ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
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it is frequently represented in Centipedes. As to the trisporous forms 
and the genus Bananella of M. Labbe, an abortion of one of the tetra- 
spores of the Coccidium - type may be sufficient explanation. 
Life-Cycle of Coceidia.* — M. Louis Leger has studied various Coc- 
cidian parasites in Myriopods and Insects, and has come to the conclu- 
sion that in Arthropods the genus Eimeria does not represent a distinct 
parasite, but rather a stage in the life-cycle of a Coccidian. There seems 
to be no ease known in which an Arthropod with Coccidia does not also 
include phases of an “ Eimerian ” cycle. The life-history of a Coccidian 
may thus be summed up : — “ Eimerian sporozoite, encapsuled form, 
tetrasporous cyst (Coccidian), coccidian sporozoite (penetrating into the 
host), Eimerian budding, and then the Eimerian sporozoite again.” The 
author proposes to show that the Eimerian sporozoite corresponds to the 
sporoblast of Gregarines, and the tetrasporous cyst of a Coccidian to 
the spore of Gregarines. 
* Comptes Rendus, cxxiv. (1897) pp. 966-9. 
