A.MPHIPODA. 247 



Platyischnopus. Stebbing, 1888. 

 Platyischnopus herdniani, n. sp. Plate II., tigs. 10. 



Periya Paar Kerrai and E. Cheval i'aar, November, 1902. 



About 21 specimens. Colour in spirit, light In-own. 



Body compressed. Head nearly as long as tbe first 4 segments, produced to a 

 point which is wrinkled or puckered, as in P. mirabilis, Stkubinu, aud surrounded 

 with short spines (tig. L0. c. d" ). No eves discernible. 



The first 3 segments are subequal and shorter than the otber mesosome segments, 

 which increase in length successively. 



The 3rd pleon segment has 2 dorsal and 1 or 2 dorsolateral teeth just below 

 the dorsal on each side on the hind margin, the posterior angle upturned, acute; the 

 lower margin convex (tig. 10. pi. 3 ). 



Upper antennae placed considerably in front of the lower; in the female they are 

 short, the 3rd joint of the flagellum reaching the end of the head ; two joints only of 

 tbe peduncle are visible, the 1st shorter than the 2nd; the flagellum 6-jointed ; 

 appendage barely reaching the end of the 2nd joint of tbe flagellum, 2-jointed, the 

 1st longer than the 2nd; the whole antenna without spines or setae, except single 

 ones at the ends of joints (tig. 10. ant. 1 ? ). 



In the male the upper antennae are entirely different : the 1st joint of the peduncle 

 is swollen and hemispherical, the 2nd twice as long as the 3rd, which has a dense 

 fringe round the distal end ; the flagellum is longer than the whole animal and very 

 slender, the 1st joint as long as the next 3 ; appendage 2-jointed, about one-fourth 

 the length of the 1st joint of the flagellum, which is more than twice as long as 

 the 2nd (tig. 10. c. J ). 



Lower antennae (female) : the 2nd joint four times as long as, and but little 

 narrower than the 1st, and one-third longer than the 3rd. with 4 nearly equi-distant 

 spines on the front margin and 2 seta? at the end of the hind ; otherwise the whole 

 antennae is naked ; the flagellum is "-jointed, as long as the last 2 joints of the 

 peduncle (fig. 10. ant. 2 ? ). 



Mandibles as in I', mirabilis (tig. 10. m.). 



Maxillipeds with the inner plate very small, and tapering, with a short spine and 

 strong plumose setae on the top ; inner edge almost smooth. Palp with the 3rd joint 

 shorter than the 2nd, widening distally. 



First gnathopods : side-plates small and narrowly oval; 1st joint as long as the 

 next two, much distended distally; wrist almost as long as the 1st joint, narrow ; 

 hand about half as long as the wrist, sub-triangular, the hind margin produced to 

 form a chela as in P. mirabilis (fig. 10. gn. 1 ). 



Second gnathopods like the first, but the wrist nearly twice as long 

 tig. 10. gn. 2 ). 



