1926] Schmitt, Crustaceans Collected by the Congo Expedition a 
teeth, almost invariably there is but one on the carapace; one specimen 
only had 2 teeth behind the orbital border; this specimen had 10 above 
and 3 beneath. As described and figured by Thallwitz and Balss, a 
considerable portion of the distal part of the rostrum is devoid of teeth 
above and below; usually that portion before the antennular peduncle, 
except for one tooth close behind the tip, which gives it a bifid appear- 
ance. One specimen from Liberia had the rostrum ending simply. 
Usually the last ventral tooth is a little in advance of the penultimate 
dorsal tooth, but sometimes 2, as in Thallwitz’s figure. 
According to Thallwitz the shorter ramus of the outer antennular 
flagellum is fused with the longer for more than half its length; he distin- 
guished 8 free and 12 to 18 coalesced articles in the shorter ramus, which 
count may vary up to 11 united and 14 free segments. Balss figures 12 
fused segments. | 
The fingers of the second pair of legs are about two-thirds the length 
of the palm, the hand about two-thirds of the carpus, sometimes a little 
less, and the hand and merus are about subequal; the merus may be a 
very little longer than the hand. One-third to one-half the carpus of the 
second legs extends beyond the tip of the antennal scale. In the fifth 
pair of legs the dactyl does not appear quite as long as one-half the 
propodus as given in the original description; as in the two preceding 
pairs, it is rather more nearly one-third the length of the propodus. 
Thallwitz’s statement that the second legs exceed the antennal scale by 
the length of the fingers is surely an error. The sixth abdominal segment 
and the telson are about equal in length. The mandibular palp is three- 
jointed. ) 
These specimens are identical with those Miss Rathbun had from 
Liberia, and no doubt also with those briefly characterized by Lenz 
(loe. Citas 
MaAcROBRACHIUM Bate 
Macrobrachium Bate, 1868, Proc. Zodél. Soc. London, p. 363. 
Macrobrachium macrobrachion (Herklots) 
Palemon macrobrachion HeRKiotTs, 1851, ‘Addit. Faun. Carcin. Afr. Occ.,’p. 15. 
Palemon acanthurus AuRIVILLIUS, 1898, Bihang K. Sv. Vet.-Akad. Handl., 
Stockholm, XXIV, Afd. IV, No. 1, p. 19. 
Bithynis acanthurus Ratupun, 1900, Proc. U. 8. Nat. Mus., XXII, p. 315, part, 
specimens from West Africa. 
Palemon (Eupalemon) macrobrachion DE Man, 1912, Ann. Soc. Roy. Zool. Mala- 
col. Belgique, XLVI, (1911), p. 203, Pl. 1, fig. 1, Pl. rv, fig. la, andsynonymy. Bass, 
1914, ‘Ergeb. Zweiten Deutschen Zentral-Afrika Exped. 1910-1911,’ I, Zool., p. 98. 
