182 JOURNAL OF COMPARATIVE NEUROLOGY. 
ganglia have been fused into a single mass, the limits of whose 
component ganglia cannot always be determined with exact- 
ness. The roots are arranged in the same way as in the other 
fishes, but the sensory members of the complex have been so 
greatly enlarged as to obscure the relations still further by their 
mutual crowding. The enlargement is due in part (i. e., so far 
as concerns the general cutaneous component) to the enormous 
size of the head of the cat fishes and the correspondingly large 
cutaneous surface to be innervated. But the lateralis and es- 
pecially the communis systems are likewise greatly enlarged, 
due to the fact that the pit organs and terminal buds, with which 
nearly the whole surface of the head is abundantly supplied, 
are also innervated from this complex, the communis root sup- 
plying the terminal buds scattered over the trunk also. But 
however much the peripheral relations of these nerves may be 
influenced by the presence and distribution of these sensory 
organs, it remains true that the roots and ganglia maintain the 
strictly typical relations presented by the less highly specialized 
fishes. 
Tt. The motor roots. 
The relations of the motor V and motor VII roots conform 
to previous descriptions and agree with my previous findings in 
Menidia. They are not indicated on the projections, but are 
represented in the series of transections (Figs. 4 to 8). The 
peripheral relations of these nerves have also been fully worked 
out and I confirm the work of my predecessors save in a few 
particulars, which will be mentioned beyond. 
2. The general cutaneous root. 
The fibers of this root enter the spinal V tract, and termi- 
nate in the general cutaneous nucleus, a convenient term in- 
troduced by Houser (’oI, p. 95) for the entire terminal appa- 
ratus of the general cutaneous system. The spinal V tract is 
ill-defined along the mesal aspect and is accompanied by cells 
on this side which represent a part of the terminal nucleus, or 
substantia gelatinosa, as in human anatomy. Following the 
