228 Records of the Indian Museum. . [Voi,. XXIV, 



instead of being attached only by its apex (obviously an impos- 

 sible arrangement), is joined in normal fashion to thepropodus, the 

 free edge of the latter being almost entirely concealed by the overly- 

 ing ischium and merus. The erroneous division of the propodus 

 into two segments is also seen in the figure of Oedipus superbus on 

 the same plate. I give here (text-fig. 66) a copy of Dana's figure, 

 together with another in which the more important errors have 

 been eliminated. The latter does not differ in any notewortlvy 

 feature from the normal type. 



One of the specimens I have seen I doubtfully refer to H. lu- 

 tescens. This individual has a normal second maxilliped and, as in 

 H. beaupresi and H. depressus, possesses an arthrobranch on the 

 third maxilliped. In H. gerlachei, as Tattersall has pointed out, 

 this gill is suppressed and the species is otherwise peculiar in the 

 absence of the hepatic spine.. Tattersall has suggested that a new 

 genus may be required for the species, but with this I am unable 

 to agree and think that if any change is to be made it should be 

 in the direction of merging Harpilius in Periclimenes. 



Owing to inadequate original description the recognition of 

 Dana's H. lutescens, Stimpson's H. depressus and of the form 

 which Ortmann called Anchistia spinigera is attended with much 

 difficulty, and the possibilities of erroneous identification in this 

 paper are enhanced by the fact that the specimens I have seen are 

 all from the western part of the Indo-Pacific region while the des- 

 criptions are based on material found much further to the east. 



The species of Harpilius, as I understand them, ma}' be 



separated by the following characters : — 



A. Hepatic spine present. 



B. Anterolateral angles of carapace rounded ; ischium 

 of second leg with at least one spine situated at distal , 

 end of lower border, merus with spine at distal end of 

 upper border, fingers with i to 3 large teeth. 

 C. Antennal spine remote from lower orbital angle 

 and flanked by a carina ; hepatic spine on same 

 level as antennal ; antepenultimate segment of 

 third maxilliped 3 limes as long as broad; ischium 

 of second leg with 3 distal spines, 1 above and 2 

 below, carpus with dorsal spine, 1 tooth on dactylus 

 and 2 on fixed ringer ; R. 4-7 : 2-4 ... ... beaupresi (Audouin). 



C. Antennal spine close to lower orbital angle, with- 

 out carina ; hepatic spine on much lower level than 

 antennal ; antepenultimate segment of third maxil- 

 liped 6 times as long as broad ; ischium of second 

 leg with 1 distal spine placed interiorly, carpus 

 without dorsal spine, 2 teeth on dactylus and 3 on 

 fixed finger. 



D. Merus and palm of second leg each 3 times as 

 long as broad ; posterior pair of dorsal spines of 

 telson placed much nearer to anterior pair than 

 to apex; R. 5-7: 2-5 ... .. ... depressus Slimpson. 



D'. Merus and palm of second leg each 5 times as 

 long as broad ; posterior pair of dorsal spines of 

 telson placed midway between anterior pair and 

 apex; R. 7 : 4 ... ... ... vm. gracilis, now 



B'. Anterolateral angles of carapace rectangular , is- 

 chium of second leg unarmed, merus without spine at 



