152 Part III.—Twenty-first Annual Report 
endopodite, these cilia are only on the dorsal half of the surface. This is 
the exposed surface of the third maxillipede. The upper surface is close 
up against the second maxillipede, and on it (the upper surface) there 
are none of these cilia. Generally over the body of the crab of this 
stage the external surfaces are covered with these minute cilia, except 
where two surfaces interact on one another, e.g. anterior surface of 
chela on the epimeron. In the third maxillipede they are not confined 
to the endopodite, but are also on the basal joint, and on the part of the 
first joint of the exopodite which is exposed beyond the endopodite. 
The two sketches together show all the hairs and bristles which 
are found on the appendage. A number of these, however, appear 
in both drawings. They are those on the superior edge of the second 
and third joints, and the short hairs on the edge of the first joint. 
The inner edge of the first joint of the endopodite is now minutely 
crenate: the exact number of lobes is shown in the sketch. It is 
furnished with a row of short hairs, all situated on the outer surface. 
On the surface of the joint there are externally a number of plumose 
hairs, and on the internal surface a number of hairs of which only 
one was made out to be provided with cilia (two). 
The second joint has a notched superior edge, and on its inner side it 
is hollowed out to receive the third joint ; the hinge between the two 
gives a free movement antero-posteriorly. 
The number of serrated bristles on the third, fourth, and fifth 
joints has increased. They are all on the superior surface, 7.¢. next the 
second maxillipede. 
Tue Peretopops, per, Plates ix., x., and xi. 
I, (Side view, Figs. 69 and 76 ; ventral view, Fig. 85). The pereiopods 
in the first Zoéa stage are hollow buds packed closely together on each 
side of the oval-shaped rudimentary sternum (th). They are all more 
or less club-shaped, the first pereiopod being distinguished from the 
others by its greater size and swollen end. The remaining buds resemble 
one another much. They are arranged round the sternum, and on 
account of the oval form of the latter the fifth pereiopod is brought 
round nearer the median line than the others. It is in this way often 
hid when the buds are examined in side view. 
The buds of the branchiz (47, Fig. 69) are seen in this stage. There 
is a large hollow outgrowth from the outer side of the first pereiopod, 
and two small similar buds from the outer sides of the second and third 
pereiopods respectively. The hollow interior of the bud of the branchia 
is continuous with that of the pereiopod bud : this is seen better in the 
later stages. 
The buds of the pereiopods show no segmentation. 
The sternum of that part of the thorax is rudimentary like the limbs 
that pertain to it, and it separates easily off as an oval disc: it shows 
some traces of segmentation. 
The gut in this part of the Zoéa is interesting. The gut is in the 
adult straight, and so it is in the Zoéa except at this part, where it is 
convoluted (Fig. 162, Plate xii.). The convolutions allow for the 
gradual expansion of this region with its growth during the Zoéa period, 
without any extra growth having to take place in the gut which is 
functioning. 
II. (Figs. 73 and 84). The bud of the first pereiopod is now bifid. 
The hollow structure of the pereiopods is well seen in Fig. 73. They 
have thick walls. 
