410 Mr. C. Spence Bate on two new Crustacea. 
they succeed each other posteriorly, and the last having the 
coxal plate fused with it and produced posteriorly to a strong 
point. The somites of the pleon 
are dorsally crowned with small 
tooth-like points, which become 
less conspicuous in succession pos- 
teriorly. The posterior and post- 
inferior angles of each somite are 
produced to sharp spine-like 
points. The fifth somite 1s longer 
than the four preceding, and the 
dorsal surface is serrated in the 
median line; the sides are flanked 
by a strong ridge; and the inferior 
margin is entire, but produced 
posteriorly to a sharp point. The 
sixth somite is cylindrical, and not 
produced posteriorly beyond the 
point where it articulates with the 
telson. The telson is sharp, styli- 
form, and moderately long, being 
nearly as long as the two prece- 
ding somites. The styliform uro- 
poda have the first jomt half as 
long again as the telson, and sup- 
porting two branches, of which the 
inner is as long again as the outer 
and slightly fringed with hairs. 
The first pair of antenne are 
about as long again as the rostral 
processes of the carapace. The 
second antenne in the male animal 
are nearly as long as the animal. 
The first joint of the peduncle is 
not conspicuous; the second does 
not reach as far as the extremity 
of the rostral processes; and the 
third reaches as far as the extre- 
mity of the first pair of antenna ; 
it is broad at the base and gradu- 
ally tapers to the distal extre- 
mity. 
Most of the other appendages 
are so damaged that it is difficult Dvastylis bimarginatus, n. sp. 
to determine any specific characters 
in them, except the caudal pair, which have the terminal 

