= 
~ WILLARD: CRANIAL NERVES OF ANOLIS CAROLINENSIS. 63 
staining medullary sheaths. These fibers are not placed compactly 
together and there is afi appearance as though non-medullated fibers 
lay between them. ‘The second connection of [X with other nerves 
occurs at the level of the distal end of the ganglion. Here the sym- 
pathetic, formed by the union of the “rami communicantes internus 
et externus IX et VII” (comn. 7. and comn. ex.), joins the bundle 
of IX on its ventral side and, after contact and some mingling of 
fibers for the distance of 1/10 mm. becomes free again (Plates 2 and 8, 
figs. 4, 7). (In dissections, no distinction can be made between the 
actual mingling of fibers and inclosure within a common sheath). 
This connection apparently has no relation to the ganglion, for it 
occurs on the ventral side of the ganglion at a point where the most 
distal ganglion cells occupy only the dorsal side. After this contact 
the nerve shows no more connections up to its union with the superior 
laryngeal X. 
The variability in these connections is further emphasized when 
figure K is compared with figs. 4-7, Plates 2,3. In the former the 
first named connection is absent and the second is accomplished by 
| means of a small ramus joining the sympathetic trunk. 
P. VAGUS NERVES 
The central connections of the vagus nerve were less fully deter- 
-|mined than those of the other nerves, owing to the fact that the roots 
are extremely small and the few fibers which each contains do not 
_\keep together within the brain but separate into even smaller bundles 
jor single fibers. There is also some variation as to the number of 
roots that could be identified peripherally. There is considerable 
shifting of central nuclei in the sharp flexure of the hind brain, making 
it impossible to determine conclusively the origin of efferent fibers 
‘from particular cell groups without the aid of the Golgi, or some 
similar method. 
Roots of the vagus. In series 30 (Plates 2, 3, figs. 4-6) the vagus 
-pnters the jugular foramen as three roots (cf. Fig. A). Two of these 
mpear in Plate 7, fig. 20 (ra. X); to avoid confusion of lines, the 
Sie show only one root for each component. Of the three, 
he posterior one contains the deeply staining motor roots; the fibers 
a the other two do not appear to be of uniform character. The middle 
pat is the smallest. The posterior root has its superficial origin along 
