169 
This species at first sight may easily be mistaken for Ladzdocera pavo Giesbrecht, of 
which only the female is known. The genital segment of the female of Ladzdocera bataviae is 
without the large protuberance that is so conspicuous in Laézdocera pavo. The fifth pairs of feet 
of the two females are also rather different in shape. 
Occurrence. — One hundred and fifty-six females and thirty males were obtained 
from the plankton collected at the following stations. 
Stat. 16, 29 specimens. — Stat. 66, 22 specimens. — Stat. 71, 60 specimens. — Stat. 81, 
26 specimens. — Stat. 98, 22 specimens. — Stat. 282, 27 specimens. 
7. Labidocera madurae nov. sp. Plate L, figs. 9—16. 
Female — length 2,5 mm. 
Seen from above, the body appears elongate ovate, and rather narrow. The cephalic 
segment is without side hooks, and the forehead is boldly rounded. The last thoracic segment 
is symmetrical. The lateral margins are produced posteriorly into pointed processes. The basal 
part of the rostrum is wide. There is practically no excavation. The rami are long and are 
distinctly articulated to the base (Plate L, fig. 10). 
The abdomen is short. It is composed of two segments. The combined length of the 
abdomen and furca is contained five times in the total length of the cephalothorax, from the 
frontal margin to the distal end of the last thoracic segment. The genital segment is mode- 
rately large. It is quite asymmetrical. The middle of the right side is considerably inflated. 
The anal segment is very short. The furcal joints are symmetrical. They are rather longer 
than broad (Plate L, fig. 9). 
The antennules are composed of twenty-three joints and extend to the end of the abdomen. 
The antennae, mandibles, maxillae and maxillipedes are similar to those of the previous 
species. The apical portion of the second pair of maxillipedes is composed of four joints. 
The endopodites of the four pairs of swimming feet are two-jointed. The exopodites 
are three-jointed. 
The fifth pair of feet is nearly symmetrical. The exopodite is furnished with two outer 
marginal spines. The apex terminates in three subequal spines. The apex of the endopodite 
iemnotbiturcate (Plate Ly fig. 12). 
Male — length 1,9 mm. 
The male resembles the female except that the abdomen is composed of five segments. 
The fourth and fifth segments are much shorter than any of the others (Plate L, fig. 14). 
The middle joints of the right antennule are only slightly swollen. The upper margin of 
_the proximal hinge joint and of the distal hinge joint is fringed with fine teeth (Plate L, fig. 15). 
The thumb-like process on the proximal end of the outer margin of the first joint of 
the right exopodite of the fifth pair of feet, is comparatively short and curved. There is no 
tooth at the base of the process as in Ladidocera bataviae. The palm is simple. The claw-like 
joint is long and narrow. The apical joint of the left exopodite is elongate ovate. It is twice 
as long as broad. The outer margin is furnished with one spine, and the apex bears three 
spines. The inner margin has a pad of fine hairs. 
169 
SIBOGA-EXPEDITIE XXIX@. 22 
