1 86 Journal of Comparative Neurology. 



The giant ganglion cells of Ctenolabrus form a single me- 

 dian longitudinal row in the dorsal portion of the cord, lying 

 within the dorsal fissure with their upper surfaces flush with the 

 dorsal limit of the cord, and covered by the membrana prima, 

 (fig. 3). Each cell lies within a capsule formed of three ele- 

 ments, — (i) the membrana prima which is arched above each 

 cell, (fig. 5, nib. p. 190), (2) the neuroglia fibers {n.f.), which 



Fig. I — Diagrammatic parasagittal section of the raeflulla and anterior part 

 of the cord of Ctenolabrus, showing the arrangement of the giant ganglion cells 

 and the course of their neurites. The lateral bundle {l.f.b.) and the lateral cells 

 {a) are projected on the median plane. The canalis centralis is shown in 

 dotted lines, fis.rb. fissura rhomboidalis ; cbl. cerebellum ; hyp. hypoaria. 



opt. I. 



Fig. 2. — Diagrammatic frontal section of same, the cells and lateral fiber 

 bundles projected on a plane. Opt. I. optic lobe. 



come off from the membrana prima and extend downward to the 

 canalis centralis, (3) the fine neuroglia network, («.«.). The 

 capsules have an internal diameter of one and a half to two 

 times that of the cell, so that each cell is surrounded by a space, 



