280 CFA r LON PEARL OYSTER REPORT. 



hand, hind margin convex and setose. Hand wider than the wrist and widening 

 distallv, the palm about half as long as the hind margin, oblique, with a shallow 

 sinus above the palmar angle, below which is a strong spine; the hind margin, palm, 

 and sides of the hand and wrist are furnished with fascicles of setae. The dactylus 

 has the inner margin serrate' and reaches below the strong spine mentioned above. 



In young male: side-plates with the anterior angle acute; the first 4 joints very 

 stout, the 1st about half as long as the hand and longer than the next 3 ; wrist 

 about one-fourth of the length of the hand ; the front margin of this is convex and 

 naked ; the hind margin has near the base a strong, somewhat everted tooth, above 

 which is an angular sinus ; above this is a flat-topped projection, with a rough edge 

 and submarginal setae, and a small sinus near the base of the dactylus : this has a 

 central projection on the inner side which corresponds with the flat-topped one ; the 

 point reaches slightly beyond the basal tooth ; the outer margin is rough with minute 

 granules, as also is the lower margin of the basal tooth (fig. 39. gn. 1 6" jr.). 



In adult male : the first 4 joints as in the young male, except the 1st joint, which is 

 wider, being half as wide as long. The hand has the base produced backwards in a 

 long pointed spur, above which the hind margin is straight, with a small semicircular 

 sinus near the hinge of the dactylus ; the latter is relatively much longer than in the 

 young male, evenly curved like a sabre, without the central jjrojection, and with a 

 row of 7 or 8 setules along the inner margin (fig. 39. gn. 1 6" adult). 



The 2nd gnathopods are as usual in this family small and alike in both sexes, 

 except that in the female the wrist is rather shorter and in the males subequal to or 

 slightly longer than the hand ; of this the margins are subparallel, the palm obliquely 

 transverse. This limb and the rest of the animal so closely resemble L. (Autonoe) 

 websteri, Sp. Bate, that I refer my readers to Professor G. 0. Sars' excellent 

 description and figures (' Amph. of Norway,' p. 547, plate 194). 



Length 8 millims. 



The resemblance between the first gnathopods of the young and old males of this 

 species and the second gnathopods of the same in Jassa (Podocerus) falcata (Mont.) 

 is very striking (conf. Saks, luc. cit., plate '212, p" S-p* S'). 



Lembos chelatus, n. sp. Plate VI., figs. 40. 



One specimen from north end of Chilaw Paar, 2nd February, 1902. 



Head longer than the first 2 segments. Ocular lobe prominent, angular. Eye 

 roundish, large, dark. 



Third pleon segment rounded behind. 



Upper antennae : peduncle shorter than that of the lower ; 1st joint twice as thick 

 and more than half as long as the 2nd; the 3rd rather shorter than the 2nd; 1st 

 joint of the flagellum almost as long as the last of the peduncle ; appendage very 

 small, 2-jointed, about one-third of the 1st joint of the flagellum. The flagellum 

 was broken at the 2nd joint. 



