NODULARIA 1021 
laterals curved; anterior scars well marked; nacre bluish 
whitish or reddish. 
Length 55, height 32, diam. 1g mm. 
Length 52, height 30, diam. 21 mm. 
, 
Nile system; Senegal and Upper Cazamance (Vignon). 
Unio nilotica CaILLiAup, Voy a Méroé, II, 1826, pl. Lx1, figs. 
8, 9.—Han.ey, Biv. Shells, 1843, p. 197, pl. xx1, fig. 39. 
Margarita (Unio) niloticus Lia, Syn., 1836, p. 29; 1838, p. 21. 
Margaron (Umo) niloticus Lea, Syn., 1852, p. 31; 1870, p. 50. 
Nodularia niiotica StMpson, Syn., 1900, p. 821.—PALLARY, 
Mem. Inst. Egypt, VI, 1909, p. 77, pl. 1v, figs. 1, 2. 
Unio pumilus ZEIGLER, manuscript and of authors. 
Unio parreysst Puriiprt, Conch., III, 1848, p. 81, pl. v, fig. 6. 
Nodularia (Celatura) parreysst PatiAry, Mem. Inst. Egypt, 
V1, 1909; p: 78, pl. v, fig:'6. 
Umio rugifer Kuster, Conch. Cab. Unio, 1856, p. 157, pl. XLv, 
figs. 3, 4. 
Unio sennaariensis Kuster, Conch. Cab. Unio, 1862, p. 280, 
pl. xciv, figs. 5, 6. 
Unio eneus Jickri1, Faun. Moll. N. O. Af., 1874, p. 274, pl. 
1%, fis. 2. 
This seems to differ from N. egyptiaca with a fair degree 
of constancy, in being solider, more elongated, more inequi- 
lateral, and in having shorter, more solid, ragged pseudocardi- 
nals. Many specimens entirely lack rays. 
Var. prunert “Bourguignat” Pallary. 
“Differs from the type (parreysst), by its smaller size, more 
elongated, less elevated shape, !ess thickness, more angulated 
posterior margin. In this species the anterior and posterior 
margins are fan-shaped.” (Pallary). 
Type locality, The Nile between the two cataracts. 
Unio egypticus Jickett, Fauna N. Ost. Afrik. 1874, pl. x, 
fie) 7. 
Nedularia (Celatura) parreyssi var. prunert “BOURGUIGNAT” 
PaiLtAry, Mem. Inst. Egypt, VI, 1909, p. 78. 
