1917] Kofoid-Swezy: On the Orientation of Enjthropsis 



93 



symmetry such as that induced by a change in the direction of the 

 girdle as described above must be accompanied by an internal reor- 

 ganization of the nucleus, mitotic figure, and fission plane, as well of 

 of the exoskeleton and furrows. This reorganization would involve a 

 shift of axes and attendant internal morphogenic factors of about 90° 

 from the left over to the right. 



Fig. 7. Ventral view of two schizonts of Ceratium in chain. After Kofoid 

 (1909, pi. 1, fig. 1, two anterior schizonts and apical horn of the third). Note 

 apical pore of- horn of posterior schizont lodged against the attachment area 

 of the anterior schizont. X 405. 



Fig. 8. Daughter schizonts of Cochlodiniiim citron sp. nov. in chain, with 

 apical region of the posterior schizont applied to the region of the end of the 

 girdle of the other. X 937. 



Such a profound reorganization as this should be proven beyond 

 suspicion before it may be accepted. The place of origin and direction 

 of the transverse flagellum in Erythropsis as figured by Faure-Fremiet 

 (1914), if the body is oriented as it is by all other observers of this 

 organism, presents just such a reversal of symmetry. 



