of the Fishery Board for Scotland. 161 
II.-IV. In the remaining Zoéa stages the eyes are quite free from 
the carapace, and have very short stalks. Fig. 157 represents the eye 
of the LV. Zoéa. 
Mecators (Figs. 152 and 153). The eyes have very long thick 
stalks, through which they are projected laterally well out beyond the 
edge of the orbit. 
In succeeding stages, development, so far as concerns the eye, consists 
in its gradual reduction in size, and in its shifting from a lateral to an 
antero-posterior position. 
1 (Fig. 167). The eyes are much reduced in comparative size. 
2, 3, and 4 (Figs. 173, 170, and 171). The eyes are now bending 
forward. The eye is, however, too large to be contained within the 
orbit. 
Cras 5:5 mm, across (Fig. 172). The eye can now lie down in the 
orbit. 
Apu (Fig. 168). The narrowing of the frontal region has brought 
the eyes closer together. The bend in the eye stalk was first noticed in 
the third and fourth young stages. The eyes are now very small. 
The eye has simply taken part in the generalalteration in the anterior 
half of the carapace. 
CaraAPAck, Plates xii. and xiii. 
I., IL., ITI. (Figs. 159, 148, and 147). The carapace of the Zoéa is, 
except in possessing the dorsal spine, similar to that of a Macrouran. 
It is prolonged in front into the long, almost straight, rostral spine ; and 
from the middle of the dorsum, immediately over the heart, rises the 
curved dorsal spine. In these stages no hairs were found on the edge 
of the carapace. 
IV. (Fig. 146). The carapace is as in previous stages, except that 
there is now a row of small ciliated hairs attached on the inner side 
of the margin. 
Mecators (Fig. 153).—The dorsal spine has disappeared, and the 
rostral spine is reduced to small dimensions. Over the surface of the 
carapace, and round the hind lateral border, there are distributed 
small plain hairs. The hairs are symmetrically arranged as shown in 
the sketch. The frontal region is broad, and the eyes are in conse- 
quence widely separate. It has no lateral teeth. 
The carapace is longer than it is broad. 
1. (Fig. 166). The four lateral teeth appear in this stage, and of 
these, two are more prominent than the others. The corner of the orbit 
might be regarded as a tooth, but it is not properly so designated. The 
general form of the carapace is nearly circular. It is just about as 
broad as it is long. The broad frontal region is noteworthy. The 
rostral spine has disappeared, and the frontal area shows a trilobed 
waving. 
The carapace is covered on its dorsum with the minute “needle- 
point” cilia, and it is supplied with ciliated and plain hairs. The 
ciliated hairs which are located on or near the edges are similar to the 
ciliated hairs found on the dorsum of the abdomen (Fig. 128). The 
plain hairs are scattered over the dorsal surface of the carapace. The 
minute cilia are very thickly distributed: in the drawing their size is 
exaggerated. 
“From the first to the sixth young stage the carapace assumes its 
normal shape by a gradual increase in its width compared to its length. 
With each successive moult the lateral toothed margins are pushed 
more forward and the teeth become more prominent.” (Brook.*) 
"ION, othe 
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