IROPODA. 5 



The first gnathopods are remarkably stout, the fifth joint being a little longer than 

 broad, but almost quadrate, the sixth subequal to it in length but less broad, with 

 the trunk a little longer than its rather broad thumb. The thumb has a slightly 

 serrate inner margin, ends in a small tooth, and is furnished with a row of three setse 

 on the surface and one seta on the outer margin. The finger is more slender, with 

 undulating inner margin. 



The second gnathopods are very slender, with second joint scarcely longer than the 

 fifth or sixth, which are subequal ; the fourth joint is much shorter than these, but a 

 little longer than the third ; the slender curved finger is about as long as the sixth 

 joint. 



The pera?opods are small, with the second joint decidedly longer and, especially in 

 the last three pairs, broader than any of the other joints ; the fourth and fifth joints 

 differ little in length, each being shorter than the sixth, which is also considerably 

 longer than the finger. 



The pleopods resemble those of Leptocheha, having the inner margin of each oval 

 ramus fringed with setse, and the outer margin of the outer ramus carrying one seta 

 placed high up. 



The uropods have a six-jointed inner ramus, of which the first joint is the stoutest 

 and the last the longest, carrying at its apex one seta as long as the ramus and one 

 or two shorter setae. The outer ramus, which is also tipped with a long and a short 

 seta, is composed of two joints, the first very short, the second more than twice as 

 long, the two together rather longer than the first joint of the inner ramus. 



Length : Of four specimens the largest measured a little over 2 millims., and the 

 smallest a little over 1 millim. in length. 



Locality : Gulf of Manaar. 



The specific name refers to the remarkable stoutness of the first antennae, which 



appears to distinguish the species from any hitherto described in this genus or 



Leptochelia. 



Leptochelia, Dana. 



1849, Leptochelia, Dana, ' Amer. J. Rci.,' ser. 2, vol. 8, p. 425. 



1900, Leptochelia, Stebbing, in Willey's 'Zoological Results,' pt. 5, p. 614. 



1900, Leptochelia, Borradaile, 'Proc. Zool. Roc.,' London, p. 797. 



1902, Leptochelia, H. F. Moore, 'Bull. U.R. Fish Conim.,' vol. 20 (for 1900), p. 165. 



1902, Leptochelia, H. Richardson, ' Trans. Connecticut Ac. Rci.,' vol. 11, p. 279. 



For a fuller synonymy of this genus down to 1900, Willey's ' Zoological Results' 

 may be consulted. Mr. H. F. Moore's recently established Porto Rican species, 

 L. incerta, is hesitatingly referred by Miss H. Richardson to L. dubia (Kroyer). 

 The undesigned coincidence of dubiety and uncertainty in the specific names with 

 the note of interrogation in the reference very appropriately marks the position of the 

 systematist in dealing with this genus. When the generic name is justified by the 

 presence of the extraordinarily elongated first gnathopods of the mature male, the 

 standing ground is tolerably firm. This applies to four species, but in those leaves 



