306 DE. J. Gr. DE MAI^ ON SPECIES OF PAL^MON 



the same size. Just in the middle between both teeth one sees the distal tooth of the 

 immobile finger, which is as large as that of the dactylus; posterior to it this finger carries 

 still two low teeth that are a little smaller. 



Palcemoii {Enpalcemon) simdaicus. Heller, from the Java Sea, is perhaps the most 

 closely allied form. One of the four female specimens which I described a few years 

 ago is lying before me {vide Zool. Jahrb., Syst. ix. 1897, p. 779, Taf. 37. fig. 71). 

 It is 75 mm. long, and its size is thus about the same as that of the macrobrachion 

 specimens from the Congo. The rostrum has about the same form and characters, but 

 it arises almost in the middle of the cephalothorax ; the distance of the first tooth from 

 the posterior margin of the cephalothorax is indeed tioice as great as its distance from 

 the anterior margin ; in P. macrobrachion, however, Jive to eight times as far, so that 

 in the African species this tooth is situated much nearer to the orbital margin. In 

 P. siindaieus the two spines on the sides of the cephalothorax are situated about in the 

 same horizontal line, but the hepatic spine of P. macrobrachion is situated much loioer. 

 The legs of the second pair much resemble each other in both species ; but the fingers 

 are smooth, not covered with the woolly pubescence characteristic of the West-African 

 form, and their toothing is different, the dactylus being armed with only two teeth, the 

 immobile finger with only one. The second legs are, moreover, otherwise coloured. The 

 other legs present also a great conformity in both species. According to Max Weber, 

 P. siindaieus inhabits the coast of Natal (Max Weber, Zool. Jahrb., Syst. x. 1897, 

 p. 165). 



Palcemon {Eupalcemon) macrobrachion, Herldots, inhabits the rivers of West Africa 

 from Liberia to Benguella. 



Palji:mon (Etjpal^mon) Foai, Coutiere. (Plate 19. figs. 30-37.) 

 Palamon (Eupalfemon) Foai, nov. sp., Coutiere, Bull. Museum d'Hist. nat. Paris, 1903, No. 7, p. 517. 



One single male, collected in the River Kribi, 25 mUes from the coast of Cameroon, 

 West Africa. This specimen belongs to the British Museum. 



This species, certainly different from. P. {Eupalcemon) macrobrachion, Herklots, is 

 apparently related to Palcemon paucidens, Hilgd., a species discovered at Adeli, near 

 Bismarckburg, Togo Country, described by Hilgendorf in Sitzungsber. Gesellschaft 

 Naturf. Preunde, Berlin, 1893, No. 5, p. 155. As Coutiere does not compare his species 

 with P. imucidens, it will be done in the course of this description. 



Our specimen is 8 cm. long from the tip of the rostrum to the end of the telson ; 

 Coutiere's largest specimen was 70"5 mm. long. The cephalothorax is smooth. The 

 rostrum is stout and projects straight forward exactly to the end of the antennal scales ; 

 it is armed above with six, below with two teeth. The rostrum arises on the anterior 

 half of the cephalothorax ; the distance of the first tooth from the anterior margin of the 

 cephalothorax is just one-fourth the whole length of the upper surface from the 

 posterior to the anterior margin. The upper margin is very slightly convex above the 

 eyes, but in P. paucidens the rostrum, which is armed above with 7-8, below with 

 1-2 teeth, and scarcely extends beyond the distal end of the antennulary peduncles, has 

 been described as high, foliaceous (" blattformig"), and short. Just as in the species 



