No. 612] MYXOSPORIDIAN LIFE CYCLE 



733 



the big cell can not be traced without doubt. Therefore, 

 most investigators have lately used smears to get a fuller 

 and more correct view of the origin of the different cells 

 from each other. It is astonishing how scanty the details 

 appear when one considers the formation of the quad- 

 ruple group in Auerbach's, Lo Giudice's, Parisi's and 

 Georgevitch 's presentations. Mercier's Figs. 19-27, Plate 

 1; Auerbach's Figs. 8fl-15, Plate 2; Lo Giudice's Figs. 

 29-34, Plate 1 ; Parisi's Figs. 13-18, Plate 16 ; and George- 

 vitch 's Figs. 32-35, Plate 1, do not show each single step 

 of this important process. Connecting stages are missing. 

 Therefore, one is allowed to interpret differently their 

 presented facts, as I have done in Fig. 5. In Table II 



Myxoholus pfeifferi Mercier. Spharomyxum sabra^esi Schroeder. 



Cell A (copula) forms all other 12 B, 



f^'Hunzellenkerne." 



Myxobolus ellipsoides Eenneguya gigantea Eenneguya psorospermica 



LoGuidice. Georgevitch. Auerbach (Type I). 



the pansporoblast. 



we can study the different opinions from the authors' 

 point of view. Lo Giudice, Georgevitch, Auerbach, Keys- 

 selitz, and Schroeder are alike in interpreting that the 

 two cells which develop into the pansporoblastic mem- 

 brane or nuclei are separated very early from the other 

 cells. They never intermingle with those cells inside the 

 spore-membrane (except according to Schroeder). They 

 can not, therefore, be microgametocytes and in ronso- 

 quence they have nothing whatsoever to do with a soxnal 

 phenomenon. This adds strong support to our view that 



