18 G. O. Sars. 
Cladoeera. 
Trib. Anomopoda. Fam. Daphnidæ. 
Gen. Moina, Baird. 
3. Moina flexuosa, G. O. Sars, n. sp. 
(PL 3.) 
Specific Characters.—Carapace with the dorsal 
part, in gravid female specimens, often very much, almost 
globularly expanded, ventral edges of valves highly flexuous, 
bulging in the middle to an obtuse prominence, behind 
which is a distinct, though rather shallow sinus. Head in 
female not very large, but remarkably erect, seen laterally 
triangular in form, with the ventral margin nearly straight and 
continuous with the labrum, frontal part narrowly rounded 
and somewhat prominent, supra-ocular sinus very slight, 
cervical impression strongly marked. Eye of moderate size. 
Antennulæ of female about half the length of the head, 
subfusiform, sensory bristle of the anterior edge situated 
nearly in the middle. Caudal claws perfectly smooth, ante- 
anal denticles about 8 on each side, the outmost placed at 
some distance from the others, and, as usual, bidentate. 
Ephippium with only a single egg-ampulla placed longitudi- 
nally. Male resembling that of the other species, but having 
the ventral edges of the valves flexuous in a similar manner 
to that in female. Body in both sexes highly pellucid, 
having sometimes, in larger female specimens, a slight rosy 
tinge. Maximum length of female 0.9 mm, of male 0.5 mm, 
