17 
some very short setæ.. The antennæ do not reach to the end of 
the rostrum, their chelæ are weak and unfit for grasping. The 
sipho is very large; the maxillæ and mandibular palps well devel- 
oped, the maxillipeds long, their terminal claw clumsy. In some 
individuals a second (posterior) pair of rudimentary maxillipeds 
is present; these specimens are males. Chitinous ridges on the 
£ 17 
Fig. 2, First pupal stage (B) from ventral: and Fig. 3 from dorsal side. 
a, antennule; a, antenna; md målene palp; mæ mazilla; mp, first 
maxilliped; 1 chitinous thickenings; p;, Pe first and second abdominal 
(thoracic) feet; furcal appendage. 
Cephalothorax 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. (Pl. II, Fig. 13.) The next pupal stage has a length of 
Ca. 1 mm. (the cephalothorax alone being ca. 0,82 mm.). A third 
aåbdominal segment is now indicated. The antennules, antennæ etc. 
åre in the main like those of the preceding stage, but a third pair 
Vidensk. Meddel. fra den naturh. Foren. Bd. 64. 2 
