824 PEOCEEDINGS OF THE NATIONAL MUSEUM. vol xxii. 



NODULARIA LIEDERI von Martens. 



* Unio Uederi vox Martens, Besch. Deuts. Ost-Af., 1897, p. 226, pi. vii, fig. 19. 

 Lake Nyassa, 



NODULARIA CALATHUS Bourgnignat.' 



* Unio ealatluis BourGjS'IGNat, Esp. Ouk. et Tan., 1885, p. 23. 

 Taugauyika. 



NODULARIA BAKOYI Rochebrune. 

 ""Unio lakoyt Rochebrunk, Bull. Soc. Phil., 7th ser., VI, 1882, p. 33. 



Bakoy, High Senegal. 



NODULARIA RADIOTA Charmes. 

 ''Unio radiotus Charmes, Bull. Soc. Mai. Fr., II, 1885, p. 166. 

 Central Africa. 



NODULARIA JULIANI Rang. 



" Unio juliani Rang, Nouv. Ann. Mus., 1835, p. 309. 



Senegal. 



(Group of Nodularia Tctmenensis.) 



Shell elliptical, subinflated, solid, narrowly biangulate behind, the 

 point of the shell being about midway up the height, the post-base 

 iniJated, beaks full, eroded iu the specimen figured but no doubt zigzag 

 sculptured; whole surface of the shell covered with wavy corrugations; 

 epidermis brownish; one rather solid, deeply incised pseudocardinal in 

 the right valve, two in the left; nacre yellowish white; muscle scars 

 deep. Animal unknown. 



NODULARIA KUNENENSIS Mousson. 



* Unio hunenensis MoussoN, Jl. de Conch., XXXV, 1887, p. 300, pi, x.i, fig. 10.— 



*Smith, Ann. aud Mag., VIII, 1891, p. 319. 



Head of Kunene Eiver, Is'orth Ovampo, Southwest Africa. 



Section CAFFERIA Simpson, 1900. 

 (Type, Unio caffer Krauss.) 



Shell elongated or elliptical, rhomboid and solid when old; beaks full, 

 the sculpture corrugated zigzag, the ridges often extending over the 

 disk; epidermis yellowish-brown to nearly black, dull colored, some- 

 what sulcate; teeth rather strong, muscle scars deep, well defined. 



(Group of Nodularia caffer. Characters as in the section.) 



iThis and the following species are unfigured, and are referred by von Martens 

 aud others to this group. I know nothing of them. I am a little in doubt as to 

 the affinities of some of the above-figured species which I have not seen, but they 

 are placed here on the excellent authority of von Martens. 



