XXIV. THE FAUNA OF BRACKISH PONDS 

 AT PORT CANNING, I.OWKR BENGAlv, 



Part X. — Decapod Crustacea, with an account of a smai.1. 



COI,I.ECTlON FROM BrACKISH WaTER NEAR Cai^CUTTA AND 



IN THE Dacca District, Eastern Bengai.. 

 By Dr. J. G. de Man, lerseke, Holland. 



The collection of Decapod Crustacea, chiefly gathered in 

 brackish water ponds at Port Canning, comprises eleven species, 

 three of which are new to science. Ver}^ interesting are also the 

 numerous specimens of Palcemon lamarrei^ H. M. Edw., a species 

 that, since its first description in 1837, ^i^l no more appear in 

 literature, or that has been misunderstood. 



The collected species are the following : — 



Scylla serrata (Forsk.), de Haan. 



Tympanomerus stapletoni, sp. nov. 



Pachygrapsus propinquus, sp. nov. 



Varuna litterata (Fabr.), M. Edw. " ■'. : '•.■/■ 



Metaplax dentipes (Heller). . • ", ' 



Leander, sp. .. / . 



Palcemon {Eui>alcBmon) lamarrei, H. M. Edw. ■' .''-/;■■ 



Palcemon, sp. •.',..- 



Caridina, sp. '.'. c'''i 



Caridina propinqua, sp. nov. 



Caridina nilotica (Roux), var. bengalensis, var. nov. 



The last-mentioned species is described in another paper, which 

 appears at p. 255 of this Journal, entitled '^' On Caridina nilotica 

 (Roux) and its varieties." 



I. Scylla serrata (Forsk.), de Haan. 



Scylla serrata (Forsk.), de Haan, Alcock, " Materials for a Car- 

 cinological Fauna of India," No. 4, pt. ii, Calcutta, i8gg, p. 27 

 {ubi synon.). 



Two young males and a female of medium size from Port Can- 

 ning (estuary of the Matla River). 



The carapace of the female is 95 mm. broad and 64 mm, long. 

 Outer angle of the wrist of the chelipedes with one small spine. 

 In the smaller of the two males the last antero-lateral spine of the 

 carapace is distinctly larger than the rest ; the distance between the 

 tips of these teeth, i.e., the greatest breadth of the carapace, mea- 



