Sludies on marine Ostracods liS? 



defined by G. W. MUller as C. rotundata, in a later work, 1906 a, as C. nasotuberculata*. It is, 

 however, to be noted that ,, Stage 11", according to G. H. FowLER, has no c- and d-bristles 

 on the endopodite of the male second antenna. These bristles are, at least if we are to judge 

 from G. W. MOller's pi. 6, figs. 10 and 11, 1894, developed in C. nasotuberculata. It would 

 perhaps be best to say that the systematic position of ;,Stage 11" is uncertain. 



Besides the fact that G. H. FowLER found that the variation of the shell was not continuous 

 in the material investigated by him the circumstance that exclusively elongated specimens were 

 found in G. W. Mt^LLER's sample from the Pacific Ocean and my samples from the Antarctic 

 may perhaps indicate that two very closely related forms — perhaps overlapping in their 

 variation — have been mixed together. A certain decision in this question would necessitate, 

 however, a very careful investigation of an abundant material. It is therefore desirable that 

 future investigators should give very accurate information with regard to the variation in the 

 material of this ,, species" investigated by them. 



In G. W. Muller's work of 1906 a we find (p. 79) that Halocijpris punica Th. Scott 

 (1894, p. 143, pi. XV, figs. 7, 8, 39, 40) is given as a probable synonym of one of the species 

 belonging to the Rotundata group: ,,welcher Art, das laBt sich bei der mangelhaften Dar- 

 stellung von ScoTT nicht feststellen". This writer, in his work of 1912, puts this species of 

 Scott's as a synonym of C. rotundata, but adds a query. It did not seem to me convenient to 

 include this name in the list of synonyms given above, as there is no close resemblance between 

 these forms; on the contrary there are rather essential differences to be noted both in the shape 

 of the shell and in the second antenna and the rod-shaped organ. As far as I can see, this species 

 of Scott's is not synonymous with any other species hitherto described. 



In G. \V. MULLER's work of 1912 C. rotundata, G. W. Mlller, 1894, is also included as 

 a synonym of this species. The reason why this name was not included in the list of synonyms 

 given above will be seen from what has been said above. In addition I may point out 

 the rather great difference that seems to exist betv/een the penis in the form investigated by 

 me and that of the Mediterranean form; see G. W. MULLER, pi. 6, fig. 20, 1894. 



C. rotundata, Lo BlANCO, 1903, p. 199, is not given in the list of synonyms as it lacks 

 verificatory informations and drawings. ,,C. rotundata'' of this author, 1904, p. 45 is also 

 uncertain; with a very superficial drawing. 



Habitat: — Antarctic Ocean: 



S. A. E., PI. station 64 b, lat. 480 27' S., long. 42" 36' W'.; depth, 2500— u ni.; 23. \'I. 

 1902; temperature at the surface, 7,90" C. : 7 mature males and 9 mature females; R. M. S. 235. 

 S. A. E., PL station 65 b; at the same locality; depth 400 — m.; 23. VI. 1902; temperature 

 at 400m., 3,95" C.: 1 juvenis; E. M.S. 236. S. A. E., PI. station 66b, at the same locality; depth, 



* The stale of affairs is, howover, parlicularly complicated. R is Iruo Ihat G. W. -Mlillkk writes (1906 a) Ihal 

 one of the Naples specimens was to be referred to C. nasotuberculata. but in 1912, p. 77, however, the same auLhor 

 writes „C. rotundata, G. W. MOllf.r, 1894" as a synonym of C. rotundata G. W. MiiLLEK. 1890 a. In the description 

 of C. nasotuberculata it is stated that the rod-shaped organ is constant; the type shown in pi. XVIII, fig. 28 differs, 

 however, considerably from the figures of the same organ in 1894. It is to be noted that in the work of 1912 

 C. rotundata is not included at all as a synonym of C, nasotuberculata. 



Zootng, liidra;. Urr^.i'^ Snpnl -"Rd. T. °v 



