1918.] Stanlfa- IvEAir : Decapoda of tlic Inle Lahe. 93 



In examples between 30 and 40 mm. in lent>th they are a little shorter. 

 The proportions of the different segments may be deduced from the 

 measurements given below. The carpus is longer than the merus and 

 the merus than the ischium. The dactylus is a shade shorter than the 

 })alm and the entire chela is a little longer than the carpus. The 

 chela is slightly curved and the fingers are without any trace of teeth 

 on their inner margins. 



The last three pairs of peraeopods are slender and similar in length, 

 the fifth being slightly the longest. When stretched forwards they all 

 reach beyond the antennular peduncle, but fall short of the apex of the 

 scale. The merus of the third pair is a little more than nine times as 

 long as broad and is about one and a third times the length of the carpus. 

 The propodus is slightly shorter than the merus and is very nearly four 

 times the extreme length of the dactylus. In the fifth pair of legs the 

 propodus is proportionately longer and is about one and a sixth times 

 as long as the merus and seven times the length of the dactylus. The 

 merus is rather less stout than in the third pair and is one fifth longer 

 than the carpus. There are series of spinules on the posterior border 

 of the propodi of all three pairs, but none on the merus. At the distal 

 end of the fifth propodus there is a thick fringe of setae. There are 

 setae also on the dactylus, which is simple, slightly curved and with a 

 large terminal claw (pi. xxv, fig. 4). The branchial formula is the same 

 as that of other species of the genus. ^ 



The sixth abdominal somite, measured dorsally, is about one and 

 half times the length of the fifth and about two-thirds as long as the 

 telson. The telson bears the usual two pairs of dorso-lateral spinules 

 and ends in a rather broad apex which is produced to an acute point. 

 The innermost of the two pairs of terminal spinules are very long, ex- 

 ceeding the produced apex of the telson by at least two-thirds of their 

 length (pi. xxv, fig. 5). 



The appendix masculina is fully developed in specimens less than 

 35 mm. in length. The largest individual is a male 72 mm. in length. 

 Unfortunately none of the females are ovigerous. Seven specimens 

 yield the following measurements : — 



Second peraeopod : length of 



— o 



1 As tabulated by Coutiere, Ann. Sci. Nat., Zool. (S), XTT, p. 270 (1891). 



