XVI. — Materials for a Carcinological Fauna of India. No. 6. The 



Brachyiira Catometo]pa, or Grapsoidea. — By A. Alcock, M.B., 



C.M.Z.S., Superintendent of the Indian Museum. 



[Received 25th June; Read 4th July.] 



In treating the Catometopes I bare in the main followed the scheme 

 of Milne Edwards {Annates des Sciences Naturelles for 1852 and 1853) 

 as modified by Dana, and I may introduce this paper with a statement 

 of the points at which it deviates from the former of those classical 

 works. 



In the first place, following Dana and most subsequent author's, I 

 have evicted the Telphusidse. With them must also go Gecarcinucus, 

 which is an undoubted Telphusoid, although it is persistently ranked 

 with the Geocarcinidae. 



Again I have followed the lead of Dana in his treatment of the 

 Gonoplacsea of Milne Edwards, the genera of which are distributed 

 among the Ocypodidee and the Sesarmiue Grapsidse, while Gonoplax itself 

 is relegated to the Oarcinoplacidse. 



This step necessitates a considerable enlargement of Milne Edwards' 

 group of Carcinoplacinas, and a reconstruction of his Ocypodinse, and in 

 carrying this out I have in the main followed Dana's admirable system. 



The isolation of Myctiris as an independent family, which was first 

 suggested by Dana, is here accented, but at the same time I fully agi-ee 

 with Milne Edwards estimate of this singular form as a " satellite " of 

 the Ocypodoids. 



621 



