48 ZOOLOGY OP THE VOYAGE OF H.M.S. SAMARANG. 



In colour this pretty and curious genus is of a pale yellow, marbled with light pinkish 

 brown on the lateral regions of the carapace, and a broad scarlet longitudinal stripe extending 

 from the front to the hind margin, narrowed opposite the orbits and in the middle of the 

 back. The fore-legs are marbled with scarlet and yellow, with a broad scarlet band in the 

 middle of the fifth joint, and two broad bands of the same colour on each claw. The 

 hind-legs are light pinkish yellow, with broad transverse scarlet bands. 



3. CHARYBDIS, Be Haan. 



1. CHARYBDIS DURA, Adams fy White. 



Thorace valde duro, lsevi, marginibus lateralibus quinque-dentatis, primo et secundo dentibus ad basin 

 denticulo minuto instructo. 



Fronte sex dentibus obtusis, dente externo prominentiore quam in speciebus abis. 



Chelis carpo externe scabro, tuberculato, interne spina longa crassa in medio, manu rnargine superiore 

 spinis sex in serie duplicate parallela dispositis, externe carinis tribus longitudinabbus. 



Pedibus posterioribus externe spina magna prope extremitatem. 



Hab. Mauritium. 



Carapace very hard and smooth, lateral margin five-toothed, the first and second teeth 

 with a minute tooth at the base. 



Front with six large bluntish teeth, the external tooth rather more prominent than 

 in the other species. 



Fore-legs with the fourth joint rough and tubercular on the outside, with a very long 

 thick spine on the middle of the inside, the fifth joint with six spines, in two parallel rows, on 

 the upper edge, and three longitudinal keels on the outside. 



Hind-legs with a large spine on the outside near the end. 



Hab. Mauritius. 



VI. OCYPODID.E. 



Species of Oeypode and Gelasimus are extremely numerous throughout the islands of the 

 China Sea. Every sandy shore is perforated above high-water mark with the holes of the 

 former, and the banks of the rivers, the mangrove swamps, damp forest margins, and muddy 

 places near the sea, are peopled with the latter, which form oblique burrows frequently 

 penetrating to a considerable depth. The Ocypodes appear to be chiefly crepuscular in their 

 habits, remaining concealed in their holes during the heat of the day, but as evening 

 approaches running side-ways In a curvilinear manner at the edge of the sea, where the 

 waves break along the sandy shores. The Gelasimi remain concealed in their burrows 

 during the high tide or in the dry hot part of the day, but delight to come out of their holes 

 after a shower, or when the tide has receded and left their mud banks moist, but they never 



