240 
GAMMA RID JE. 
AMPHIPODA. GA MM A RIDES. 
NAT A TORI A 
DEXAMINE TENUICORNIS. 
Specific character. First joint of tlie peduncle of the superior antennas 
without a tooth at its extremity. 
Length 4 lines, Rathke ; Brit. Spec. ^ inch. 
Dexamine tenuicornis. Rathke, Beitr. zur Fauna Norwegens, Nov. Act 
xx. p. 77, pi. xliv. fig. 8, 1843. Liljeborg in 
Ofvers. af Kongl. Yet. Akad. Forhandl. p. 22, 
1851. 
The head of this animal, according to Rathke, is not 
produced to a rostrum. The eyes are oblong. The su- 
perior antennae have the first joint of the peduncle short 
and tolerably stout, hut the second is two or three times 
longer than the first ; and the flagellum is very long and 
slender. The inferior antennae have the penultimate 
joint of the peduncle very short, and the ultimate quite 
as long as that of the superior pair. The last pair of 
walking legs have the posterior margin of the thighs 
slightly crenulated, and the fingers of all the legs are pro- 
portionally much longer than in D. spinosa , to which 
species, in all other respects, this animal closely approxi- 
mates. Like Montagu and Milne-Edwards, Rathke drew 
his figure from an animal (taken at Drontheim, on the 
coast of Norway) which had lost the middle tail-piece ; 
