GEBIA. 
CANCER (Astacus). Montagu . 
GEBIA. Leach. 
Antenna? in eadem fere Iinea horizontali insert® : 
interiores biarticulat® ; articulo primo secundo breviore : pedunculus elongatus basi 
externe dilatatus : set® du® ; superiore compressa. 
exteriores triarticulat® ; articulo secundo longiore : seta Iongissima ; articulis 
subelongatis. 
Palpi pediformcs 5-articulati infra pilosi. 
Pedes decern : par anticum majus ®quale didactylum ; index abbreviatus : paria alia compressa 
pilosa ; ugues simplices. 
Abdomen 6-articulatum ; articulis transversis. 
Cauda pentaphylla ; processus lamelliformes lati ; lateralibus costatis. 
Antenn® inserted nearly in the same horizontal line : inner ones two-jointed ; the first joint 
shorter than the second ; the peduncles elongate, their base externally dilated : set® two, the upper 
one compressed. External antenn® three-jointed, the second joint longest; the seta very long 
composed of subelongate joints. Pedipalpes five-jointed, hairy beneath. Legs ten ; anterior 
paix largest, ecpial, didactyle, with the finger short: other pairs compressed, hairy; claws 
simple. Abdomen composed of seven transverse joints. Tail with five broad lamell®; the 
lateral ones ribbed. 
All the species as indicated by the generic name, live beneath the earth, and are only to"be 
obtained by digging in the mud at very low tides. 
Gebia is probably confined to the European Seas ; it has been confounded with the Indian 
Genus Thalassina of Latreille, from which it differs in every character. 
