1926] Schmitt, Crustaceans Collected by the Congo Expedition 29 
distally), merus 14.75 (2.66 wide distally) long; right leg, movable finger 
11, palm 18.25 (2.5 wide at middle), carpus 20.1 (2.5 wide distally), 
merus 14.5 (2.5 wide distally) long. 
The rostral count of these specimens is as follows (in each there 
were two teeth on the carapace proper): co 79 mm. long +; 29 46 mm. 
long +; & 44mm. long**; 9 38 mm. long =>. 
Macrobrachium foai (Coutiére) 
Plate I, Figure 1 
Palemon (Eupalemon) foat CoutTimrReE, 1902, Bull. Mus. Hist. Nat., Paris, VIII, 
p. 517; 1908, ‘Résult. Scient. Afrique,’ Paris (Impr. Nationale), p. 574, figs. 1-4. 
Dre Man, 1912, Ann. Soc. Roy. Zool. Malacol., Belgique, XLVI, (1911), pp. 198, 200, 
205, 206, 214, 217. . 
This species is known only from the Upper Congo, Coutiére’s specimens having 
but the designation ‘‘Haut-Congo”’ for the type locality. 
Stanleyville, April 1915, 607, 6 (5 ovig.). 
The straight rostrum, the slender second legs, and the minute, 
scarcely discernible dorsal spines placed far back on the telson distin- 
guish this species from all related Congo Palemonide. ‘The specimens 
before us were associated with those of M. lujx listed below, from the 
same locality, but they are readily sorted out from the young of that 
species by means of any one of those three characters. 
The rostrum is as long as the antennal scale and often slightly longer; 
in one specimen only it was no longer than the spine of the scale; almost 
invariably the tips of the dorsal teeth are in an approximately straight 
line beginning with the second tooth and ending with the rostral 
extremity; the dorsal teeth are quite evenly spaced, often right up to the 
tip; the second is usually a little farther from the first than the rest from 
each other, and, too, the distance from the last one to the tip is often 
reduced so that it might well be considered subapical. The rostral 
count of the twelve Stanleyville specimens gives us arange of *3=>; eleven 
being the usual number of dorsal teeth; two teeth are quite regularly on 
the carapace, but one of the twelve specimens had one tooth on the 
carapace. 
- The third legs exceed the antennal scale by the length of the dactyl 
in the largest specimen; the fifth legs are almost as long. Even under 
low magnification, the spines on the telson look more like puncte than 
otherwise; in the largest specimen, an ovigerous female, the anterior 
pair is at about the beginning of the distal third of the telson; the 
spines of either pair are about twice as far apart transversely as the two 
pairs are from each other in a longitudinal direction. 
