1926] Schmitt, Crustaceans Collected by the Congo Expedition 30 
and carpi of the second legs becoming longer in relation to the palm the less 
mature the male, or in the females as compared with the mature males. 
In the proportions of these legs the immature males and females stand 
together, and apart from the mature males, just as they do in M. duz. 
De Man is correct in saying that the merus is always longer than the 
ischium if the statement is restricted to the mature males, in which it 
exceeds the ischium “by a third or fourth.’’ In our smallest measured 
male of 48.5 mm. long these joiuts are of equal length, and but little 
different in the females. It does not appear, in our specimens at least, 
that the carpus is shorter than the palm in the adult males. Maybe 
de Man measured his palmar length, and that of the fingers as well from 
the base of the sinus between the latter; this would give a slightly longer 
palm than the measurements presented in the accompanying table 
above. As one goes from mature to immature, the carpus becomes rela- 
tively longer as compared to the hand; the females resemble the imma- 
ture males. The fingers vary from a little less than, or about half the 
length of the palm in larger specimens, to more than half, or, as in the 
second right leg of the smallest measured female, as much as two-thirds 
the length. Otherwise the proportions of the second legs are much in 
agreement with de Man’s detailed description; likewise also the relative 
length of the third and fifth legs. In our largest specimens of about the 
size of de Man’s No. 8 (loc. cit., table, p. 218) the third legs exceed the 
antennal scale by just a little more than the dactyls, in our younger 
specimens and females, as in his young males, by only a part of the 
fingers. ; 
The ovoid eggs are rather large for the females (about 58 to 67 mm. 
long) carrying them, measuring from 3.35 to 3.40 mm. long by about 
2.17 mm. for the shorter diameter. 
Macrobrachium dux (Lenz) 
Plates IV, Figure 2; V; VI, Figure 1 
Palezmon (Eupalemon) dux Lenz, 1910, ‘Wissen. Ergebn. Deutschen Zentral- 
Afrika Exped. 1907-1908,’ III, Zool. I, p. 129, Pl. 1, figs. 2-5; 1911, Sitzb. Gesell. 
Naturf. Freunde Berlin, p. 313. Dr Man, 1912, Ann. Soc. Roy. Zool. Malacol. 
Belgique, XLVI, (1911), p. 222, PI. rv, figs. 5, 5a, 5b, and synonymy. 
Palzmon (Eupalxmon) dux var. congoensis bE Man, 1912, Rev. Zool. Africaine, 
I, p. 416; 1912, Ann. Soc. Roy. Zool. Malacol. Belgique, XLVI, (1911), p. 229, PI. 
Iv, figs. 6, 6a. 
Palemon (Eupalemon) lenzii pz Man, 1911, Notes Leyden Mus., XXXTII, 
p. 255; 1912, Ann. Soc. Roy. Zool. Malacol. Belgique, XLVI, (1911), p. 222, Pl. um, 
figs. 4, 4a, 4b, Pl. 111, figs. 4c, 4d, 4e. 
