196 HISTORY OF BRITISH CRUSTACEA. 



Falmouth (Mr. Webster) . 



Gen. 92. ERICHTHONIUS, 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. — Thumb on the second jaw- 

 foot two-pointed. 



Found at Swansea and Plymouth by Mr. Spence Bate. 



Gen. 93. SIPHONCECETUS, Kroyer* 

 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. 



Siphonozcetus 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. 



