ISOPODA. 7 



and .second peraeopods, but rather longer, all the joints slender, the third very short, 

 the sixth shorter than the second, but longer than the fourth or fifth, these being 

 subequal, each a little longer than the very slender slightly curved finger. 



The third, fourth, and fifth peraeopods are shorter and stouter than the preceding 

 pairs, with curved spines round the apex of the fifth, and small seta? round that of the 

 sixth joint ; the finger tolerably stout. 



The pleopods, as in the other species and in Heterotanais, have the two narrowly 

 oval subequal rami fringed on the inner margin with long plumose setae, the outer 

 ramus having high up on its outer margin a single adpressed seta. 



The uropods have the inner ramus seven-jointed, the joints carrying numerous setae 

 (the apex of the seventh broken); the outer ramus has two joints, longer than the first 

 two of the inner ramus. 



Length, (5 millims. to 7 millims. For L. minuta and L. forresti the recorded length 

 does not exceed 2'5 millims. 



Locality : Gulf of Manaar. 



Leptochelia lifuensis, Stebbing Plate I. (C). 



1900, Leptochelia lifuensis, Stebbing, in Willey's ' Zool. Results,' pt. 5, p. 616, pi. 64c, d, pi. 65b. 

 1900, Leptochelia, sp., Borradaile, 'Proc. Zool. Soc. London,' p. 797, pi. 51, figs. 2-2c. 



This species has recently been described and figured, and the illustrations here 

 given will, I think, show that the Ceylon specimens are in substantial agreement with 

 those from Lifu. They also show the considerable contrast between the antennas and 

 gnathopods of the male in this species and those in L. mirabdis. The question, 

 however, remains open as to a possible dimorphism in the males, which would diminish 

 or destroy the contrast. 



Specimens in the collection from eight stations are referred to this species. 



Locality, &c. : On baskets of oysters hung to buoy at Galle : Two specimens, 

 female ; one 3 - 35 millims. long with seven large eggs. From pearl oysters, East Cheval 

 Paar, Gulf of Manaar : A male, 2 millims. long ; the two teeth on the thumb of 

 the cheliped rather close together, and on one of the chelipeds not fully formed ; 

 outer ramus of uropod one-jointed, inner five-jointed. Female from same station, 

 2"5 millims. long and agreeing with description in Willey's 'Zoological Results.' 

 From pearl oysters, Gulf of Manaar : Male, 2 - 5 millims. long ; two teeth on thumb 

 of cheliped close together ; outer ramus of uropod one-jointed, very short ; inner 

 ramus imperfect. Female, 3 millims. long. Oft' Mutwal Island, March 19, 1902 : 

 A female, 4 millims. long ; outer ramus of uropod two-jointed, inner six-jointed. 

 Cheval Paar, Gulf of Manaar : A female, 3 millims. long ; outer ramus of uropod 

 one-jointed, inner five-jointed, the last two joints rather long ; the one-jointed ramus 

 very short. Also a female, 1'75 millims. long; outer ramus one-jointed, inner four- 

 jointed. At each of two other points in the Gulf of Manaar a female specimen was 

 taken. By " female " should be understood specimens without any distinctively 

 male characters. 



