158 Records of the Indian Museum. [Vol. XXIV, 



as to conceal the dactylus. The dactylus itself has a small tooth 

 on the posterior margin and is strongly curved and only about one- 

 sixth the length of the propodus. 



The sixth abdominal somite is very little longer than the fifth. 

 The anterior of the two pairs of dorsal spines on the telson is situ- 

 ated in the middle of its length ; the posterior pair is a little 

 nearer to the apex than to the anterior pair. The external margin 

 of the outer uropod is ciliated. 



The largest of the three specimens, an ovigerous female, is 

 about 13 mm. in length. 



This species is clearly allied to P. latipollex, P. laccadhensis 

 and P. aicocki, but is easily distinguished by numerous well-marked 

 characters. 



C405/1. Mergui Archipelago, 1 2°48' 'Investigator.' One. Type. 



N., 98°i6'io"E., 24 fms. 



The other two specimens belong to the Paris Museum and 

 were obtained by M. Heartel at Mozambique in water 20-25 m. 

 deep. 



Periclimenes (Periclimenes) rex, sp. nov. 

 (Plate V, fig. 5.) 



The rostrum extends beyond the end of the antennular pedun- 

 cle but does not reach the tip of the antennal scale. It is extreme- 

 ly deep in lateral view and is very strongly curved downwards. 

 The convex upper border is^serrated like a saw and in the single 

 specimen examined, bears 22 small equidistant teeth, with one 

 additional tooth placed far back on the carapace and widely 

 separated from the rest. The lower border is unarmed and is 

 strongly convex in its distal half. 



There is no supra-orbital spine. The lower limit of the orbit 

 is drawn out into a narrow pointed process, beneath which is the 

 antennal spine. The hepatic spine is large and placed 011 a lower 

 level than the antennal. 



In dorsal view the eyestalk is widest at the base ; the cornea 

 is rounded and scarcely wider than the stalk, on which it is set 

 obliquely. The ocular spot is distinct and touches the cornea. 



The antennular peduncle reaches only to about two-thirds the 

 length of the antennal scale. The basal segment is very broad 

 with a short lateral process. The distal margin external to the 

 insertion of the second segment is produced anteriorly as a round- 

 ed lobe (text-fig. 25ft) ; this lobe bears the customary terminal 

 spine on the outer side of its apex and extends almost as far for- 

 wards as the articulation between the second and third segments. 

 The external margin of the second segment is similarly produced 

 beyond the insertion of the third segment. The free portion of 

 the shorter of the two rami composing the outer antennular 

 flagellum is about half the length of the fused part, the latter 

 comprising 7 segments. The antennal scale (text-fig. 25a) is 



