J 2 EI SEN. [Vol. XVII. 



dispersed at an even earlier stage, the secretions of its gran- 

 ules, or perhaps even the granules themselves, supplying mate- 

 rial for the new membrane which is formed between the two 

 daughter-cells. 



In a paper on the plasmocytes of Batrachoseps I have de- 

 scribed and designated the spheres of the erythrocytes as gran- 

 osphere, hyalosphere, and plasmosphere, these three spheres 

 being of strictly cytoplasmic nature. A comparison with the 

 spheres of our present cells satisfies me that the inner sphere 

 is identical with the granosphere. For the outer sphere I use 

 the name plasmosphere, though it is not absolutely settled to 

 my satisfaction that they are in every way identical. But the 

 similarity is considerable, even to the extent that we find be- 

 tween the plasmosphere and the granosphere at times another 

 zone which probably is identical with the hyalosphere (Figs. 8, 

 1 6, 17, 34). In this paper I will, therefore, refer to the two 

 spheres as the plasmosphere and the granosphere. While in 

 the plasmocyte the non-staining sphere surrounding the grano- 

 sphere has the form of a narrow, even band, the non-staining 

 zone in our present cells is frequently aster-like, radiating 

 through the plasmosphere (Figs. 6-8, 14). The three spheres 

 during all their different stages of evolution possess a granu- 

 lated alveolar structure, the cytoplasm proper taking the form 

 of frequently granulated fibrilla, especially nearest the cell 

 wall. 



When I had almost finished this paper I found that Meves 

 has proposed the name "idiozom" for the two spheres, or, as 

 he defines it, " for the specific covering which surrounds the 

 Centralkorper in the testes cells." The word is apparently 

 selected under the supposition that the spheres are especially 

 intended for the Centralkorper. That such is not the case I 

 expect to show in this paper. Moreover, the new word does 

 not distinguish between the two spheres, which, as I expect to 

 demonstrate, are distinct and independent structures. If we 

 are to retain one name for the two spheres, then the word 

 "archoplasm" seems to me as good as any other. Neither of 

 the two words expresses the true nature of the bodies which 

 they are intended to designate. The names which I propose to 



