196 
HISTORY OF BRITISH CRUSTACEA. 
Falmouth (Mr. Webster). 
Gen. 92. EBICHTHONIUS, Milne-Edwards. 
Lower antenna not pediform. Thumb developed on the 
carpus of the second jaw-foot. Posterior false feet single 
branched, ending in hooks. Telson furnished with curved 
spines. 
Erichthonius difformis.— T humb on the second jaw- 
foot two-pointed. 
Found at Swansea and Plymouth by Mr. Spence Bate. 
Gen. 93. SIPHONCECETUS, Kroger* 
Lower antennae subpediform, longer than the upper. 
First and second jaw-feet prehensile. Posterior false feet 
single branched, terminating in hooks. Telson furnished 
with teeth or hooks. The five pairs of legs ending in curved 
spines. 
Siphoncecetus Kroyeranus, Spence Bate. — Upper an- 
tenna short ; terminal joint of front legs styliform and with- 
out a curve. 
* So named by the Danish naturalist from the animal living in a siphon, 
or tube, which it constructs of different materials. 
