1020 NODULARIA 
Margaron (Unio) egyptiacus Lea, Syn., 1852, p. 32; 1870, p. 
50. 
Unio egyptiacus Hanury, Biv. Shells, 1843, p. 198, pl. xx, 
fig. 56.—Kustrer, Conch. Cab., 1856, p. 157, pl. xLv, fig. 2.— 
REEVE, Conch. Icon., XVI, 1865, pl. xxv1, fig. 132.—JICKELI, 
(part), Fauri. Moll. N. O. Af., 1874, p. 271, pl. x, figs. 1-6, 8. 
—Kone.t, Icon., new ed., 1886, p. 25, pl. xLiv, figs. 262-265. 
Nodularia egyptiaca SIMPSON, Syn., 1900, p. 821.—PALLARY, 
Mem. Inst. Egypt, VI, 1900, p. 78, fig. 8. 
Unio eucyphus Bourcuicnat, Rev. et Mag., LX, 1857, p. 19, 
pl. 11, figs. I1-3.—Kose.t, Icon., new ed., XVIII, 1912, p. 
55, pl DVIL hg: 2672: 
Unio bourguignati LANDRAN, Seance Soc. Sci. Nat. Seine, 
1864, p. 5) pl. ties, -1-= 
Pharaonia bourguignati RocuEBRUNE, Bull. Soc. Mal. Fr., II, 
1886, p. 113. 
Nodularia gaillardott “BourcuicNar’ PaLLary, Mem. Inst. 
Egypt, VI, rgo9, p. 78, pl. v, figs. 7, 8. 
Higher in proportion to length, thinner, more distinctly 
rayed and having less solid teeth than N. nilotica, with which 
~ it has been confounded. ‘The beak sculpture is sometimes al- 
most wholly nodulous, at other times it consists of zigzag, sub- 
nodulous ridges. 
NopubaARtIA NILOTICA (Cailliaud). 
Shell long elliptical or somewhat obovate, subinflated, sub- 
solid, inequilateral ; beaks moderately raised, sculptured with 
‘broken, subnodulous, zigzag ridges ; posterior ridge full, round- 
ed, ending in a blunt point at or below the median line; hinge 
line lightly curved; anterior end a little narrowed, rounded, 
sometimes subangulate above; base line curved, fuller behind 
the middle; dorsal slope obliquely truncate ; surface with irreg- 
ular, subsulcate growth lines, often with slight, swbradial 
ridges behind ; epidermis often wrinkled, greenish, often band- 
ed and very faintly rayed, with a reddish tint on the umbonal 
‘region, subshining; pseudocardinals subcompressed, ragged ; 
