287 
the nucleus of these cells divides by direct or amitotic division without 
any subsequent division of the cytoplasm. 
The dendrites of the cells are large but few and branch strongly. 
The neurites are of very large size, and the fibres that compose 
them are plainly seen in 
almost any preparation. 
These neurites pass into 
the same fibre bundles as 
in Paralichthys and 
the fibres of these bundles 
are of large size, 0,15 to 
0,02 mm which is larger 
than MAUTHNER’s fibre in 
the same fish. Their size 
and number lead me to sup- 
pose that there may be an 
anastomosis of the neurites 
of several cells to form one 
fibre of the fibre tract. 
Fig. 2. Longitudinal verti- 
cal section of a portion of the cord 
of Pleuronectes containing a bi- 
nuclear giant cell. 
My further attempts to find the ultimate distributions of the neu- 
rites of these cells will probably be in this species because of the size 
and plainness of the structures and the convenience of obtaining the 
material. 
Achirus lineatus. 
In this form is found the nearest approach to the arrangement 
of cells as found in Lophius. As in Lophius they are massed in 
the anterior part of the cord and become fewer as they are counted 
in each segment caudad. Their numerical distribution may be indi- 
cated by this table: 
Spinal segment Cells 
1—3 147 
4—5 168 
6—7 42 
8—9 22 
10—11 ie. 
12—13 1 
391 total 
