440 Carcinological Fauna of India. 



Filhol, Crust. N. Z., Miss. I'ile Catopbell, p. 394 : Haswell, Cat. Austral. Crnst, 

 p, 112 : Miiller, Verb. Ges. Nat. Basel, 1886, p. 476 : de Man, Arch, f . Nat. LIII. 1887, 

 i. p. 372, and Notes Leyden Mas. XV. 1893, p. 287, and Zool. Jalirb., Syst., IX. 

 1895-97, p. 358 : Pocock, Jour n. Linn. Soc, Zool., XX. 1890, p. 513: Henderson, 

 Trans. Linn. Soc. Zool. (2) V. 1893, p. 391 : Ortmann, Zool. Jahrb., Syst., VII. 1893- 

 94, p. 731 : Whitelegge, Mem. Austral. Mus. III. 1897, p. 139 : M. J. Eathbun, Ann. 

 Inst. Jamaica, I. 1897, p. 36. 



Carapace thin, disk-like, covered with little short bristles which, 

 however, leave certain symmetrical raised linear patches bare : the 

 meropodites of the legs are clad iu the same way, and have two long 

 bare stripes. 



The front, the antennular and snpra-orbital angles, and the epis- 

 tome are all acutely spinous : the antero-latei^al border of the carapace 

 is armed with 4 acute spines : the middle of the upper border of the 

 orbit is more or less serrate. The eyes are large and i^niform. 



The chelipeds vary according to age and sex, but the arm and 

 wrist are always armed with spines ; the palm is smooth, nude, oval, 

 and somewhat compressed ; and the fingers are short, blunt, and hol- 

 lowed at tip. In the adult male the palms, or one of them, are remark- 

 ably deep. 



The anterior border of the meropodites of all the legs is armed 

 along its whole length with remarkably large and even spines, the pos- 

 terior border ends in a spine : in the case of the first two meropodites 

 there is a second row of spinules parallel with the anterior border, but 

 this is very indistinct in the mei'opodites of the 3rd pair, and quite 

 absent in those of the 4th. 



The colour in life is dark green, the nude streaks being bright 

 green. In the Indian Museum are 36 specimens from the Andamans, 

 Ceylon, and Laccadives : the carapace of the largest is 23 millim. long 

 and 21 broad. 



Family GEOCARCINID^, Dana. 



Key to the Indian Genera. 



I. Fron to- orbital border more than half the maximum breadth 

 of the carapace : interantennular septum broad : epistome 

 well defined and prominent : dactyli of legs with 4 rows of 

 spines : — 



1. Buccal cavern not elongate : exognath of external 

 maxillipeds without a flagellum : opposed edges of the 

 basal joints of the 2nd and 3rd pairs of legs heavily 

 fringed with hair much as in Ocypoda : — 



1. Antero-lateral borders of carapace dentate Gbapsodes. 



ii. Antero-lateral borders of carapace entire EriGBAPaus. 



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