634 ALLIS. [Vot. XII. 
innervating them, must be, in general, true for the terminal buds 
and the nerves that innervate them. The nerve hillocks, or 
sense organs of the lateral line, are said by Beard (No. 10, 
p. 209) and Wilson (No. 131, p. 244) to arise separately and 
independently along lines of sensory epithelium that either 
differentiate in one or more directions from certain central 
points, or grow directly from such points by cell division. From 
the deeper layers of this sensory epithelium the nerve supply- 
ing the organs of the line arises. Terminal buds and the nerves 
innervating them should therefore arise in this same way. 
The only nerves in Amia from which I have been able to 
trace branches definitely to terminal buds are the ophthalmicus 
superficialis trigemini and the maxillaris inferior trigemini. 
The former of these two nerves in 14 mm. specimens derives 
the larger part, if not all, of its fibres from the median part of 
the trigemino-facial ganglion, that is, from that part of the 
ganglion that is formed on, or in connection with, the fascicu- 
lus communis root. From this same part of the ganglion a 
large bundle of fibres is sent to the truncus maxillaris trigem- 
ini; from it arises also the ramus palatinus facialis, which is 
distributed in Amia to a region covered with terminal buds, 
and which in Rana innervates such buds (No. 121, pp. 121 and 
123); and from it also a bundle of fibres is possibly sent to the 
truncus hyoideo-mandibularis facialis, as is said to be the case 
in Rana and Amblystoma, in which animals it gives origin, 
according to Strong, to the ramus mandibularis internus fac- 
ialis, which nerve in Rana innervates terminal buds (No. 121, 
pp. 130, 132, and 195). I was unable to definitely trace this 
bundle of fibres in Amia into the truncus hyoideo-mandibularis, 
and the mandibularis internus in larvae of Amia, through the 
full length of its course, never passes near a region where ter- 
minal buds are numerous. In the lining membrane of the 
mouth cavity, internal to the hyomandibular, and hence not 
far from the truncus hyoideo-mandibularis, there are many 
buds, but the pretrematic branch of the glossopharyngeus runs 
near them, and branches of that nerve are found extending 
toward them. It is therefore, in all probability, that nerve 
and not the mandibularis internus that innervates them. 
