studies on marine Oslracods (iSl 



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

 plankton-fauna, presumably agrees very ch)sely with that from which the male (lescribcd l)v 

 (J. \V. Mri.LKl! 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. VI. 

 1902; temperature at 2700 m. and at the surface, + 1,67" V. and .3 40" ('. resp. : 1 mature female. 

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



Distribution: — A single male was captiired by the ,.0 a u s s" at lat. 35" S. and 

 long. 2" E. 



Serrulata group n. 



{Pseudoconchoecia C. Clai'S) 



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. Mullein, 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. 

 MiJLLER and C. plinthina G. W. MCller, etc.) On the other hand the differences between 

 C. serrulata and C. loricata 0. Claus — C. ctenophora G. W. MOller, 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. MCller's and so I have distinguished C. serrulata 

 as a representative of a special group. 



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

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

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

 bekannten Arten zu erkennen; manche Charactere sprechen fiir eine Verwandtschaft mit 

 C. serrulata.'' 



Conchoecia serrulata C. Claus. 



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



1874 b, p. 6; pL I, figs. 2— 7, 9, 10; pi. II, figs. 12, 13, 17. 19. 

 Halocypris atlantica, G. S. Brady, 1880, p. 164; \)\. XL; pi. XFJ, figs. 11. 12. 

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



>!oolog. bidrag, Uppsala. Suppl.-Bd. I. 86 



