398 A HISTORY OF RECENT CRUSTACEA 
appeared to be two males fixed one on each side of the 
female. 
Family 3.—Dajide. 
They are parasitic on Schizopoda. In the adult female 
the trunk-feet are only five pairs, and the sides of the 
body are folded ventrally so as to form a chief part of the 
marsupium, only the last pair of marsupial lamelle re- 
taining an important function in closing the pouch from 
behind. 
Dajus, Kroyer, 1846. The animals of this genus are 
attached on the ventral side of the host. In the female, 
the first antenne are tuberculiform, three-jointed, the two 
terminal joints minute; the second antennz have a large 
basal joint, succeeded by about eight slender joints. The 
spoon-shaped ends of the mandibles can be projected 
through an opening between the upper and lower lips. 
Both pairs of maxille are rudimentary, tubercular. The 
maxillipeds are two-jointed, with an epipod, but no 
exopod. Between them is developed a triangular opercu- 
liform plate. The sixth and seventh pairs of feet disap- 
pear ; the preceding five are all nearly alike. The imbricated 
first four pairs of marsupial plates form a movable lid to 
the front opening of the marsupium. ‘The large fifth pair 
close it behind, in combination with the inner branches 
of the first pleopods. The remaining pleopods are rudi- 
mentary, the second, third, and fourth being bilobed, but 
the fifth consisting of a pair of simple tubercles. The 
uropods also are simple, but a little more elongate. The 
adult male is placed between the first pleopods of the 
female: It has the first segment of the perzon fused 
with the head; the pleon is a single piece without pleo- 
pods. The first antennz are four-jointed, the second 
eleven-jointed. The mouth-organs consist of strong 
mandibles and tubercular first maxille and maxillipeds. 
The male, in the earlier ‘cryptoniscian stage,’ has seven 
distinct segments in the pereon and six in the pleon, with 
appendages to each, those of the pleon being all biramous, 
with the branches set wide apart on the broad peduncle. 
