AMPHIPODA. 277 



This species is certainly very near Mcera festiva, Chilton, ' Proc. Linn. Soc, 

 N.S.W.,' vol. 9, Part 4, p. 3, Plate XLVL, fig. 2. As, however, Professor Chilton 

 has only described the antenna' and gnathopods, and as both of these differ somewhat 

 from the specimen described above (considering also the distance between Sydney and 

 Ceylon), it seems better to consider them as distinct. It is unfortunate that, in both 

 cases, the 3rd uropods, so important in this family, should be wanting. 



Elasmopus spinimanus, n. sp. Plate V., figs. 36. 



Reef, Galle, Station XXXVIII. 



Very near E. rapax, from which it differs in the following points : 



The hind margin of the epimere of the 3rd pleon segment is slightly concave, the 

 lower margin convex with submarginal spines, the posterior angle upturned, acute 

 (fig. 36. pl>). 



The 1st gnathopods have the hand longer than the wrist, the palm very oblique 

 and only defined by a spine. The anterior angle of the side-plates is rounded. 



The hand of the 2nd gnathopods in the male has no tubercle, except near the base 

 of the dactylus ; this is flat-topped and cvoivned 'with 7 or 8 spines; below this is a 

 roiv of 6 spines on the distal third of the hind margin, with rather scanty fascicles of 

 setna below this. The side-plates are rounded below (fig. 36. gn. 2 . <$). In the female 

 the limb nearly resembles that of E. rapax, female. 



The last 3 pairs of perasopods are more slender than in E. rapax ; the 1st joint with 

 the hind margin obscurely serrate, and in the 3rd pair concave. 



The 3rd uropods have the rami subequal in length and breadth, and considerably 

 longer (as 5 : 3) than the peduncle, the outer with 4 fascicles of spines on the outer 

 margin (fig. 36. up. 3 ). 



The divisions of the telson are narrower at the end and more deeply notched. 



Length 5 millims. 



From E. affinis, Dell A Valle, it differs in the absence of the median tubercle and 

 the presence of the 6 spines on the hind margin of the hand of the 2nd gnathopods. 



Elasmopus serrula, n. sp. Plate VIII., figs. 37. 



Galle; basket hung to buoy, 9th May, 1902, 1 male; from pearl oyster washings, 

 ( 'heval Paar, several. 



This species resembles E. rapax in the form and character of the body, the head, 

 antennae, mouth organs, peraeopods (so far as relates to their proportions), and 

 uropods. 



The 3rd pleon segment has the hind margin almost straight, the lower convex and 

 the posterior angle a little produced and upturned. 



The side-plates of the first gnathopods have the front margin concave and the angle 

 rounded; the limb as in E. rapax. 



The 2nd gnathopods in the male have the hand of similar form to E. rapax, 



