262 THE WEST-AFRICAN 
5. Pal. (EHupalaemon) dua Lenz 1910. 
General distribution: Avakubi upon Ituri (Lenz) ; Rio © 
Benito (Lenz). 
6. Pal. (Eupalaemon) Lenzii de Man 1911. 
General distribution: river Congo, probably near Boma 
(de Man). 
KEY TO THE SPECIES OF THE SUBGENUS Hupalaemon Ortm. 
a, Two or three of the upper rostral teeth are situated 
on the carapace, behind the orbital margin. Spinules 
on the inner border of the carpus and of the palm of 
the 2d legs much larger than those on the outer 
border, often arranged in two more or less distinct, 
parallel rows. Anterior pair of spinules situated be- 
fore the middle of the telson, very rarely just in the 
middle, 
b, Fingers of the 20d legs covered with a woolly felt. 
Carpus of the 20d legs distinctly longer than the 
palm. ~ macrobrachion Herklots. 
(J. A. Herklots, Additamenta ad Faunam 
Carcinologicam Africae Occidentalis, L. B. 
1851, p. 15). 
b, Fingers of the 2nd legs not covered with a woolly 
felt. Carpus of the 2nd legs appearing at first sight 
almost of the same length as the palm, being but 
a trifle longer, sometimes even a trifle shorter than 
the palm. Lenzti de Man. 
(J. G. de Man, Notes from the Leyden 
Museum, Vol, XXXIII, 1911, p. 225 !). 
a, Only one tooth is situated on the carapace, behind 
the orbital margin. 


1) At page 225 of this paper the words „kein Zahn” instead of „ein Zahn” 
in Lenz’s description of Palaemon dux have been indicated, to my great 
regret, too emphatically as „a rather confusing inaccuracy”. The quite accu- 
rate figure 2, in connection with the preceding words „Der Augenstiel ent- 
springt genau unterhalb des 2. Rostralzahnes”, proves indeed at once that 
in Pal. dur one tooth is situated on the carapace and that the words „kein 
Zahn” are merely a lapsus calami. 
Notes from the Leyden Museum, Vol. X XXIII. 
