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



Tympanomcrus stapletoni, de Man. 



igo8. Tympanoincvus stapletoni, de Man, Rec. hid. 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 gre}^- 

 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 : — 



■'^^ '( Jhalakati, Backergunj dist., H. P.. Stapleloii. Many, includ- 



■if^i ] Bengal. ing Types. i 



"i"o~ Kanaigunj, Backergunj dist., ,, Six. 



Bengal . 

 ^\%^ Banks of Passur R., Khulna, l^engal Fish. Depl. (B. Forty. 



Bengal. Prashad) and S. Kemp; 



Oct., 1917 ; July, 1918. 

 §|§^ Banks of Hugfili 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. 



Tympanomcrus deschampsi, Rathbun. 



1913. Tynipaiionienie ih's< hampsi , Ratbbun. Proc. i'.S. .\nf. M/is. XIAT, 



p. 356, pi. xxxii, pi. xxxiii. fig. 1. 

 IQ18. Tympauoiiiei'us deschainpsiy Kemp, Mem. .Isiuf. Soc. Bengal \ , p. 228. 



^yfy~ Banks of W'hangpoo R.. 5-10 miles .\. .Xnn.indale. One. 



below Shanghai. 



Described by Miss Rathbun from Shanghai. 



Tympanomcrus lingulatus (Rathbun). 



1909. Cleistosfoina lintruldtiini. Rathbun, i'roc. Biol. Soc. Wasliingfon 



XXII, p. 108. 



1910. Cleistostoina lingiilafii/n , Rathbun, k'. Danske \'idensk. Sehk. 



Skriff. I J), natuivid. ogmafli., V, p. 323, t(>xt-tigs. 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 Tvinpanomenis. The antennular flagella are minute 



I There seems to ha\e bec-n a mistake about 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. 



