Pemphix, Glyphea, and Areosternus. 145 
The inner antenne, placed upon a jointed peduncle, are 
composed of two slender multiarticulate and elongated fla- 
gella; the peduncle seems to me to be composed of three 
joints of a cylindrical form. 
The outer antenne are much stouter and much longer than 
the inner ones. Their peduncle is composed of two joints, of 
which the posterior is adorned with several longitudinal series 
of small tubercles, which, according to M. Oppel, are slender 
spines. ‘This basal portion of the antenna bears a very long 
multiarticulate filament. . . . Above the base of the external 
antenne there is a pointed movable lamina or protective 
scale shorter than the peduncle of the antenne. It appears 
to me that the surface of this movable scale is pertectly 
smooth. 
The ocular peduncles are very long and broad; they do 
not seem to be cylindrical as usual, but have the appearance 
of being almost lamellar. According to M. Oppel the extre- 
mity of these peduncles is almost always lost; but the greater 
part generally exists in its original position and form, although 
flattened in a certain direction. 
None of the specimens at my disposal present any traces 
of the jaw-feet ; consequently I cannot give a description of 
them; but M. Oppel says that these organs consist of several 
segments, and that they are digitiform and of a moderate 
length, equal to that of the movable scale of the outer an- 
tenne. 
The legs of the first pair are large and broad and garnished 
with tubercles and teeth, which are generally situated upon 
longitudinal lines; their penultimate joint especially is toothed 
delow ; the series is composed of about ten sharp teeth, one 
of which is much larger than the others. These anterior legs 
terminate in a single pointed and slightly curved finger. 
This finger also presents some small tubercles, arranged in 
rows, which give it the aspect of being adorned with promi- 
nent beaded lines. It may be, however, that these tubercles 
are not truly tubercles, but teeth or spines depressed by the 
pressure undergone by the animal in the beds of limestone 
which have preserved these remains for us. 
The succeeding legs are more slender; and their surface is 
smooth or presents only a few isolated tubercles. They ter- 
minate in a slender and pointed claw; all the five pairs of 
legs are consequently monodactyle. 
In general the size of these Crustaceans is small; they 
rarely attain a length of more than 1} to 2 inches. 
On comparing our description with the diagnosis of the 
species established by M. Oppel, it is not difficult to recog- 
Ann. & Mag. N. Hist. Ser. 5. Vol. x. 10 
