FEOM THE INDO-PACIFIC AND WEST AFRICA. 317 



other characters agrees with the preceding, the right leg is lost, but the left (fig. 63) differs 

 from them by the palm being considerably shorter than the fingers and by the fingers being 

 much more curved aiid leaving a wide interspace beticeen them, filled tip loith hairs. This 

 leg is the shorter one, because the still present coxopodite of the other leg is much larger ; 

 and in this case it is no doubt that leg which in de Saussure's figure of Palcemon Faust imts 

 is seen on the right side (de Saussure, ' Memoires pour servir a I'Histoire Naturelle du 

 Mexique, etc' 1^ livr. Crustaces, 1858, pi. iv. fig. 30). Each finger bears a cutting-edge 

 with a tootli at the end of it ; and between this tooth and the articulation the dactylus is 

 armed with two somewhat smaller teeth, the immobile finger with four that are still 

 smaller than those of the dactylus (fig. 64?). 



This phenomenon, that the fingers of the smaller leg gape in some individuals, the inter- 

 space being then filled up loith hair, but closed together in others, has already been described 

 for other species, e. g. for Palcemon [Eupalcemon) endehensis, de M., which occurs in 

 fresh water of the island of Flores (de Man, ' Decapoden des Indischen Archipels,' 1892, 

 p. 465, Taf. xxvii. fig. 42). 



The rostrum of the male (No. 8) that is 34 mm. long is a little (O'Tomm.) longer than 

 the scaphocerites, and agrees with the other specimens. The outer footjaws project for 

 lialf their terminal joint beyond the distal end of the lower peduncles, and the legs of the 

 first pair extend beyond the scaphocerites by tlie length of their fingers. The left leg 

 (fig. 65) of the second pair projects with the whole hand, the right leg with the fingers, 

 beyond the distal end of the antennal scales. The inner margin of the palm of the larger 

 leg is armed with ten large spines that are 0-16 mm. long, «. e. one-seventh of the breadth 

 of the palm; five or six spines occur along the inner margin of the immobile finger. 

 Each finger bears a sharp cutting-edge that extends along two-thirds of the dactylus 

 and almost along three-fourths of the immobile finger ; at the end of each cutting-edge 

 stands a small obtuse tooth. Between tiiis tooth and the articulation (fig. 66) there are 

 on each finger still four other teeth of about the same size. The fingers of the other leg 

 agree witli them, but they are armed with only three low teeth l)etwoeu the tooth at the 

 end of the cutting-edge and the articulation. 



In the youngest male (No. 9) that has been measured, which is 27 mm. long, the 

 rostrum is still a little longer than the dorsal surface of the cephalothorax, and projects 

 1| mm. beyond the distal end of the scaphocerites. The slightly convex basal part reaches 

 to the end of the antennulary peduncles, and the apical i)art is slightly turned upward ; 

 there are three teeth on the cephalothorax, the fourth standing immediately before the 

 orbital margin. The legs of the fiist pair reach to the end of the antennal scales. The 

 second legs are equal and i^roject for almost their whole hand beyond the scaphocerites. 

 The carpus is just a little longer than the merus and shorter than the hand. The tooth 

 at the end of the cutting-edge stands on the dactylus at about one-third of its length from 

 the articulation, and there are three similar teeth between the latter and that tooth ; on 

 the immobile finger the cutting-edge reaches a little farther, and here also three low teeth 

 are found posterior to it. 



In the largest female (No. 10), which is 41 mm. long, the apical part of the rostrum 

 (fig. 67) is rather much turned upward and reaches slightly beyond the antennal scales ; 



45* 



