ANCEUS (PRANIZA) FUSCATA. 197 
DOU rr UL Ss PH CT Es. 
ANCEUS (PRANIZA) FUSCATA. 
Praniza fuscata. JoHNsToN, in Mag. Nat. Hist. v. p. 520, f. 99. Werstwoon, 
in Ann. Sci. Nat. t. 27, pl. vi. f. 26. Wuurrn, B. M. 
Cat. Brit. Crust. p. 74. Pop. Hist. Brit. Crust. p, 241. 
Tue late Dr. Johnston indicated, as a distinct species 
of Praniza, certain individuals evidently in an imma- 
ture condition, which he had taken on the Berwickshire 
coast, and which, in the present state of our knowledge 
of the species of this genus, it is impossible to assign 
to the real mature representatives. They are described 
as being two lines long, with the cephalon, two anterior 
segments of the pereion, pleon, and legs colourless 
and transparent, the eyes black, the large terminal con- 
solidated mass of the pereion reddish-brown; the ce- 
phalon is pointed, the antennz lateral, four-jointed, 
the last joint long and divided by many transverse lines ; 
the eyes lateral, large, and compound, like those of 
insects. The pereion (which Johnston called the ab- 
domen) is ovate, with a translucent edge and three pairs 
of legs. The pleon is straight, six-jointed, the joints 
equal, distinct, armed on the underside with four 
rows of compressed fins, ciliated on the margins, and 
the ultimate joint terminated besides with four similar 
appendages, and a triangular process (the telson) between 
them. The large pereion is in some specimens smooth 
