222 
marsupial chambers are strongly produced behind in acute lobes 
reaching beyond the abdomen, and along the median line they 
nearly reach each other or even the right overlaps the left a little. 
Head and the ventral part of the five anterior segments with their 
legs constitute together a small portion well marked off from the 
expanded lateral part filled with eggs; anteriorly the cephalic 
part is rounded, with the mouth considerably behind the front 
margin. Dorsal side of the thorax considerably vaulted, scarcely 
exhibiting transverse folds as indications of segments; abdomen in 
ovigerous specimens not visible from below but from the side, with 
the three or four posterior segments marked off and terminating 
in oblong uropods not sét off from the last segment. The anten- 
nulæ are unjointed, the antennæ 4-jointed, at least sometimes 
scarcely discernible in the adults. The mouth-protuberance short. 
Maxillipeds (mæp on Pl. III, figs. Ze and 3f) with their ante- 
rior free part formed as a very oblong-oval, somewhat curved plate 
which is turned strongly outwards and hidden within the invagi- 
nation, while the large epipodial lamella (ep) is visible from below 
between the thoracic legs. Marsupial plates (11) of first pair of 
thoracic legs very large, with their inner part visible from below 
between the thoracic legs, while their major portion is hidden 
within the invagination.. The marsupial plates of second pair of 
legs (12) rudimentary, those of third pair somewhat small and 
directed backwards (13), while the plates of fourth and fifth pairs 
are directed backwards, long, narrowing backwards, but not marked 
off outwards. — Length 3/5 mm. 
Younger Females. — In a subadult female without eggs 
(Pl. III, figs. 33c—3 d) the lateral expansions of the body are 
already large, but their inner margin still a little removed from 
the median line and not overlapping the male (m), while in adults 
brief deseription, but as to its real contents only little is altered er 
added. Prof. Gilson has described the first larval stage which is 
unknown to me, and some very young stages of the female; as to these 
and other particulars the reader is referred to his very elaborats paper. 
