210 
CLASS CRUSTACEA. 
sexes, and the last articulation but one, or the hand, is ovoid. 
( Cancer rubricatus , Montagu.) 
Pherusa, Leach , 
Which do not differ from Ampithoe, except that the hands of 
the claws are filiform. ( Pherusa fucicola , Leach.) 
Sometimes the peduncle of the antennae is composed of 
only tw T o articulations — (the third, from its smallness, being 
confounded with those of the stem, or forming that of its 
base) ; — the superior are longer than the inferior ; all the feet 
are simple, or without pincers. Such are 
Dexamine, Leach . 
In those, the talon, or mobile finger of the two pincers, is 
biarticulate ; the antennae are of equal length. ( Cancer gam - 
marus spinosus , Montag.) 
Leucothoe, Leach , 
Have the antennae short, and their peduncle with two 
articulations ; the four anterior feet strongly terminated in a 
pincer, the talons of the two anterior biarticulate ; those of 
the second pair with a single articulation and long. ( Cancer 
articulosus , Montagu.) 
Cerapus, Say., 
Whose antennae are large, with the peduncle in the upper of 
three, in the lower of four articulations ; the two anterior feet 
are small, with a talon of a single articulation ; and the two 
following terminate in a large triangular hand, smooth, den- 
ticulated, with the talon biarticulate. ( Cerapus tubula- 
ris , Say.) 
Sometimes the low T er antennae, much larger than the upper, 
and whose stem is composed at most of four articulations, 
have the form of feet, and appear to serve, at least occasionally, 
as organs of prehension. 
