Sporozoa 321 



wall into the tissue spaces or blood stream, and thence into some particu- 

 lar type of tissue cell; or as in a number of species, the trophozoite re- 

 mains in the epithelium of the gut. In any case the young trophozoite 

 grows and reproduces by binary fission (Fig. 6. 32, B, C), as in Nosema 

 termitis, or else by "schizogony" (Fig. 6. 32, F-H), as in Duboscqia legeri 





Fig. 6. 32. A-E. Nosema termitis, x2990 (after Kudo): A. Young amoeboid 

 trophozoite. B. C. Stages in fission of trophozoites. D. Young sporont. E. 

 Immature spore; compare with Fig. 6. 31, H. F-K. Duboscqia legeri, x2760 

 (after Kudo): F-H. Stages in schizogony. I. Sporont with four nuclei. J. 

 Sporoblasts have developed within the sporont membrane. K. Two immature 

 spores which have developed from sporoblasts within the sporont membrane. 



(73). The products of reproduction may repeat the reproductive cycle, or 

 they may become sporonts which produce spores (Fig. 6. 32, D, I). 



A sporont may develop directly into one sporoblast, as in Noseina 

 termitis (lb), or may undergo nuclear division and produce a number 

 of sporoblasts within the original sporont membrane (Fig. 6. 32, J, K). 

 Sporoblasts are either uninucleate or binucleate, depending upon the 

 species. It has been impossible to determine with certainty the occurrence 

 of nuclear division during development of the sporoblast. The best 



