1897 | CURRENT LITERATURE 223 
longitudinal fission of the chromosomes appearing later, while in the hetero- 
type longitudinal fission of the whole ribbon precedes the segmentation into 
chromosomes. Segments of homotype chromosomes appear homogeneous dur- 
ing karyokinesis, while those of the heterotype show a row of granules on each 
margin. The segments of homotype chromosomes are nearly parallel and 
quite regular, while those of the heterotype are twisted and contorted in 
the nuclear plate. Segments of the homotype diaster are usually hooked, 
while those of the heterotype diaster are V-shaped.—C. J. C. 
