90 EISEN. [Vol. XVII. 



possible that even these structures are ephemeral ones, and that 

 ultimately they also may be proven to be aggregations of more 

 permanent granules. 



X. Nomenclature. 



Accessory Archosomes. — All archosome-like bodies found in 

 the cytoplasm, and which have the same structure as the true 

 archosome, that is, consist of centriole, somosphere, and cen- 

 trosphere. Siderophile granules of A. Bolles Lee. The acces- 

 sory archosomes differ only from the archosome in function, the 

 latter presiding over the formation of the spindle. They origi- 

 nate from the archosome (Fig. 69). 



Alveoli. — Rounded or variously shaped vacuoles, surrounded 

 by granules. They contain secretions of various kinds, accord- 

 ing to the structure in which they are found. 



Angular Segments. — The spireme segments have con- 

 tracted and straightened out, and have become of uniform 

 thickness throughout (Fig. 34). 



Archosome or Spindle ArcJiosome. — The perfectly developed 

 archosome which guides the formation of the central spindle. 

 It generally dwells in the granosphere when it is not situated 

 at the pole of the spindle. It is composed of an outer centro- 

 sphere, an inner somosphere, and one or more interior centri- 

 oles. It is not an integral part of the granosphere. The 

 archosome gives origin to the accessory archosomes by bud- 

 ding. The granosphere and the plasmosphere are not parts 

 of the archosome. The word " archosome " was first proposed 

 by me in my paper on the Plasmocytes of Batrachoseps. 



Anxocytcs. — This name was first proposed by A. Bolles Lee. 

 The first maturation cells, the last generation of daughter-cells 

 of the polymorphous spermatogonia. Only one generation. The 

 mitosis is heterotypic with twelve chromosomes, and is charac- 

 terized by the bouquet stage. Mitosis by equation division. 

 The nucleus is never polymorphous. 



Bouquet Stage. — The spireme leaders have contracted and 

 formed twelve segments of about equal size, one end of which 

 is attached to the chromoplast, the other being free, and ending 

 in the vicinity of the spheres, thus forming a figure resembling 



