236 A. Alcock — Carcinological Fauna of India. [No 2, 



The rostrum, which is between one-third and one-fourth the length 

 of the carapace proper, consists of two divergent spines fused together 

 at the base and slightly incurved towards the tip. The anterior angle 

 of the supra-ocular eave is produced forwards as a sharp spine. 



The chelipeds in the adult male are equal to the length of the 

 carapace behind the bifurcation of the rostral spines : they are hardly 

 stouter than the other legs, except as to the palm, which is short and 

 inflated : the fingers, which are three-fourths the length of the palm, 

 are strongly arched, and meet only at the tip. 



In the female the chelipeds are not quite as long as the post-orbital 

 portion of the carapace, are slenderer than the other legs, and have the 

 palm slender and the fingers closely apposable throughout. 



The ambulatory legs are short and stout: the first pair, which are 

 considerably the longest, are rather longer than the carapace and ros- 

 trum : the merus and carpus in all are nodose on the dorsal surface, 

 and the dactyli are strong and claw-like : always in the first pair, and 

 sometimes in the succeeding pairs, the merus has a row of coarse spines 

 along its front margin, and the carpus a single stout spine. 



Herbst'a figure is either a young male, or, more probably, a female. 

 The figure given by A. Milne-Edwards (loc. cit.) is very correct; bub I 

 do not see how Miers, who cites this figure with affirmation, can call the 

 chelipeds in the male slender : they are, like the other legs, stout, and 

 the hands are distinctly massive. 



In the Museum collection are specimens from Ceylon, from the 

 Andamaus, and from Mergui ; as well as an adult male and female from 

 Samoa obtained from the Museum Godeffroy. 



Sub-family IV. MAIINvE. 



Eyes either (1) with orbits, which are either incomplete or com- 

 plete, but are always complete enough to entirely conceal the cornea, 

 when fully retracted, from dorsal view ; or (2) but partially protected 

 by a huge horn-like or antler-like supra-ocular spine, or by a large 

 jagged post-ocular tooth, or by both. 



The orbit in the first case is formed in one of two ways : there is 

 always au arched supra-ocular eave, and a prominent post-ocular spine ; 

 and either the interval bet wee u the eave and the spine is filled by an 

 intermediate spine which completes the orbital roof; or the supra- 

 ocular eave and the post-ocular process are in close contact with one 

 another, and with a process of the basal antennal joint below, so as to 

 more or less complete the floor also of the orbit. 



The basal antennal joint is always very broad, and either has its 

 outer angle produced to aid in forming the floor of the orbit, or is armed 

 distallv with one or two large spines. 



