No. 1746. 



.1 NEW AMI'llll'Ol) lh'OM \1RCI\I\ EMBODY. 



303 



(4) Second gnathopods (fig. 11): Palm straight or slightly concave, 

 possessing a small angular prominence at the posterior extremity, 

 the inner margin of this prominence together with the remaining 



margin of the palm closely set with minute teeth as in gnal hopod one ; 

 posterior margin of propodus destitute of spines and hairs. 



(5) Third, fourth, and fifth perseopods destitute of spines and 

 serrations. 



((>) Uropod one, shorter, not reaching backward to the cud of 

 second uropod. 



(7) Uropod three (fig. 

 12), with three spines^ 

 •two short ones at the 

 apex and one long one 

 on the outer margin of 

 the outer ramus. 



(8) Telson (fig. 10) 

 with lateral margins very 

 convex, not quite so long 

 as in the adult but dis- 

 tinctly longer than pe- 

 duncle of third uropod: 

 emargination not quite 

 so deep as in adult. The 

 apex of each lobe is armed 

 with a single spine while 

 the mid-dorsal region of 

 the telson is minus spines. 



(9) Eyes brownish in 

 life. 



Differences betwi < n 

 young of Eucrangonyx 

 gracilis and E. serratus. — 

 The following differences 

 between the young of 

 these two species were F "' s - s '-'• E - serratus (young). wn\ 



1 . 9, VNTENNA 2, X 32 DIAM.; 10, GNATHOPOD I. ■ L59 DIAM.; 11 



lound to be constant 111 gnathopod 2, X 159 diam.; 12, uropod 3, X 159 diam. 



all specimens examined : 



(1) Young E. serratus are 25 per cent longer than E. gracilis. 



(2) The propodus of first gnathopod in E. serratus is broader 

 distally, the palm forming a, prominent angle of 45° or less with the 

 posterior margin, which latter is decidedly concave. In I:', gracilis 

 (fig. 13), the junction of these two margins is well rounded. 



(3) The palm in gnathopod two is decidedly more oblique in E. S( r- 

 ratus, and as noted previously possesses an angular prominence at the 



