REPORT ON THE ANOMURA. 113 



however, probably an extended distribution in the Indo-Pacific region. I have examined 

 fresh specimens taken recently by Mr. E. Thurston, the Superintendent of the Madras 

 Government Museum at Edmeswaram, South India, on the carapace and chelipedes of 

 which circular patches of a brownish hue with a lighter centre were apparent. Immersion 

 in spirit appears to have the effect of rapidly removing these colour markings. 



Genus Raphidopus, Stimpson. 



Raphidopus, Stimpson, Proc. Acad. Nat. Soi. Philad., p. 66, 1858. 



Carapace suborbicular, the breadth greater than the length. Frontal region not 

 prominent and almost straight, armed with three minute teeth. Eyes of small size. 

 Antennal peduncle elongated. Chelipedes elongated, with narrow curved digits ; 

 ambulatory limbs slender, the dactyli flattened and ciliated, almost straight, with 

 the apex acute. 



The form of the carapace, chelipedes, and ambulatory limbs, render this one of the 

 most distinct genera in the group. Only a single species has hitherto been described, 

 but the writer has recently taken a second with well-marked points of difference in the 

 Indian Seas at Madras. 



Raphidopus ciliatus, Stimpson. 



Raphidopus ciliatus, Stimpson, Proc. Acad. Nat. Sci. Philad., p. 79, 1858. 



„ ,, Targioni Tozzetti, Crest. "Magenta," p. 222, tav. xiii. fig. 4, 1877. 



Habitat. — Hong Kong; depth, 10 fixthoms. An adult male with the carapace 

 measuring 9 mm. in length, by 11 "5 mm. in breadth, and the right chelipede (unstretched) 

 with a length of 31 mm. 



The type was dredged ofi" Hong Kong at a depth of 6 fathoms. No locality is 

 assigned to the specimens taken by the " Magenta." 



Genus Pachyclieles, Stimpson. 

 Pachycheles, Stimpson, Proc. Acad. Nat. Sci. Philad., p. 66, 1858. 



Carapace suborbicular, the length not exceeding the breadth, witli the posterior 

 part of the branchiostegite quadrate, and separated by a slight membranous interval 

 from the larger anterior portion. Front but little produced, without distinct teeth. 

 First joint of the antennal peduncle slightly elongated. Chelipedes massive and rugose, 

 the carpus short. Dactyli of the ambulatory limbs normal. 



The majority of the species inhabit the Indo-Pacific area. 



(ZOOL. CHALL. EXP. — PART LXIX. 1888.) 2zZ 15 



