208 A. Alcock — Carcinological Fauna of IwHa. [No. 2, 



convex, not flattened and distinctly facetted as it is in otlier species : it 

 bears, however, a strong mammillary tubercle. As in the other species, 

 there is a Avell-defined notch in the antero-lateral margin between the 

 hepatic and branchial regions — the notch as usual being in continuity 

 with a crease in the pterjgostomian face, and this with a groove in the 

 lateral wall of the carapace. 



The external maxillipeds are granular and hairy distally, being alike 

 in both sexes. 



The chelipeds are alike in both sexes and are about twice the length 

 of the carapace : all the surfaces of the arm in the greater part of its 

 extent are vesicular-granhlar, but the granules are only just visible to 

 the naked eye. The hand is short, about one-third the length of the 

 carapace (without spine), and is somewhat inflated. The fingers are 

 markedly longer than the hand, the dactyl us being about half again as 

 long as the outer border of the hand. 



The long penultimate piece of the abclomen of the male carries a 

 stout terminal denticle. 



Colours in spirit much as in M. hrevimana, the regions of the cara- 

 pace being defined by broadish orange-red markings, and the chelipeds 

 havino- some broad cross-bands of the same colour, but these never in- 

 volve the fingers, which are white. 



In the male the carapace is 13 millira. long (without spine) and 

 11 millim. broad, in the female 15 millim. long and J 3 millim. broad. 



In the Indian Museum are 52 specimens, including adult males 

 and ovigerous females, from the Andamans, Maldives, Palk Straits, 

 and from off Ceylon 34 fms. 



In many adult females, as in most young, there is in the middle 

 of the carapace a cruciform constellation of 5 enlarged bead-like gra- 

 nules or denticles. In the young also the side wall of the hepatic 

 region is not so much inflated and even shows traces of flattening, 

 while the tumid intestinal region is surmounted by an enlarged granule, 

 and on either postero-lateral margin (in the very young), just above 

 the last pair of legs, is a denticle or enlarged granule. 



45. Myra elegans, Bell. 



Myra elegans, Bell, Trans. Linn. Soc. Vol. XXI. 1855, p. 297, pi. xxxii. fig. 4, 

 and Cat. Leucos. Brit. Mus. p. 13. 



Carapace elongate-oval tapering to a long acute spine at the 

 posterior margin, half again as long as broad without the spine, nearly 

 twice as long as broad with the spine. On either side of the spine is a 

 spinule situated at either extreme of the short posterior margin, and a 

 little in advance of these, on either postero-lateral margin, just above 

 the last pair of legs, is sometimes a sharp denticle. 



