1919-] ^- Kemp: Notes on Crustacea Decapoda. 343 



(iv) The oblique rows of tubercles on the branchial region are 

 better developed than in the allied form and the most posterior of 

 them is more transverse than longitudinal ; if the line formed by 

 this row were continued 

 forwards it would cut the 

 outer end of the orbital 

 border on the opposite 

 side. 



(v) The chelae of the 

 male (text-fig. 17) are 

 strongl}- developed, much 



deeper and longer than '^'f.^y-vw.. \].—Tymtyanomerus f rater, s^.nov. 

 those of the female. Chela of male. 



(vi) In addition to 

 those mentioned in the description of T. stevensi there is a large 

 tympanum on the upper surface of the merus of the penultimate 

 walking legs. 



(vii) The borders of the meral segments of the walking legs 

 are microscopically beaded, not spinulose as in the allied species. 



(viii) There is no tomentum on the carpus and propodus of 

 the second walking legs of the male. 



(ix) A fringe of dark brown bristles, not found in the 

 preceding species, occurs on the edge of the sternum between each 

 pair of walking legs. 



(x) The abdomen of the male closely resembles that of 

 T. stevensi, but the fifth segment is proportionately a little longer 

 and its sides are more sinuous. 



In all other respects the species are in the closest agreement ; 

 notably in the presence of a groove extending from the edges of 

 the buccal cavern to the base of the penultimate legs, in the cari- 

 nation of the palm and subspatulate form of the fingers, and in 

 the dorsal carinae on the two intermediate pairs of legs. The two 

 species were, moreover, found together 



I was at first of the opinion that two forms of a single species 

 were represented ; but the differences, though many of them are 

 small, are too numerous to admit of this possil^ilit}'. I have 

 been able to separate even the youngest specimens without any 

 great difficulty and have seen adult males and females of both 

 species. 



In an adult male of T. frater the anterior breadth of the cara- 

 pace is 5-6 mm., its length 4-0 mm. and the breadth of the front 

 about 0'9 mm. In a female these measurements are respectively 

 5-0, 3*6 and 0'8 mm. and in another female, which is ovigerous, 

 5-0, 3-5 and 075 mm. 



The specimens are of a bluish- grey colour in spirit, sometimes 

 rather darker than T . stevensi. 



^m;- Karachi. (. K. Slewivs ; March, May, njij. Twcniy-six. 



Four of the females are ovigerous. The types bear the num- 

 ber 9861/ 10, Zool. Surv. Ind. 



