studies on marine Oslracods tJ8l 



of the shell and partly because it was caught in a region which, from the point of view of its 

 plankton-fauna, presumably agrees very closely with that from which the male described by 

 G. W. MtlLLE]! came. Of course this identification is not quite certain. 



Habitat: — Antarctic Ocean: 



S. A. E., PI. station 70 b, lat. 49« 56' S., long. 49" 56' W.; depth, 2700—0 m.; 27. \'I. 

 1902; temperature at 2700 m. and at the surface, -f 1,67" C and 3 4M" ('. resp. : 1 mature female. 

 On slides in the collections of R. M. S. 



Distributiov : — A singl(> male was captured by the ,,G a u s s" at lat. 35" S. and 

 long. 2" E. 



Serrulata group n. 



(Fseudoconchoecia C Clais) 



Of the species of this genus hitherto described the one dealt with below seems to be the 

 only one that can be referred with entire certainty to this group. 



C. serrulata was provisionally placed by G. W. Ml'ller, 1906 a, in the Loricata group. 

 As far as I can see, this assignment was based practically exclusively on the agreement with 

 regard to the positions of the compound glands. To this character, however, no great systematic 

 importance is to be attached, as the positions of these glands do not differ more or less decidedly 

 from what is the case in most of the other species of this genus, but are, on the contrary, very 

 near to what one might call the normal for this genus. (Cf., for instance, C. rhynchena G. W. 

 MtlLLER and C. plinthina G. \V. MCller, etc.) On the other hand the differences between 

 C. serrulata and C. loricata C. Ceaus — C. ctenophora G. W. Mt'LEER, the two species that form 

 the Loricata group, are not inconsiderable. By including C. serrulata in the Loricata group 

 the systematic unity of this group is lessened to a very great extent. It seemed to me accordingly 

 inconvenient to follow this procedure of G. W. MCEI-ER's and so I have distinguished C. serrulata 

 as a representative of a special group. 



Whether C. concentrica G. W. MCeler is closely related to C. serrulata I cannot say. 

 It does not seem to me impossible. G. W. Mt'ELER writes as follows with regard to this species 

 (1906 b, p. 11): ,,Ich vermag keine deutlichen verwandtschaftlichen Beziehungen zu einer der 

 bekanntcn Arten zu eikennen; manche Charactere sprechen fiir eine Verwandtschaft mit 

 C. serrulata.'"'' 



Conchoecia serrulata C. Claus. 



Conchoecia serrulata, C. Ceaus, 1874 a, p. 176. 



1874b,p. 6; pi. I, figs. 2— 7,9. 10; pi. II, tigs. 12, 13, 17. lit. 

 Halocypris allantica, G. S. BRADY, 1880, p. 164; pi. XL; pi. XLI. figs. 11, 12. 

 Psevdoconchoecia serrulata. C. Clals, 1890, p. 20. 



Zoolog. bidrag, Uppsala. Suppl.-Bil I. f^B 



