DEXAMINE VEDLOMENSTS. 243 



guished by a very deep dorsal sinus, the anterior wall 

 of which projects backwards, in the form of a small 

 tooth. The eyes are oval. The superior antennae have 

 the first joint of the peduncle nearly as long as the 

 head, and armed at the infero-distal extremity with an 

 acute tooth ; the second joint is more slender than the 

 first, and about half as long again : the flagellum is long 

 and slender. The inferior antennae have the penultimate 

 joint of the peduncle reaching as far as the middle of 

 the second joint of the peduncle of the superior; the 

 ultimate joint is as long as the preceding, and therefore 

 reaches considerably beyond the extremity of the ped- 

 uncle of the superior; the flagellum is slender, and 

 reaches further than that of the superior pair. In other 

 respects this species differs little from D. spinosa. 



This species was taken by the Rev. A. M. Norman, 

 (in whose collection the only specimen is preserved,) in 

 the Vedlom Voe in the Shetlands. 



n 2 



