UROTHOE BREVICORNIS. 
199 
feature in U. mcirinus. The hands of the first two pairs 
of legs are rather more slender, and have not the antero- 
inferior margin of the wrist anteriorly produced, and 
the hands have the palms more oblique, and still more 
imperfectly defined. The third and fourth pairs of 
legs, although armed with spines, are not so strong as 
those of U, marinus . The dilated thigh of the fifth 
pair of legs is almost triangular, and has not the pos- 
terior margin crenulated; the plumose hairs adorning 
the posterior margin are reduced to a single tuft on the 
carpus ; the finger is very long, and has the anterior 
margin entire, or imperfectly serrated. The last two 
pairs are nearly uniform, and have the posterior margins 
of the thighs imperfectly crenulated, and the fingers are 
straight and styliform. The caudal appendages differ 
from those of U. marinus in the greater length of the 
base, and in the branches of the antepenultimate pair 
reaching beyond those of the penultimate. The branches 
of the ultimate are also shorter, and not fringed with 
hairs. The middle tail-piece is long, naked, and obtuse. 
This species was sent to us by our kind friend, Mr. 
M. Webster, from Tenby, where he took it with the 
dredge. 
