17 
some very short setæ. The antennæ do not reach to the end of 
the rostrum, their cbelæ are weak and unfit for grasping. The 
sipho is very large; the maxillæ and mandibular palps well devel- 
oped, the maxillipeds long, their terminal clavv clumsy. In some 
individuals a second (posterior) pair of rudimentary maxillipeds 
is present; these specimens are males. Chitinous ridges on the 
Fig. 2. First pupal stage (B) from ventral and Fig. 3 from dorsal side. 
<x 1 antennule; a 2 antenna; md mandibular palp; mx maxilla; mp x first 
maxilliped; l chitinous thickenings; p x , p 2 first and second abdominal 
(thoracic) feet; f furcal appendage. 
nephalothorax arranged as in the Cyclops-stage and the adult; the 
same is the case with all the following stages. Two pairs of ab¬ 
dominal feet are present, both biramous and quite without setæ; 
they are not distinctly segmented but slight incisions mark off a 
basal portion and two parts of each ramus. 
C. (PI. II, Fig. 13.) The next pupal stage has a length of 
ca. 1 mm. (the cephalothorax alone being ca. 0,82 mm.). A third 
abdominal segment is now indicated. The antennules, antennæ etc. 
are in the main like those of the preceding stage, but a third pair 
Vidensk. Meddel, fra den naturh. Foren. Bd. 64. 2 
