18 
of abdominal feet is now present as short, flattened appendages to 
the second abdominal segment; a division into a basal segment and 
ramus is indistinctly indicated. The distal setæ of the antennules 
are somewhat larger, and the two biramous feet now show a set of 
extremely short setæ; the furcal setæ are much as in the stage B. 
D. (PI. II, Figs. 14, 23). The following stage is ca. 1,6 mm. 
in length (the cephalothorax 1,12 mm.) Antennules, antennæ, maxilli- 
peds and feet are still clumsy ; the abdomen has three distinet segments. 
Third pair of abdominal feet has about half the length of the two 
anterior pairs; the last abdominal segment is without feet as in the 
adult. The segmentation of the feet is more marked than in the 
preceding stage, the basal segment and two segments of the rami 
being now quite distinct, most so in the anterior pair (cfr. Pl. II, 
Fig. 23). The same number of setæ as in the adult are present, 
and the setæ are now much more developed but still clumsy and 
pressed against each other; the same is the case with those of the 
antennules. Male specimens show the second pair of maxillipeds 
(Fig. 14 mp,) as short, bent appendages about on the level with 
the "elbow” of the first maxillipeds. 
E. (Pl. II, Figs. 15, 24—26.) Stages of ca. 2 mm. length 
(the cephalothorax ca. 1,36 mm.) seem to be the last pupal stages 
producing the copulatory form. This may be concluded from the 
following observations: 1) inside the cuticle of this stage is seen a 
Copepod-form resembling the adult in many details; 2) a propor- 
tionally great number of specimens of this stage has been found, 
but not a single pupa of larger size or more developed. In this 
stage the general shape of the body and its appendages are less 
clumsy than in the preceding; all the setæ are much longer, the 
segmentation of the feet more pronounced; the postabdomen — in- 
cluding the future genital segment — is now about of the same 
length as the abdominal segments taken together. The setæ appear 
more free of each other, and those of the feet show delicate plum- 
ules at their extreme, very thinwalled ends (Textfigure 4). En- 
closed below the cuticle of this pupa another Copepod-form is seen; 
