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



Ebalia, Boll, Brit. Stalk-eyed Crust, p. 139, and Trans. Linn. Soc. Vol. XXT. 

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



Ehalia, Miers * Challenger ' Brachyura p. 303 (part). 



Carapace rhomboidal 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 witb its 

 extreme ends dentiform. 



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

 (Phlyxia) erosa. 



In the orbital wall, as upual, 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 

 antennae 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 leogth 

 of the ischium measured along the inner border. 



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

 typical Ehalia 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 fingers. 



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



£^ey 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 distiiict) 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. sagitfifera. 



2. Edge of front projecting beyond the 

 epistome : ends of posterior margin 

 thickened and obscurely dentiform. 



