42 CRUSTACEA FROM PORT CURTIS DISTRICT, QUEENSLAND, 



From the description given by Henderson it differs in having 

 the ambulatory dactyli biunguiculate only, and in having a very 

 prominent lobe on the distal inner margin of the merus of the 

 cheliped, characters which he assigns to P. biunguiculatus. 

 The median frontal lobe, however, is subacute, and is not much 

 produced beyond the laterals, and the carpus is very short and 

 broad. The larger cheliped is lost, but the smaller agrees 

 perfectly, excepting the above-mentioned character, with those of 

 Henderson. 



Under the name P. biunguiculatus Dana,* a specimen has 

 been recorded by Haswell f from Holborn Island, which, in 

 general appearance, agrees well with Dana's figure, although the 

 median frontal lobe is obtuse and a little more prominent than 

 the laterals, and the dactyli are triunguiculate. 



Henderson has expressed his divergence from the view of 

 De Man | that P. obesulus and P. unguiculatus are synonymous, 

 but the above facts certainly favour the views of the latter 

 author. 



Rhaphidopus ciliatus Stimpson. 



1858. Stimpson, Proc. Acad. Nat. Pci. Philad. p.241. 

 1892.0rtmann, Zool. Jahrb. Syst. Bd.vi. p.226, pi. ii. fig.16. 



Port Curtis; two specimens dredged in seven fathoms. 



Our specimens are in fairly close agreement with Ortmann's 

 figure (loc. cit.), differing only in being rather more rugose. 

 The antero-lateral angles are more prominent than figured, and 

 are somewhat tuberculose; the postero-lateral angles are also 

 somewhat more pronounced, giving to the carapace a squarer 

 aspect. 



The chelipeds are scarcely so elongate, and the merus is armed 

 with two tuberculate ridges above. The inner margin of the 

 carpus is strongly tuberculate, and there are tubercles on the 

 lower half of the palm and on the dactylus; the digit also is 

 ridged with tubercles. 



*Dana, U.S. Explor. Exped. Crust, i. p.411, pl.xxvi. fig.l, 1852. 

 f Haswell, Cat. Aust. Crust, p. 147, 1882. 

 jDe Man, Archiv f. Naturg. p.442, 1887. 



