96 L. A. BORRADAILE. 



of a few liours. The Ocypodes appear to find their food by sight, rather than by smell 

 like Coenobita. 



ii. Ocypode cordimana, Desm, 



While it is alive, this crab is easily distinguished from 0. ceratophthalma by its darker 

 and more brownish colour, but when preserved in spirit it takes on much the same dull 

 greyish-green hue as the other species. The two are, however, always quite easily separated 

 by the absence, from 0. cordimana, of the stridulating apparatus found in 0. ceratophthalvia 

 as in all the rest of the genus. Their habits are also considerably different. Unlike the 

 strand-haunting ceratophthalma, cordimana lives inland, digging its burrows in the light 

 sandy soil along the paths and open spaces of the island. Instead of being directed down- 

 wards, these burrows usually take the form of more or less horizontal galleries with two, 

 or sometimes three, openings. I have not found leaves, seaweed or food of any sort in 

 those that I have opened, but they run among the roots of the vegetation and these may 

 perhaps serve for food. 



Two points of interest are raised by the facts just mentioned. In the first place it 

 is worth remarking that the darker colour of 0. cordimana harmonises better with that 

 of its earthy environment than would the sandy hues of 0. ceratophthalma. In the second, 

 the existence of a species whose burrows are situated on land, well above the tide-mark, 

 invalidates the conclusions, as to the raising of the land in Diego Garcia, drawn by Bourne^ 

 from the presence of Ocypod-holes in certain situations there. The form of these holes 

 would have to be carefully investigated before any such conclusions could be drawn from 

 them. 



III. A LIST OF LAND AND FRESH WATER CRUSTACEANS COLLECTED IN THE MaLDIVE 



Islands. 

 I am indebted to Mr Stanley Gardiner for the notes incorporated in the following list. 



BRACHYURA, CATOMETOPA. 

 Family Ocypodidae. Genus Ocypode, Fabr., 1798. 



1. Ocypode ceratophthalma (Pallas), 1772. 



For references, see above, p. 67. 



Generally distributed throughout the group. 



2. Ocypode cordimana Desm., 1825. 

 For references see above, p. 67. 



All the larger islands of the group except in Suvadiva and Addu atolls. 



Genus Uca, Leach, 1815. 



3. Uca annidipes (H. M.-Edw.), Ib37. 



Gelasimus annidijyes, H. M.-Edwards. Crust. II. p. 55, pi. XVIII. figs. 10—13 (1837); Alcock, 

 As. Soc. Bengal LXix. ii. 3, p. 353 (1900) [references]. 



Uca annulipes, Ortmann, Zool. Jahrb. Syst. X. p. 355 (1897). 

 Mangrove Swamp, Furnardu, Miladumadulu atoll. 



1 Bourue, P. B. S., vol. 43, p. 445 (1888). 



