292 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
the outer antenne, concealed, in a dorsal view, by the much 
longer antennal scales, are a little shorter than the eyes; the 
naked flagella are nearly twice and a half as long as the cepha- 
lothorax, the rostrum included. 
The strongly compressed postabdomen is nearly three times as 
long as the cephalothorax; the slightly impressed parts of its 
outer surface are pubescent, like those of the cephalothorax, 
whereas the slightly elevated parts are smooth and glabrous. 
The first three or anterior segments are smooth and glabrous on 
the dorsal median line; they are not at all carinate, though a 
longitudinal pubescent impression is observed on each side of the 
smooth and glabrous dorsal median line. The lateral surfaces of 
the postabdominal segments present other and similar impres- 
sions, some of which are longitudinal or oblique, whereas others 
are transverse. The fourth segment is slightly dorsally cari- 
nate, but its carina is rather obtuse; the fifth and sixth seg- 
ments, however, are sharply keeled, and the carina of the sixth 
segment terminates posteriorly in a short acute angle or tooth, 
whereas the carine of the fourth and of the fifth segments are 
not at all toothed posteriorly. The posterior borders of the 
postabdominal segments are entire and smooth; those of the first 
and second segments present a small notch on each side, those 
of the fourth and of the fifth a similar somewhat deeper notch. 
The strongly compressed sixth segment is marked on each side 
with four longitudinal impressions. The terminal segment is 
scarcely longer than the sixth, narrow and acuminate ; it is dor- 
sally canaliculated along its whole length, and its lateral margins, 
which are fringed with some hairs, are quite unarmed and not spini- 
ferous ; in P. Richtersii the lateral margins are each armed with 
three mobile spines, and the telson is dorsally canaliculated only 
in its proximal half. 
The outer maxillipeds have the same length in the male and 
female; they are rather short and are quite as long as the ros- 
trum, and somewhat shorter than the peduncles of the external 
antenne. 
The anterior legs reach only to the distal end of the penultimate 
joint of the external maxillipeds and of the antennal peduncle ; 
the second joint of these legs, the basipodite, is armed with a 
spine, but the third is unarmed. The hands are a little shorter 
than the carpopodites, and the fingers are a little longer than 
the palm. The legs of the second pair are a little longer than 
