82 LIVERPOOL BIOLOGICAL SOCIETY, 
P. falcatus at any age. Indeed the absence of a secondary 
appendage would seem to justify Bruzelius in placing it in 
a separate genus, Jassa of Leach, though it is not easy 
from Leach’s description (in the Trans. Linn. Soc., vol. 
x1., p. 861) to see in what material point this genus differs 
from his Podocerus. 
*Podocerus isopus, n. sp. (P]. XI., figs. 11 to 13). 
Lateral lobe of* the head a sharp right angle. Eyes 
round, centre dark, surrounded by a ring of clear facets. 
ANTENN® subequal, the upper rather the longer, sparsely 
hairy ; the peduncle of the lower and the flagellum of the 
upper being the longer. The upper antenne have the 
second and third joints equal, about five tufts of two hairs 
on the under side of each. The secondary appendage, 
which consists of one long and one minute joint terminated 
by sete, 1s rather more than half as long as the first joint 
of the flagellum. This has five joints, the second and last 
being the shortest; the last is also much thinner than the 
penultimate. The lower antenne have the second joint of 
the peduncle about three-fourths the length of the third ; 
the flagellum is five-jointed, the first jomt nearly as long 
as the second and third together; the fourth joint is 
terminated by two, and the fifth (which is small) by one 
curved spine. 
First GNATHOPODS: Wrist shorter than the hand, 
rounded posteriorly. Hand ovate, palm undefined, with 
many hairs, two strong spines in the middle and one nearer 
the wrist. Finger long, reaching the lower spine, and 
serrated on its distal half, but not as far as the point. 
SECOND GNATHOPODS: Like the first gnathopods, except 
that the margin of the palm in the distal half is somewhat 
sinuate. In the male (?) the hand is about one-third larger 
than in the first pair; in the female the two lhmbs differ 
but little in size. 
