recognised as belonging to the same series by the presence of a
dark-yellow, sharply-defined spot surrounding the median eye, the
youngest Zoea (Figure 32), probably produced from the Nauplius, agrees
in all essential particulars with the species just described; its
further development is, however, very different, especially in that
neither the feet of the middle, nor those of the hind-body are formed
simultaneously, and that a stage of development comparable to Mysis in
the number and structure of the limbs does not occur.

(FIGURE 32. Youngest (observed) Zoea of another Prawn. The minute buds
of the third pair of maxillipedes are visible. The formation of the
abdominal segments has commenced. Paired eyes still wanting. Magnified
45 diam.)

Traces of the outer maxillipedes make their appearance betimes. Then
feet appear upon four segments of the middle-body, and these are
biramose on the three anterior segments, and simple, the inner branch
being deficient, on the fourth segment. On the inner branches the chelae
are developed; the outer branches are lost before an inner branch has
made its appearance on the fourth segment (Figure 32). The latter again
becomes destitute of appendages, so that in this case at an early period
four, and at a later only three, segments of the middle-body bear limbs.
The fifth segment is still entirely wanting, whilst all the abdominal
segments have also acquired limbs, and this one after the other, from
before backwards. The adult animal, as shown by the three pairs of
chelae, will certainly be very nearly allied to the preceding species.*
(* The oldest observed larvae (see Figure 33) are characterised by the
extraordinary length of the flagella of the outer antennae, and in this
respect resemble the larva of Sergestes found by Claus near Messina
(Zeitschr. fur Wiss. Zool. Bd. 13 Taf 27 Figure 14). This unusual length