152 DR. R. YON WILLEMOES-STTHM ON THE 
PLATE 14. 
Fig. 22. An adult Nauplius after its fifth moult (last Archizoea stage). The labrum is 
in its ordinary position. All the appendages have been removed, in order 
to show the glandular system inside the carapace and the masses of adipose 
pigment accumulating there. The latter are only shown on one side in order 
not to confuse the drawing. From the surface. H. ac, caudal spine; 
ad, large dorsal spine ; ay, small forked hooks on the middle line of the tail 
(fig. 22, ay, the same seen under very high power) ; coe, caeca in the upper 
lip leading into the stomach ; cl, adipose body (fat-cells) ; cp, lateral horns ; 
dr, glands in the interior of the carapace ; gl, glands terminating in the pro- 
cesses of the carapace ; nc, nervous cell ; n, nerves ; o, first formation of the 
lateral eye, which very soon will present the same aspect as those drawn in 
fig. 23, o ; oes, oesophagus ; ft, processes of the carapace, with an opening of 
the gland at the top; sp 1 , movable spines; sp 2 , immovable spine; x, feelers. 
Natural size — 
Diameter of the carapace .... 2 millims. 
Length of the tail 8 „ 
Length of the caudal spine . . .12 ,, 
Fig. 22 a . First antennae of an adult Nauplius near its last moulting into the Cypris 
stage. 1-6, the joints; a-S, the underlying joints of the Cypris antenna; 
acet, the cells which build up the sucker. 
Fig. 23. Anterior part of the Nauplius, last Archizoea stage of a Cirriped from the 
surface of the Antarctic sea (1 Lepas australis, described by Dohen as Archi- 
zoea gigas ), in order to show the processes into which the glands terminate 
all over the carapace, and the state of the lateral eyes before the moulting 
for the Cypris stage takes place. From a preparation in Canada balsam. 
H. la, labrum ; gl, glandular system inside the carapace ; pr, processes ; 
cp, lateral horns ; y, vesicular connective-tissues, patches of which are to be 
found in the glandular substance of the carapace ; x, the feelers ; o, the two 
compound lateral eyes of the Cypris stage into which this Nauplius was pre- 
paring to moult. Natural size : — 
Length of carapace 2'0 millims. 
Width of carapace I - 50 millim. 
PLATE 15. 
Fig. 24. Free-swimming Cypris stage (after the sixth moult), from the sea-surface. 
Antennae and feet retracted into the shell. Partly from living specimens, 
partly from Canada-balsam preparations. H. y. a, the antennae, with the 
sucker ; m, different muscles ; ma , musculus adductor ; gl 1 , gland leading into 
the antennae ; gl 2 , gland of the shell (visible in nearly all prepared speci- 
