JOURNAL 



ON THE 



ASIATIC SOCIETY OF BENGAL. 



Vol. LXVIII. Part II. -NATURAL SCIENCE. 

 No. I.— 1899. 



Materials for a Carcinological Fauna of India. No. 4s. The BracJiyura 

 Cyclovtetopa. Part II. A Revision of the Gyclometopa with an 

 Account of the Families Portunidse, Gancridse and Gorystidse. By 

 A. Alcock, M.B., C.M.Z.S., Superintendent of the Indian Museum. 



[Received 16th March. Read 5th April, 1899.] 



In correction of my previously expressed opinion {Journal 1898, 

 Vol. LXVII, pt. II, pp. 68 and 69) I now have no hesitation in accept- 

 ing the limits of the Gyclometopa that have been fixed by Miers in 

 Challenger Brachyura, pp. 106-215. I am not, however, in agreement 

 with Miers subdivision of this great group. 



It seems to me that Ortmann (Zool. Jahrb., Syst., &c., VII, 1893-94 

 and IX, 1895-97) has struck out a much more natural classification of 

 the Gyclometopa ; but as he includes the Parthenopidae and excludes 

 the Gorystidse, I am unable to adopt it in its entirety. There can be 

 little doubt, however, that Ortmann's conceptions of Xanthini and 

 Cancrini agree with nature. 



The present paper contains (I) a statement of my own views as 

 to the classification of the Gyclometopa, and (2) diagnoses of the 

 Indian genera and species of three of the constituent families, namely, 

 the Portunidse, the Gancridse and the Gorystidse. 



The Indian species of Portunidse, as far as I know, number 67 or 

 68, of which 65 are represented in the Indian Museum : of CancridjB 

 4, all of which are in the Indian Museum : of Gorystidas only one — 

 a new species of Nautilocorystes dredged by the R. I. M. S. " Investi- 

 gator." 



J. II. 1 



