studies oil marine Oslracods 719 



relatively somewhat liiglier posteriori}', but otherwise it is of abcnit the same type as in the 

 male. Seen from ])elow it is of the same shape as in C. burealis. 



In the case of tlie o t h e r org a n s it agreed with C. borealis. 



Remarks: — As is seen aljove, this form is looked upon by (}. \\ . Mil-l.iiH as a special fi-ioiini, i., 



species. It seemed to me, on the contrary, best to put it as a variety of C. borealis G. O. SaR8. 

 The differences that distinguisli it from this form — the length and sculpture of the shell, 

 the number of spines on the e-bristle of the male first antenna and the armatiu-e on the d-bristle 

 of this limb — are so small that they seem to me to form an adequate argimient in favour of 

 this alteration; cf., for instance, the difference between C. obtusata G. 0. S-VKS and its varietv 

 antarctica. 



G. W. MULler puts forward (1906 a. p. Ill) a number of other differences between these 

 two forms besides those pointed out above. The explanation of this is probably partly that 

 this writer had only maxima forms of C. borealis at his disposal and partly also his somewhat 

 deficient knowledge of this form. 



"o^ 



Habitat: — Ant a r c t i c c e a'n: 



S. A. E. , PL station 64 b, lat. 48" 27' S., long. 42" 36' W. ; depth, 2500—0 m. ; 23. VI. 1902: 

 2 mature males, 16 mature females and 12 juvenes; R. M. S. 305, 306. 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" C. and 3,40" C. resp. : 5 mature females and 4 juvenes; R. M. S. 307. 



Distribution: — South Atlantic Ocean and Antarctic Ocean between lat. 1" S. and 

 lat. 65" S. 



The finds of the ,,A n t a r c t i c" arc consequently made within the area of distribution 

 stated by G. W. Mui.LEi^. 



Imbricata group G. W. MOller 



(Conchoecissa C Cl.Als)*. 



This group, comprising five species, is certainly quite natural. I cannot say with certainty 

 whether C. frosadene G. W. Mi'Li-iOH belongs to it; it seems probable that it is not closely related 

 to these species. 



Conchoecia symmetrica G. W. MOller. 



Cuncliuecia symmetrica, G. W. Ml'LLEU, 1906 a, p. 117; pi. XX\ 11, figs. 7, 8, 13, 15, 16. 



„ :, „ 1908, p. 78. 



.. .. „ 1912. p. 90. 



• G. O. Saks suggested- as early as 188" that .Jlalnajpris imhricala G, S. Hr.mm" slunild lie luoki-ii out as a 

 special genus, l)vil nil the same he did nut make this himself. 



