Howard Ayers and Julia Worthington 329 
any cell, and apparently without connecting with the epithelial cells in 
any way (Figs. 1 and 2) ; others, after running out a little way through 
the epidermis, turn and run parallel to the basement membrane, giving 
out in their course numerous fine fibrils that run, some mesad, some ectad. 
Some of these fine fibrils end in contact with cells, others, apparently, 
end free between the cells. Fig. 1, drawn from the common territory, 
also illustrates these relations as they exist in the tentacles. 
Fic. 1. Cross-section of skin of adult Bdellostoma through territory inner- 
vated by both trigeminus and lateralis fibers. Golgi preparation. 6b —=base- 
ment membrane, @ = dermis, ep = epidermis, G = ganglion cell, i= inner layer 
of epidermis, m—mucous cell, md—middle layer of epidermis, 0 = outer 
layer of epidermis, s—=sensory cell. X 153. 
Nerve end cells—The single cells in connection with which trigeminus 
fibers end, may be divided roughly into two classes, large cells and small 
cells. The small cells (Fig. 3) occur in either the inner or middle layers, 
and are very numerous. Many of them are oval, though some are conical 
as in Fig. 3, and taper to a sharp point at the apex. The nerve comes in 
contact with these cells at their proximal end ; sometimes it forks (Fig. 3), 
sending a branch to he against the cell on either side, sometimes it forms 
a small plate at the base of the cell, and sometimes it appears to penetrate 
