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Nachdruck verboten. 
The Development of Germ Cells from differentiated somatie 
Cells in Moniezia. 
By C. M. Chip. 
With 9 Figures. 
In the course of a study of the relations between mitosis and 
amitosis in the cestodes Moniezia expansa and M. planissima, of which 
a brief account has been given in an earlier paper!) considerable 
attention was devoted to the earliest stages of testis-formation. Certain 
of the observations regarding the origin of the testes appear to be of 
sufficient interest to merit a brief description apart from the other 
results of the work which will appear later. 
In the young proglottids before the appearance of the testes 
dorso-ventral sections show numerous large muscle-cells in the central 
region. These cells (Fig. 1) are readily distinguished, since they are 
the largest in the body, often considerably larger than the one shown 
Fig. 1. 
in the figure, and of very characteristic appearance. They are more 
or less elongated dorso-ventrally and each encloses a portion of a 
dorso-ventral muscle fibre which is evidently a differentiation from 
the cytoplasm. The greater portion of the cell body lies at one side 
of the muscle fibre and in this is the large nucleus containing a large | 
deeply staining nucleolus, but usually showing no other visible struc- 
tural differentiations unless very deeply stained when small granules 
often appear. 
The cytoplasm of these cells, which stains only very slightly, is 
distributed in a characteristic manner, a part surrounding the nucleus, 
1) Caıtp, Amitosis in Moniezia. Anat. Anz., Bd. 25, No. 22, 1904. 
