198 TAGE SKOGSBERG 



Only in the case of two species belonging to this sub-1'aniily, Cypridina (Doloria) 

 peclinata and Cypridma (Vargtda) norvegica have I had an opportunity of investigating specimens 

 captured at different periods of the year. I found that sexually mature females with embryos 

 in the brood chamber and also larvae in different stages of these two genera appeared at all the 

 periods at which specimens were captured. It seems accordingly probable that these two 

 species do not have any definite more or less short pairing period but that propagation in 

 their cases takes place during the wliolc year. The same thing seems to apply to the oth(M' 

 species belonging to this sub-family (as in all other (' y p r i d i n i f o r m s?) 



It is uncertain whether the fertilization takes place during a pairing flight similar to that 

 observed in the case of Phdomedes (Ph.) glohosa. All we know for certainty is that benthoic species 

 of this sub-family have also sometimes been observed in plankton; we find information — though 

 it is scanty — about this in the literature. 



The males seem, at least in some species, to survive for rather a long time after attaining 

 sexual maturity. There is. as we know, no reduction of the masticatory limbs as in Phi'io- 

 inedes and Sarsiella. A species of this kind is Cypridina (Vargula) norvegica; the males 

 and females of this species were found equally numerous during all times of the year. — On 

 the other hand, in the samples of Cypridina (Doloria) pectinata investigated by me sexually 

 mature males were very rare. During the last larval stage this sex was, however, found to be 

 somewhat more numerous than the female sex (proportion = about 5 : 4). Do the males 

 die comparatively soon after the fertilizatioia of the females in this species? 



Genus Gigantocypris G. W. Muller. 



(rigantocyprin, auto r u m. 



Description: — C'f. G. W. Mt'LLEK, 1895. p. 164. 



Shell: — More or less globular. With small but proportionately rather deep and 

 narrow rostral incisur; the bristles within the incisur variable. Posteriorly close to the hinge 

 the edges of the valves are separated, by means of which a small, somewhat rounded opening 

 is formed. The valves united along about 2/3 of the periphery. Tlie adductor weakly developed. 

 Balloon-shaped; walls very thin, presumably without lime incrustation. Very large forms. 



First antenna: — Dong, slender, with 7 — 8 joints; for the proportion between 

 the joints see the species description below. Tlie third joint relatively long. The sensory 

 bristle ot the fifth joint has a moderate, son\ewhat varying, number of filaments, rather more 

 numerous in the males than in the females. On the bristles I) and c one or more of the proximal 

 rami in the male are modified for seizing the female. These rami, all of which are placed medially, 

 are all of about the sam(> type, rather short and powerful, somewhat swt)llen proxiinally. 

 moderateh- chitinized distall}-, most often ending with a shoit hair; a little proximally to half 



