whether either of them can be 

 placed in Gafferia. 



579. UNIO FISSIDENS, Bottger. [S.A.M.] 



1886 Unio (Hyridella) fissidens, Bttg., Ber. Senckenb. Naturf. Ges. 



Frankfurt, p. 27. pi. 2, f . 6, 7. D.F. 

 1910 Bttg., Abh. Senckenb. Naturf. Ges. 



Frankfurt, xxxii. p. 453. N. 

 Type in Senckenburg Mus. Frankfurt. 



Hab. BRITISH BECHUANALAND. Nosob-Hygap watercourse, east 

 of Kebeum (subfossil, Nolte). Witkop (subfossil, Schultze ; Eogers). 



380. UNIO HYGAPANUS, Bottger. 



1886 Unio (Hyridella) kygapanus, Bttg., Ber. Senckenb. Naturf. 



Ges. Frankfurt, p. 26. pi. 2, f. o. D.F. 



Type in Senckenberg Mus. Frankfurt. 



Hab. BRITISH BECHUANALAND. Nosob-Hygap watercourse, east 

 of Kebeum (subfossil, Nolte). 



Described from a single left valve ; possibly only a less highly 

 sculptured form of fissidens . 



581. UNIO KUNENENSIS, Mousson. 



1887 Unio kunenensis, Mouss., J. de C. xxxv. p. 300. pi. 12, f. 10. D.F. 

 1891 Smith, A.M.N.H. viii. p. 319. N. 



1904 ,, von Mts., Die Kalahari, p. 758. 7V. 

 Type in Zurich Museum. 



Hab. OVAMPOLAND. Kunene Eiver (Schinz). 



BECHUANALAND. Okavango and Botletle District, and in the salt 

 pans of the Makarrikarri brook (fossil, Passarge). 



" Nearly allied to U. hauttecoeitri, Bgt., and other species from 

 the East African Lakes " (von Martens). 



582. UNIO ZAMBESIENSIS, Preston. 



1905 Unio sara&esHWSw,Prest.,Proc.Mal.Soc.vi.pp.300,f.l;301. D.F. 

 Type in British Museum. 



Hab. EHODESIA. Victoria Falls (Morrell). 



