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



—^^-- McroLii Archipelago. Mus. C'ollr. Three (frag- 



mentary). 

 2.5_7.s Diamond I., off ('. Negrais, ' Investigator.' One. 



Burma. 

 9«oi-.5. Kaikal Maree, nr. junction S. Kemp; Dec, iai6. Kightw. 



of Matlah and Biddah Rs., 

 Gangetjc Deha. 

 9S09 Matlah R., opposite Port Bengal Fish. Dept. (B. Seven. 

 Canning, Gangetic Delta. Prashad) ; March, 



191 8. 



The species is not known from any other locaUt^^ The 

 fragmentary specimens from the Mergui Archipelago appear to be 

 paratypes. 



Dotillopsis profuga (Nobili). 



1903. Dotilla profitga, Nobili, Boll. Mits. Torino XVUI, Xo. 447, p. 22. 



Upper Sadong R., Borneo. 



Genus Tympanomerus, Rathbun. 



1835. Cleistostoma, de Haan, in Siebold's Faun. Ja^on., Crust., p. 26. 

 1888. Dioxippe, de Man, 'Journ. Linn. Soc, Zool., XXII, p. 137 (noiii. 



praeocc). 

 1897. Tympanomenis, Rathbun, Proc. Biol. Soc. Washington XI, p. 164. 

 1900. Tympanomerus, Alcock, Journ. Asiat. Soc. Bengal LXIX, p. 371. 

 1918. Tjmpano}nerns, Tesch, Decap. Brachyiir. ' Siboga' Exped. I, p. 48. 



This genus shows signs of affinity with Scopimera in the form 

 of the abdomen and in the presence of accessory branchial passages 

 between the bases of the walking legs. It differs, however, from 

 both Scopimera and Dotilla and resembles Dotillopsis in the form 

 of the ultimate segments of the second maxilliped From Dotil- 

 lopsis it is readily distinguisl'jed by the absence of convolute grooves 

 on the side- walls of the carapace, by the much less strongly 

 sculptured dorsal surface and by the less broadly expanded fourth 

 segment of the male abdomen. 



Tympana, which are uniformly found in all other Scopimerinae, 

 are sometimes absent in species of this genus ; when present, they 

 are usually ill-defined and difficult to observe. 



Tesch has drawn attention to the presence of hairy-edged 

 pouches or orifices of accessory branchial passages in species of 

 this genus. In both T. ceratophora and T. integer he found two 

 pairs, situated between the bases of the first and second and the 

 second and third walking legs. I have found these pouches in 

 T. pusillus, T. Imgulatus and T. stapletoni, — in the last-named species 

 they occur between the third and fourth legs also. In five other 

 forms that I have examined the tufts of hair are absent or very 

 poorly developed and I am not satisfied that accessor}^ branchial 

 passages exist. 



Stimpson's genus Ilyoplax, which cannot be identified with 

 certainty until the type species has been rediscovered (see p. 310), 

 is evidently related to Tympanomerus and it seems very probable 

 that the two will prove to be synonymous. Should this happen 



