500 
CRUSTACEA. 
granular ; body arcuated and gibbous ; tail having six segments, 
the last one triangular and short; and with seven pairs of feet. 
Armadillo vulgaris. — The Common Armadillo. 
Plate XCIV. fig. 6. 
Ash-coloured, with the margin of the segments paler. Inha¬ 
bits Europe, under stones. 
ORDER VI_LAPHYROPODA. 
Head not distinct from the trunk; eyes compound and ses¬ 
sile ; shell of one or two pieces, and varying in size; jaws un¬ 
provided with branchiae, and the mandibles without palpi; feet 
variable in number, simple, branched, or formed of hairy lamina}, 
fitted for swimming; these are considered the organs of respi¬ 
ration. 
TRIBE I.-UNIVALVIA. 
Shell consisting of one piece, and leaving the greater part of 
the body uncovered.—The genera are, 1. Cyclops. 
TRIBE II.-OSTRACODA. 
Shell either folded in two, or united in the form of a bivalve 
shell by a hinge, and inclosing the body.—Its genera are, 2. Po¬ 
lyphemus ; 3. Daphnia; 4. Lynceus; 5. Cypris; 6. Cythe- 
rina. 
ORDER VII—PHYLLOPODA. 
Head not distinct from the trunk ; eyes approximate, smooth, 
and sessile ; antenna} very short; a crustaceous shield, free pos¬ 
teriorly ; having two corneous mandibles without palpi; feet of 
the first pair oar-shaped, the others fitted for swimming, and 
consisting of sixty pairs. 
TRIBE I.-ASPIDIPIIORA. 
Eyes not placed on peduncles.—It has two genera: 1. Lim- 
nadia; 2. Apus. 
