441 DH. J. G. DE MAN ON CllUSTACEA CHIEFLY 



oblique outer border, wbich is nearly siraigbt, tbougb curving a little at each extremity ; 

 anteriorly the nierus-joint is obtuse. On this joint the puncta are larger near the inner 

 border. Tlie finely punctate exognath reaches barely as far forward as the inner border 

 of the ischium, but in Fot. spinescens it extends almost to the middle of the merus. 



The finely, though rather densely, punctate terminal joint of the oval abdomen is 

 regularly rounded, its posterior border is just twice as broad as this joint is long ; the 

 penultimate joint is almost exactly as long as the terminal, the preceding grow 

 gradually shorter ; the punctuations ai'C very fine and rare. 



In both females the right cheliped is somewhat larger than the left. The upper 

 margin of the merus carries a subterminal spine, which is preceded by a smaller one, and 

 several sharp granules ; the lower margin carries also fovu* or five, subacute, spiniform 

 teeth and there are a few granules on the anterior border. The lower surface of the 

 merus is unarmed, jjresenting no tooth or spine near the carpal articulation. Just as 

 in Fot. {Parapotamon) spinescens and Fot. {Farathelphusa) lanzi, Dofl., the carpus is 

 armed internally with two unequal, pointed spines, of which the upper is the larger; its 

 upper surface is somewhat granulated, the granules being larger on the inner side. The 

 length of the larger chela is two-thirds of the greatest width of the carapace ; the palm 

 is a little longer than the fingers and a little longer than its height at the articulation of 

 the latter. The rounded upper border of the palm and its outer surface are beset with 

 snbacnte yranules, which are rather small and not very numerous ; the lower margin is 

 smooth, as also the inner surface. Characteristic is the immobile finger (PI. 33. fig. 63) 

 of the larger cheliped. This finger is somewhat curved at its base, the jirehensile 

 edge is here emarginate, whereas the lower border bulges somewhat out ; between the 

 emargination and the subacute tip of the finger it carries eight or nine small, obtuse, 

 somewhat unequal teeth. As the dactylus is nearly straight, tliere is proximally a small 

 interspace between the fingers ; the dactylus carries on the proximal half of its upper 

 border six or seven obtuse granules, and it presents longitudinal rows of puncta, one of 

 which runs on the middle of the upper border. The dactylus is provided with eleven or 

 twelve obtuse teeth, which diminish in size towards the tiji. The immobile finger is 

 punctate and marked with a longitudinal furrow on its outer surface. 



The fingers of the smaller chela are barely shorter than the palm, the immobile finger 

 is not emarginate at its base and scarcely bulges out ; each finger carries about a dozen 

 low, obtuse or subacute teeth, which diminish in size towards the tip ; the tips of the 

 fingers are pointed. 



The ambulatory legs are smooth, somewhat punctate. The upper margin of the 

 merus is slightly denticulate and ends in a sharp, though smaU, subterminal tooth ; 

 these teeth are, however, on the last pair and in the younger specimen less distinct. 

 The upper border of the following two joints is also finely denticulate internally ; the 

 lower border terminates, both at the outer and at the inner side, in a small sharp tooth 

 and one or two smaller teeth occur on the middle of that border. The spinulose 

 dactylopodites are, on all the legs, distinctly longer than the propodites. The ambu- 

 latory legs of the younger individual are a little pubescent on the upper border of 

 the joints. 



