748 ALLIS, [Vou. XII. 
their development. They and the nerves innervating them 
should, therefore, arise from, or in connection with, sensory, 
ectodermal thickenings, as do the canal organs and their nerves. 
Certain pharyngeal or pretrematic nerves are known to inner- 
vate certain terminal buds, and the pharyngeal and pretre- 
matic branches of all the cranial nerves are said to arise from, 
or in connection with, epibranchial or pretrematic ectodermal 
thickenings. Terminal buds should, therefore, arise from, or 
in connection with, those same thickenings. 
Those trigeminal and facial nerves, in Amia, that are known 
to innervate terminal buds, or that innervate regions where 
those buds abound, all arise either from the median, fascicu- 
lus communis portion of the main trigemino-facial ganglion, 
or receive important additions to their fibres from that portion 
of that ganglion. It seems, therefore, probable, as Strong has 
suggested, that the fasciculus communis tract of the brain is 
largely or entirely concerned in the innervation of terminal 
buds. The arrangements presented by different fishes indi- 
cate that the fibres of this tract may issue from the brain as 
a somewhat separate root, and have a somewhat separate gan- 
glion, or that they may issue as parts of the roots of certain of 
the cranial nerves, their ganglia, in that case, being completely 
fused with the ganglia of the nerves with which they issue. 
The nerves, their ganglia, and the organs they innervate thus 
form an epibranchial or pretrematic series comparable to the 
nerves, ganglia, and organs of the lateral or dorso-lateral series. 
The organs and nerves of the epibranchial series are formed 
before those of the lateral series, for the nerves of the former 
lie always below those of the latter, and may hold them be- 
tween branches issuing on both sides of them. 
26. The eye is said to belong to the line of epibranchial 
thickenings. The lens of the eye may, therefore, be a modified 
terminal bud or buds, and one or more of the ciliary nerves 
the nerve innervating it. 
27. The chorda tympani is distributed to the tongue, and 
contains taste fibres. As taste bulbs are supposed to be 
developed from terminal buds, the chorda probably belongs, in 
part, at least, to the fasciculus communis nerves. AS itis 

