IOI 



of the palm, but is scarcely visible in the gap between the fingers; at the outer surface of 

 the chela a white line, no ridge, runs along from the carpal joint to the tip of the fixed 

 finger; fingers conical, not compressed, somewhat gaping at the base, tips slightly spooned, 

 cutting margins fïnely and irregularly toothed; movable finger much curved, fixed fi 

 straight. The outer surface of the arm, the upper si de of the wrist and the 

 w hole chela are c o v e r e d w i t h a fine reticulated sculpture, resembling a 

 multitude of m i n u t e s c a 1 e s (fig. i l> and e). 



The walking legs much resemble those of Pseudograpsus albus : the meropodites are likewise 

 slender, cylindrical, unarmed at the anterior margin, but provided with a few hairs at the base; 

 for the rest the legs are co m pi e tel y hairless, even at the propodites and the dactyli; 

 the latter are falciform, longitudinally grooved and with horny tips, they are as long as the 

 preceding propodites, even in the case of the posterior legs, whereas they are considerably 

 shorter in Ps. allnis. 



This species is certainly nearest to Ps. erythraeus, which also presents a woolly fur at 

 the inner surface of the chela, but the lateral teeth of the carapace are distinctly separated by 

 hssures, which are entirely absent in Ps. laniger \ the front of Kossmann's species is deflexed, 

 and the anterior margin does not project; of the external maxillipeds the merus is less distinctly 

 auriculate, the ischium more rapidly narrows towards the base and is proportionally broader 

 than the narrow exognath. 



Heterograpsus clongatus A Milne-Edwards ! ), a cotype of which, received from the author 

 himself in 1878, is in the. Leiden Museum, at once reveals the very great resemblance between 

 this and the present species. The general shape of the carapace, the antero-lateral teeth and 

 the prominent front are entirely the same; besides, the dimensions of the carapace of Pseudo- 

 grapsus laniger completely correspond with those of Hemigrapsas clongatus measurecl by 

 Miss Rathbun 3 ). Unfortunately the New-Caledonian specimen of Milne-Edwards is very much 

 damaged, none of the legs being entire, nearly all of them detached, and the chelae completely 

 wanting. Nevertheless, what is left of the right cheliped presents the same squamiform, mean- 

 drian sculpture as in the new species : the inner and upper border of the meropodite is likewise 

 fringed with long hairs, and even the tuft of hairs at the inner angle of the carpopodite is 

 present in the same way. The maxillipeds again are exactly alike, and I should not hesitate 

 to declare the two specimens absolutely identical, were it not for some slight differences: 1" the 

 general colour of Heterograpsus clongatus is a chestnut-brown, with numerous rounded patches 

 of a somewhat lighter colour on the carapace; that of Pseudograpsus laniger is entirely 

 ivory-white; 2" the suborbital ridge is distinctly and roughly granular in the former, but only 

 microscopically striate in the latter species; and 3 the walking legs are fringed with rather 

 long hairs along the margins in the species of Milne-Edwards, but entirely hairless in the 

 new species (save for some few bearded hairs quite near the base, and along the proximal part 

 of the anterior border, of the meropodite). 



In concluding I a m cl i s p o s e d toconsider Heterograpsus clongatus and Pseudo- 



1) Nouv. Avch. Mus. Paris, t. 9, 1873, p. 317, pi. 17. f. 5. 



2) See note 4 p. 07. 



IOI 



