1903. ] IN THE ‘ CHALLENGER’ COLLECTION, (3) 
The eye-stalks, the maxillipeds, and the four posterior pairs of 
the trunk-legs have been broken off. I am convinced that at 
least most, and perhaps all, these appendages possess some organs, 
and the lowest number the species possesses must therefore be 
about 150! 
On the distribution and direction of these organs the following 
remarks may be offered. The four organs on each side of the 
scutum are arranged rather close in a longitudinal row situated 
on the ridge bordering the branchial cavity above (fig. 2a). The 
organ on the clypeus is large: one organ is situated on the 
segment bearing the antennul, and one on the lower surface of 
the head near the lateral margin a little in front of the mandible ; 
these four organs look essentially downwards. The arrangement 
of the organs on the three posterior thoracic segments can be seen 
in figs. 27 and 2d. It is observed that two large organs are 
placed at the lower margin of br. above trl.* and of 67." above 
trl.“ These organs look outwards and downwards, ard the part 
containing the glandular mass &e. behind the lens is somewhat 
protr uding, which produces an aspect as if these organs had been 
inserted on the end of a kind of rather thick, short stalk. The 
remaining organs on the segments mentioned are found on the 
lower surface (fig. 27); those placed at the inner angle of the 
legs are small or very small, while some in the median line are 
large. In fig. 22 fifteen thoracie organs have been drawn; the 
remaining eleven thoracic organs are situated on the anterior 
segments and arranged in a rather similar way. The four organs 
on the lower surface of each squama of the antenna are arranged 
for some distance In a row; two of them are seen through the 
squama in fig. 2c, The mandible (fig. 2¢) has one organ below 
at the antero-inferior margin near the insertion of the palp; 
another organ is seen on the lower surface of the first joint of the 
palp near its distal end. The first maxilliped (fig. 2,/) has on 
the upper side one organ just at the origin of the exopod, and one 
on the lower side of the following joint of the endopod; the first- 
named organ looks forwards and a little inwards (fig. 2 g), and 
the upper margin above it is produced nearly as a lamella, over- 
lapping the major part of the lens when seen from above (figs. 2 9 
& 2). Of the organs on the outer—in the natural position of 
the appendage in reality the lower—surface of mxp.” (fig. 2), 
that at the base of the third joint is very small and the others 
large; the organ on the first joint looks essentially downwards, 
and is “stalked,” as the above-described organs near the lower 
margin of the posterior branchie. Of the three organs on trl.’, 
two are placed on the inner side of the long fourth joint, one near 
the base and the other near the distal end; the third organ is 
situated on the anterior side near its end. Hach of the five 
anterior abdominal segments has a large organ on the oe eh 
of the anterior margin of the Jateral plate (figs. 2d & 27%); 
looks forwards and somewhat downwards, besides comietiies a 
little outwards. Hach of the two anterior segments has besides 
