of the Fishery Board for Scotland. 151 
future epipodite, the large proximal swelling represents two branchie. 
No segmentation into joints was seen. The limb is a hollow process, 
and the swellings are also hollow. 
II. (Fig. 84). Three swellings are now to be made out on the outer 
side of the growing bud. The upper represents the epipodite, the other 
two, branchize. 
ITI. (Fig. 74). beta de 
IV. (Fig. 67). The endopodite is a 3-jointed branch. The epipodite 
(ep) is large, and the two gills are seen to be hollow swellings. 
Mxeanors (Figs. 81, 86, and 87). The appendage is now functional. 
There are two basal joints, the first a thin joint, the second is a large 
joint bearing the epipodite. Attached to the upper part of the first 
joint, or probably actually in position as arthobranchs, there are the two 
branchiz, not yet functional, however. Above the base of the epipodite 
there is a small process which is probably the future podobranch. 
The epipodite (ep) has eight long stiff filaments, which are curved at 
their tips. They are with one exception on the outer edge of the epi- 
podite. On the beginning of the epipodite there are three plumose 
hairs. 
The large basal joint is adorned with a row of six plumose hairs. 
The exopodite is 3-jointed and bears four plumose setze at its 
extremity. The exopodite is bent, and the “elbow” joint is strengthened 
by a thickened chitinous plate on the external angle ; it appears to be 
rigid. 
“The endopodite is 5-jointed, and is bent on itself. The first joint is 
a long flat joint, broader distally than at the proximal end (Fig. 97). 
Its internal edge is a little irregular, and it has three little angular 
projections. It is furnished with short hairs, of which some are ciliated ; 
they are mainly located on the edge: a few are surface in position. The 
second is a broad rounded joint, narrower than the distal part of the 
first joint. It is provided with a number of hairs, of which two are 
serrated (Fig. 81). The remaining three joints are armed with serrated 
bristles, the terminal one of which is very long and stout (2. and Fig. 
77). All the serrated bristles are on the anterior or upper surface, that 
is, next the second maxillipede. There is a considerable amount of free 
movement in an antero-posterior plane at the joint between the second 
and third segments. The other joints give little or no movement, 
1. (Figs. 88, 98,103). In this stage no important difference from the 
preceding stage is noted. The three branchie are present, two of the 
branchiz are lobed. The epipodite has an increased number of filaments. 
The basal joint and the proximal end of the epipodite are adorned 
on the posterior surface with, in the case of the former, two rows, and 
in the latter, one row of plumose sete. Alongside the plumose sete 
there is a row of little thorn-like teeth. 
The exopodite (Figs. 88 and 98) is 3-jointed, and has five plumose 
sete. On the inner edge of the exopodite there is, near its distal end, 
a notch. The exopodite moves about on the superior or anterior surface 
of the endopodite, and this notch, into which the hind edge of the 
second joint of the endopodite fits, prevents the exopodite from moving 
too far over the endopodite. There is in the adult a similar notch 
on the exopodite of the third maxillipede: it is accompanied by a 
tuft of hairs. 
Two drawings of the endopodite are given; one, (Fig. 98) represents 
the upper or anterior surface, the other (Fig. 103) shows the posterior 
or ventral surface. The latter is covered over with minute needle-point 
cilia, which have been already noticed as parts of the antennule and 
antenna in this stage. On the third, fourth, and fifth joints of the 
