340 



Rccoyds of the Indian Museum. 



[Vol. XVI, 



the two — trends inwards in a sinuous cuive and terminates in a 

 small angular lobule bearing a tuft of setae, immediately above 

 the base of the last pair of legs. 



There are minute tubercles, sparsely distributed, on the 

 anterior part of the side-walls of the carapace. A conspicuous 

 groove runs from the anterior angles of the buccal cavern to the 

 base of the penultimate legs.' 



The antennules and antennae do not differ appreciably from 

 those of T. pusillus, but the epistome is shorter and the broadly 

 triangular median tooth that separates the distal ends of the 

 outer maxillipeds in other species is here exceedingly narrow. 



The buccal cavern is nearly one and a half times as broad as 

 long and is completely closed by the external maxillipeds (text- 

 fig. 13). The ischium of the latter appendages is subquadrate with 

 a setose line extending obliquely across it near the anterior border. 

 The merus is a trifle shorter than the ischium and is broader 

 than long. It bears a a -shaped furrow anteriorly as in T. 

 stapletoni; it is, however, grooved near its inner edge, with the 

 margin reflected upwards and in the proximal half there is a 

 shallow median furrow which runs forward between the termina- 

 tions of the A . The surface of the merus is smooth and shining. 

 The exopod is entirely concealed and is furnished with a long 

 slender flagellum. 



The chelipeds of the male are weak, very little stouter than 

 those of the female, and decidedly less than twice the length of 



the carapace. The merus is trigonal 

 with microscopically beaded edges ; 

 it bears a tympanum internally and 

 sometimes, but not always, another 

 of larger size externally. The carpus 

 is short and smooth without a tooth 

 on its inner aspect; the inner margin 

 of the upper surface is crested and 

 beneath it there is a tuft of very 

 long hairs. The chela (text-fig. 14) 

 is slender, nearly three times as long 

 as the greatest height of the palm 

 and the fingers are more than one and 

 a half times the length of the upper 

 border of the palm. The latter bor- 

 der is crested and microscopically 

 crenulate; parallel with it on the inner face there is a longitu- 

 dinal row of setae. From the tip of the fixed finger four finely 

 beaded carinae run backwards on to the palm. The two median 

 ridges are parallel and disappear before reaching the middle 

 of the lower surface ; the innermost curves obliquely upwards 



J EXT-FiG. 13. — Tyuipanonienis 

 stevensi, sp. nov. 



Third maxilliped. 



^ In thi.s rt'spectthe species resembles T. f rater. In T. pusillus, T. stapletoni, 

 T. deschampsi, T. gangeticus and T. orientalis llie i^rooxc is inconspicuous and 

 is visible onl\' in the anterior part of its course. 



