110 H. J. HANSEN. 
rami of plp.4 naked or with a few very short terminal sete. 
Abdomen terminates in a notch (sometimes visible only from 
below). Marsupial lamella overlap each other somewhat at 
the mesial line. 
(b) Section Monolistrini.—Body rather vaulted ; thorax 
and abdomen not expanded laterally, without any row of 
short hairs on the lateral margin. Hyes wanting. The two 
proximal joints of the antennule fitted in excavations on the 
head, not expanded plate-like in front. Mandibles with the 
masticatory process well developed. First pair of legs simple ; 
second pair in the male terminating in a prehensile hand. 
Endp. of plp.! very narrow, more than three times longer 
than broad. Both rami of plp.? and of the following pairs 
without marginal sete ; exp. of plp.* unjointed; endp. of all 
three pairs opaque, respiratory, while exp. is vitreous and at 
least not so well adapted for respiration. Abdomen without 
notch, posteriorly broadly rounded. Marsupial lamelle very 
‘large; the brood in the marsupium itself. 
(c) Section Cassidinini.—Body much or exceedingly 
depressed ; thorax considerably or strongly expanded ; 
margin of thorax, anterior part of abdomen, uropods and 
sometimes the two proximal joints of antennule constituting 
a nearly continuous border ciliated with a less or more con- 
spicuous rim of short protruding hairs. Hyes well developed. 
The two proximal joints of the antennule with the anterior 
part protruding, visible from above in at least almost their 
whole length, frequently much expanded in front, depressed. 
Mandibles with masticatory process well developed. Anterior 
pairs of legs without prehensile band. Endp. of plp.' at least 
somewhat longer than broad, sometimes very narrow. Both 
rami of plp.° with several plumose sete on the terminal 
margin ; exp. unjointed or two-jointed. Both rami of plp.* 
and plp.® without sete, subsimilar in aspect, respiratory. 
Posterior margin of abdomen short; a real notch always 
wanting. Marsupial lamelle wanting; the brood in a 
chamber formed by two external pouches (see p. 80). 
(d) Section Ancinini.—Body depressed ; thorax some- 
—_—_— — 
