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EISEN. 



[VOL. I. 



The archosomc, or centrosomal structures, consists of three 

 distinct parts, situated one interior to the other. These three 

 parts constitute one single organized and individualized body 

 -the archosome. The most interior part is the centriole ; this 

 centriole is surrounded by a thin layer or zone - - the somosphere. 

 The somosphere is surrounded by a generally non-staining 

 zone --the centrosphere. There are one or more centrioles. 



Fio. 3. An auxocyte in the "bouquet stage." There are twelve leaders starting from five 

 chromoplasts. The leaders consist of chromomeres containing chromioles suspended in a 

 film of chrornoplasm. The spheres are of a foam-like structure. There are three accessory 

 archosomes and one archosome with two centrioles. The open space between the inner 

 granosphere and the outer plasmospherc represents the hyalosphere. The cytoplasm is only 

 partially indicated. 



Both the somosphere and the centrosphere are amoeboid, 

 especially the centrosphere. The latter constitutes the organ 

 of locomotion of the archosome. There arc besides the archo- 

 some several accessory archosomes. The function of the 



