186 A. Alcock — Care biological Fauna of India, [No. 2, 



Ebalia, Bell, Brit. Stalk-eyed Crust, p. 139, and Trans. Linn. Soc. Vol. XXI. 

 1855, p. 303, and Cat. Leucos. Brit. Mus. p. 16. 



Ebalia, Miers ' Challenger ' Bracbyura p. 303 (part). 



Carapace rbomboidal or pentagonal or hexagonal ; commonly, but 

 not always, a little broader than long; its regions generally well 

 defined and tumid, the tumid portions nodular or granular : its posterior 

 margin is generally a little prominent and either bilobed, or with its 

 extreme ends dentiform. 



The front is not much produced in Indian species, except in Ebalia 

 ( PJilyxia) ero sa . 



In the orbital wall, as usual, there are three sutures, and a gap at 

 the inner canthus : the edge of the roof of the orbit is considerably 

 emarginate. The antennules fold obliquely or nearly transversely. The 

 antenna? are minute but distinct. 



The buccal cavern is moderately elongate : the exopodite of the 

 external maxillipeds is not dilated, its outer edge is a little curved : 

 the triangular merus of the external maxillipeds is about § the length 

 of the ischium measured along the inner border. 



The chelipeds are variable : they are usually massive. In the 

 typical Ebalia forms they are short — not much' more than half again 

 as long as the carapace — and stout, with short broad hands not much 

 differing in length from the stout compressed fingei's. 



The abdomen of the male consists of 3 or 4 pieces. 



Key to the Indian species of Ebalia. 



I. Front much produced : carapace markedly 



longer than broad E. erosa. 



II. Front not produced : carapace either a little 

 broader than long or a very little longer 

 than broad : — 



1. Edge of buccal cavern projecting a 

 little beyond the front : posterior 

 border of the carapace with three 

 rounded teeth in the male and 

 two (much less distinct) in the 

 female: a large granular "broad 

 arrow " on the carapace the ends 

 of the wings of which project 



beyond the postero-lateral margin... E. sagittifera. 



2. Edge of front projecting beyond the 

 epistome : ends of posterior margin 

 thickened and obscurely dentiform. 



