344 Records of the Indian Museum. [Vol. XVI, 



Tympanomerus stapletoni, de Man. 



igo8. Tympniiomenis stapletoiu, de Man, Rec. Ind. Miis. II, p. 212, pi. 

 xviii, figs. I, \a-e. 



This species has been found at a number of additional locali- 

 ties in Bengal and is quite common on the banks of the Hughli 

 river at Calcutta. It is evidently an estuarine form and seems to 

 occur only in places near or a little beyond the limit of tidal in- 

 fluence. At Calcutta the water of the Hughli is frequently quite 

 fresh, but under favourable conditions a slight admixture of salt 

 is to be found up to a point some little distance above the town. 



The colour of living specimens agrees in general with de Man's 

 description, but the carapace is frequently of a grey or dull grey- 

 green colour and in the male the fingers of the chelae are orange 

 and the last abdominal' segment white. 



The species is known only from the Gangetic delta : — 



•■^-i^^ ( Jhalakati, Backergunj dist., H. E. Stopleton. Many, includ- 



-^- ] Bengal. ing Types. I 



-j%- Kanaigunj, Backergunj dist., ,, Six. 



Bengal. 

 »|§^ Banks of Passur R., Khulna, Bengal Fish. Dept. (B. Forty. 



Bengal. Prashad) and S. Kemp; 



Oct., 191 7 ; July, igi8. 

 -\%- Banks of Hughli R., near S. Kemp. Many. 



Calcutta. (Sibpur, Shali- 



mar, Budge- Budge and 



Takta Ghat.) 



All the specimens are from small burrows in the mud between 

 tide-marks. 



Tympanomerus deschampsi, Rathbun. 



1913. TynipaiW7)ieiiie ch'sdioDipsi, Ratbbun, Proc. U.S. Nat. Miis. XL\'l, 



p. 356, pi. xxxii, pi. xxxtii, fig. i. 

 1918. Tvmpa)iomertis deschampsi, Kemp, Mem. Asint. Soc. Bengal \', p. 228. 



-\%^' Banks of Whangpoo R., 5-10 miles N. .\nnandale. One. 



below Shanghai. 



Described b}^ Miss Rathbun from Shanghai. 



Tympanomerus lingulatus (Rathbun). 



1909. CleistostuDia liiigiihifiiDi, Rathbun, Proc. Biol. Soc. Washington 



XXII, p. 108. 



1910. Cleistostouia lingnlntinii, Rathbun, /\. Danske Videiisk. Selsk. 



Skrift. (7), natnrvid. og math., V, p. },2^^, text-figs. 7, 8. 



This species was described by Miss Rathbun from an imma- 

 ture female found in the Gulf of Siam ; two adult males and an 

 ovigerous female have since been obtained by the R.I. M.S. 

 ' Investigator' in the Mergui Archipelago. 



There is, I think, no doubt that the species must be transferred 

 to the genus Tympanomerus. The antennular flagella are minute 



1 There seems to ha\e bet'n a mistake .ibout the precise locality of these 

 specimens ; on the label sent with them to de Man " Dacca " was certainly written, 

 but information subsequently supplied by the collector showed this to be incorrect. 



