PHRYXUS. 233 
immersed in spirits), hence the body is nearly parallel at 
the sides. 
Each segment bears a pair of rather strong legs, formed 
for walking, terminated by asemi-ovate hand, with a sharp 
hook-like finger. 
The pleon forms a subconic-ovate mass, with all the 
segments closely soldered together, indicated more or less 
distinctly by lateral incisions. 
The full-grown female is a large inert nearly globular 
mass, with the segments scarcely indicated by depressions, 
and with a series of wide and broad ovigerous plates, 
which fold backwards and envelop the upper-side of the 
body. 
The cephalon is furnished with very short antenne, 
resembling those of the male in structure, and the mouth 
forms a large conical tubercle rounded at the extremity. 
The pereiopoda are inclined towards the back, and 
formed as in the female Bopyri, with the articulations 
much less distinct than in the males, and the propoda are 
small and weak, with a small curved obtuse dactylos. 
These limbs are irregular in size on the two sides of the 
body, some of them being even obsolete on one or other 
side. 
The pleon is composed of small joints, furnished with 
elongated lobes or plates for breathing, varying in number 
and size in the different species, the terminal joint being 
small and bifid in the typical species. 
We have added to the genus several species, the females 
of which possess more or less elongated appendages to 
the segments of the tail, but differ from the typical 
species in having the body in the same sex symmetrical, 
or nearly so; on this account one of these species has 
been formed by M. Hesse into the genus Pleurocrypta, 
which we have not thought necessary to retain. 
