Marine Plankton from the East-Greenland Sea. 



295 



Dimensions (in ц) : Length and Breadth 615 x 78 and 650 x 80. 



с var. robusta Jørgensen, 1901, p. 13, pi. 3, fig. 22; 1905, p. 144; 

 Brandt, 1906-07, p. 234, pi. 38, figs. 4, 10. (Fig. 5). 



In many samples where var. typica was present, another prob- 

 ably well-distinguished form also was found. It had about the same 



size as that, but differed in the rather 

 sharply set-of "Fortsatz", the small 

 and broad teeth of the mouth and 

 in the much coarser wall of the 

 house-wall. The latter character was 

 very easily seen under low power 

 of magnification as the transparence 

 of the wall was quite another. No 

 doubt it is the var. robusta of Jør- 



Fig. 4. Cgttarocylis denticulata Ehrbg. 

 var. giganten (Bdt.) Jørg. 250 t. m. 



Fig. 5. Cgttarocylis denticulata 

 Ehrbg. var. robusta Jørg. 250 t. m. 



GENSEN (1. с), as my fig. 5 will prove. Sometimes specimens were 

 found which had not the well-developed "Fortsatz", but elsewhere 

 agreed with the var. robusta; these may be named f. subrotundata 

 Jørg. (1899, p. 34, pi. 2, figs. 20—21, pi. 3, figs. 22, 25, 29; Brandt, 

 1906—07, p. 235, pi. 37, figs. 12—14), which I subordinate under var. 

 robusta. 



The variety was dominant, together with var. typica, in the 



