318 
Notwithstanding the fact that there seem to be good reasons for 
expecting the occasional occurrence of a condition such a just outlined, 
the writer has never seen another so striking example as the one 
under discussion. 
In my material the number of chromosomes seemed to be eighteen, 
the different counts resulting in figures ranging from fifteen to nineteen. 
The individual chromosomes were short, ellipsoid or almost spherical. 
In many cases they were plainly arranged in the tetrad or ring 
formation which has been observed in a pretty general variety of 
investigated species. 
The chromosomes are formed by the gradual accumulation and 
condensation of the chromatic substance at definite points on the linin 
threads. At no period during the growth and formation of the 
chromosomes was the slightest evidence observable of any longitudinal 
splitting. The chromatic substance is also apparently increased in 
quantity at the expense of the nucleolus which disappears during the 
later anaphase stages. 
In the few cases of mitosis which were found, the centrosomes 
were clearly defined bodies and were located in the center of an 
evident but not extensive radiation of the cytoplasm. 
The spindle fibres are relatively large in cross section and are 
probably made more conspicuous by the accumulation of stainable 
lanthanin granules along their length. The interzonal filaments do 
not break asunder until the two cells are completely separated. 
In the metamorphosis of’ the spermatids, a great variety of forms 
was observed as has been remarked by v. BARDELEBEN and other 
authors. The condensation of the chromatic substance into a crescentic 
mass was readily noticeable. The interzonal fibres mass together and 
persist as a distinct body but I was unable to determine its ultimate 
fate in the spermatozoon. 
The centrosome was usually to be traced into the neck of the 
spermatozoon. In the apex of the head there was frequently but not 
invariably a small deeply-staining body whose origin I was unable to 
determine. 
