DEXAMINE VEDLOMENSIS. 
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. 
R 
2 
