GEBIA. 
97 
Gen. 33. GEBIA, Leach. 
Carapace with a triangular beak. Outer antennae with- 
out a scale at their base. Outer jaw-feet pediform. Second 
pair of legs with one toe ; all the legs indeed, except the 
first, have but one toe. Abdomen long and much narrower 
at the base than towards the middle; it is depressed and 
ends in a large fin, of which the four side-plates are foliaceous 
and very wide. Eirst ring of abdomen with a pair of very 
small filiform appendages; the four succeeding segments 
with three pairs of false swimming-legs. 
Gebia stellata, Mont. sp. Mud-horer. (Plate VII. 
fig. 3.)— Colour yellowish-white, covered with minute stel- 
lated orange spots. Eront of carapace roughened with 
minute spines arranged in longitudinal rows. Length 
nearly two inches. 
Eirst found by Colonel Montagu at Kingsbridge, where 
it seemed to inhabit the subterraneous passages made by 
Solen vagina; but there is no doubt that, like some others 
of its family, it is a great borer itself. 
Gebia deltuba, Leach. — A much larger species than 
the preceding; with the back of the abdomen membrana^ 
ceous, outer lamella of the tail slightly rounded and dilated 
H 
