studies on marine Ostracods 313 



The situation of the spines on the bristles of the exopodite of the second antenna seems Equipment of the 

 to afford a good support for G. W. MOller's assumption that they are to be regarded as an '"■^"P'"''"' "/ ""«■ -"^ 



J , ■• r T ■ antenna. 



adaptation for digging. 



Habitat: — Australia: 



Cape Jaubert (type locality), 42 miles W. S. W.; at a depth of about 25 metres; 

 26. V. 1911 (coll. E. Mjoberg): one mature ?, one larva; R. M. S., on slides. 



Sub-Genus Cypridina H.Milne Edwards. 



Cypridina, H. MlLXE Edwards, 1840; Cypridina (part.), J. D. Dana, 1852; Pkilomedes 

 (part.), G.S.Brady, 1880; Pijrocypns, G.W.MtLLER, 1890, 1012 etc. ; Eupathisto^na, G.S.Braby, 

 1898. (Non Cypridina J. Bosquet, Schrenk and other authors on fossil Ostracods.) 



Description: — Shell: — The shape is similar or somewhat, in most cases, however, 

 rather slightly, different in the male and the female. It is rather elongated. The rostrum has 

 always a distinct ventral corner; the rostral incisur is comparatively narrow and moderately 

 deep, sometimes even rather shallow. The posterior part of the shell has a well-developed beak- 

 shaped process. Near the inner edge of the incisur there are two medial bristles situated close 

 to each other, at least in most of the species. Calcification? The forms are moderately large, 

 all of them being about 2 mm. in length. 



First antenna: — This is long and slender and has seven or eight joints; the 

 fifth and sixth joints seem in most cases to be more or less joined together; the joining is sometimes 

 even complete; the small end joint also seems sometimes to be not quite distinctly defined. 

 The sensory bristle of the fifth joint has comparatively few (always less than thirteen?) filaments. 

 The b-bristle has precisely the same modification in the males as in the sub-genus Doloria. 

 Note that in the female of the only species of this sub-genus that I have had an opportunity 

 of investigating this bristle had no filaments at all. The c-bristle is characterized by having, 

 apart from the proximal filament with only one sucker, only one, not two, filaments with suctorial 

 organs; in other respects this bristle is also like that of the sub-genus Doloria. The small suckers 

 on bristles b and c are very weakly developed. In the males the c- and f-bristles are very much 

 longer than in the females. 



Second antenna: — Protopodite: This has a medial-distal bristle. E .\ o- 

 podite: The bristle of the second joint is rather weakly developed. The natatory bristles 

 on the third to the ninth joints are quite without spines. The third to the ninth joints have 

 basal spines. Endopodite: This is similar in the male and the female and is very much 

 reduced; it is verruciform; the distal (sensory?) bristle is comparatively short. 



Mandible: — Protopodite: The endite on the coxale is rather weakly bifur- 

 cated distally; its spines are moderately strong or else weak and have no distinct arrangement 



Zoolog. bidrag, Uppsala. Suppl-.Bd. J. *'J 



