MOUNT EOEAIMA IN BRITISH GUIANA. 59 



Mg. 7 represents the second leg of a female, long. 42 mm., dcA^oid of eggs. The merus 

 measures 5 m.m., the carpus 5J, the hand lly mm., of which the palm occupies 6 mm. 

 The palm is If mm. broad, the carpus at its distal extremity 1| mm. The toothing of 

 the fingers, figu.red fig. 7 a, appears in this young individual still very feeble, the 

 dactylus showing only three teeth, the index also, but those are less prominent, more 

 rounded. 



The second legs of these young individuals bear a close resemblance to Pal. potiuHu, 

 h\ Miill. {vide Ortmann, ' Os Camaroes da agua doce da America do Sul,' S. Paulo, 18i)7, 

 est. i. tig. D), but there can be no doubt that this species is a different one, for this 

 rescm1:)lance is only exhibited hij quite ijouiig individiiah. 



The second legs are on all their joints roughened by small thorny points, that arc 

 crowded and numerous on their outer margin, less numerous on the rest of their surface, 

 and those of the lower surface and of the inner margin are distinctly somewhat longer ; 

 these legs are glabrous, devoid of hair, except a rare short pubescence, only perceptible 

 under a lens. 



The ambulatory legs of the third pair project with a third of their pro^iodites beyond 

 the antennal scales, their carpopodites reaching as far forward as the peduncles of the 

 outer antenuu3 ; the legs of the fifth pair finally extend as far forward as the external 

 maxillipeds, but do not reach the free end of the antennal scales. The ambulatory legs 

 are rather slender. So are the meropodites of the third pair of tlic largest male 8 mm. 

 long, 1'25 mm. thick, the propodites l'\) mm. long and O'Si mm. thick, so that tlie 

 foi'mer are little more than six, the latter nine to ten times as long as broad ; for the 

 meropodites of the fifth legs (PL 6. fig. 8) these numbers are 7'5 mm. and 1 mm., for 

 the propodites 79 mm. and 0'7 mm., so that the meropodites are seven to eight, the 

 propodites eleven times as long as broad. The dactylopodites are short, measuring about 

 one-foui'th the length of the j)ropodites. The posterior margin of the propodites bears 

 two rows of spinules, so that in the third legs there are nine or ten spinules in the outer 

 and six or seven in the inner row. The ambulatory legs are a little hairy, but for the 

 rest quite smooth : the hairs are very short and fine, and arranged partly two and two in 

 longitudinal rows ; so that one row runs along the posterior margin of tlie meroj)oditcs. 

 The eggs are few hi number hut larye, having a diameter of 2^ mm. Concerning the 

 single female carrying these eggs, which is 38 mm. long from tip of rostrum to the 

 extremity of the telson, the following may be remarked : — The rostrum (tig. 2) reaches to 

 the middle of the terminal joint of the anteunulary peduncles ; the upper margin that 

 descends obliquely downward bears seven teeth, the second of which is placed above the 

 orbital margin ; the lower border is armed with two teeth, the interspaces are as usual 

 ciliated. Tlie external maxillipeds exceed the antennal jieduncle only by half their 

 leruinial joint. The tirst legs project only with the hands beyond the free end of the 

 antennal scales ; the hands measure just two-thirds the length of the carpus. The legs 

 of the third pair reach to the end of the antennal scales, those of the fifth to the end of 

 the antennal peditncles. The meropodites of the third pair are ij mm. long and f mm. 

 broad ; the propodites are 1< mm. long and ^ mm. broad. 



Falcctaoii, potiumi, P. Miiller, dilFers at tirst sight by the chelae of the second legs 



SECOND SKUIKS. — ZOOLOGY, VOL. VIII. 9 



