ANCEUS (PRANIZA) FTJSCATA. 197 



DOUBTFUL SPECIES. 



ANCEUS (PRANIZA) FUSCATA. 



Praniza fitscata. JOHNSTON, in Mag. Nat. Hist. v. p. 520, f. 99. WESTWOOD, 



in Ann. Sci. Nat. t. 27, pi. vi. f. 26. WHITE, B. M. 

 Cat. Brit, Crust, p. 74. Pop. Hist. Brit. Crust, p. 241. 



THE 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 antennae 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 



