VI ANOMURA—GALATHEIDEA 
Galathea, are littoral animals, and may be 
found hiding under stones and in crevices 
on the shore; but a number occur in deep 
water, e.g. Munida and Munidopsis. 
The shallow-water species have ordin- 
arily developed eyes; the various species of 
Munida, which occur in fairly deep but by 
no means abyssal regions, have usually very 
large and highly pigmented eyes; while in 
Munidopsis, which is characteristic of very 
deep water, the eyes are degenerate and 
colourless, as shown in Fig. 114. 
The Zoaeae, or young larval stages of 
the Galatheidea, are characterised by the 
immense length of the spines upon the 
carapace (Fig. 115). The young Zoaea 
which hatches out from the egg resembles 
in other respects that of the Brachyura. 
The Metazoaea, however, differs from that 
of the Brachyura in the fact that the third 
maxillipede is first present as a biramous 
swimming organ, and at its first appear- 
ance is not developed in its definitive form. 
The other thoracic limbs are not schizo- 
podous when they appear, and indeed in 
nearly all respects the development proceeds 
as in the Brachyura. 
Fam. 1. Aegleidae.—The gills are tri- 
chobranchiae, and there are eight arthro- 
branchs. There are no limbs on _ the 
second abdominal segment of the male. 
The abdomen is not carried folded on to 
the thorax. The first two characteristics 
separate this family from all the other 
Galatheidea. Aeglea laevis, a fresh-water 
species from the rivers of temperate 5. 
America, is the sole representative. 
Fam. 2. Galatheidae.—The abdomen is 
not folded against the thorax. The mem- 
bers of this family are often littoral’ in 
169 
NN 
NY 
eae w 
Ne 
Fic. 115.— Zoaea of 
Porcellana, 
T, Telson. 
Claus.) 
x20) 
(After 
