No. 5. — Crabs from the Maldive Islands. 

 By Mary J. Rathbun. 



This collection, aside from a few land crabs and swimming crabs taken 

 at the surface, was obtained in the lagoons of the Maldi%'e atolls in 

 depths of from sixteen to thirty fathoms by the expedition of Alexander 

 Agassiz in 1901-1902. The majority come from Xallandu, Miladumma- 

 duhi Atoll. Of a total of twenty-eight species, six species seem to 

 be new. Major Alcock has described nearly all the known forms in his 

 "Materials for a Carcinological Fauna of India;" therefore the ref- 

 erences to synonymy are not repeated here except where different 

 conclusions have been reached as to the identity of species. 



It will be noted that our list furnishes several additions to the Land 

 Crustaceans, Portunidse, and Xanthidae given by Borradaile in Gar- 

 diner's Fauna and Geography of the Maldive and Laccadive Archi- 

 pelagoes, I. 1901-1902. 



The drawings were made by Miss A. A. McKnew. 



OCYPODID^. 

 Ocypode ceratophthalma (Pallas). 



Ocypoda ceratophthalma Alcock, Joum. Asiatic Soc. Bengal, LXIX. 345, 1900, and 



synonymy. 

 Ocypode ceratophthalma Borradaile, Fauna Maldive Arch., I. part I. pp. 67 and 



96, 1901. 



Male, December 23; 2 young. Kolumadulu, December 30; 9 young. 



Uca tetragonon (Hekbst). 



Gelasimus tetragonum Alcock, Journ. Asiatic Soc. Bengal, LXIX. 357, 1900, and 

 synonymy. 



Male, December 23 ; 5 males. 



This species is subject to considerable variation in the following directions : — 

 The front may be an oblong lobe, as figured by Milne Edwards,^ or may be 



1 Ann. Sci. Nat. (3), XVIII. pi. III. fig. 9, 1852. 



VOL. XXXIX. — SO. 5 



