240 
HISTORY OF BRITISH CRUSTACEA. 
pair to each segment of the thorax, and three pairs to the 
abdomen ; while the jointed tail is armed beneath, and at 
its end, with foliaceous appendages, that appear to be both 
motive and respiratory organs. - * The head is small and 
rounded, and the mandibles are concealed. 
Praniza c^ruleata, Montagu, sp. Bluish Braniza. 
(Plate XIII. fig. 4.) — Abdominal segments blue; last seg- 
ment of abdomen bifurcate at the top ; a line and a half in 
length. 
Hab. Shores of Devon (Montagu, Linn. Trans, xi. 15, 
t. 4, fig. 2) ; the male is found usually on rocks, while the 
female seems to be generally fixed to the branchiae of dif- 
ferent fishes. 
Montagu, Otto, and Westwood, from finding the Pranizce 
amongst parasitic Crustacea, etc., conclude that like the 
Caligi they are found on fish. M. Audouinf mentions that 
he and Edwards met with them amongst small Crustacea on 
the shore of the English Channel, at low w T ater. They were 
free, and walked about among the seaweeds with their legs. 
They employ their abdominal appendages in swimming, 
and have the pieces of their mouths constantly in a state 
* Johnston, Mag. Nat. Hist. v. 521. 
+ Note to Westwood’s paper, Ann. Sc. Nat. xxvii. p. 327. 
