WILLARD: CRANIAL NERVES OF ANOLIS CAROLINENSIS. 77 
nerves will be given. It is based on the details of this nerve complex 
as worked out in six cases, and gives the features common to all. 
There is much variation in the details of the connection between 
nerves [1X and X. Without reference, for the time being, to the anas- 
tomoses of uncertain significance, the essential features of the two 
nerves may be stated as follows: 
(a) Nerves IX and X arise each by several separate roots, at least 
one root of each nerve being motor. The component character of 
each nerve appears to be the same, although X exceeds IX in the 
number of both its sensory and motor components. The ganglion 
of IX (Plates 2, 7, figs. 4, 23) lies some distance from the brain, as 
already stated, and probably is not strictly homologous with the 
ganglion of X, the jugular, which is just outside the foramen. 
(b) The coarser motor fibers in each case are readily seen to pass 
through their respective ganglia. 
(c) There is a postganglionic division of each nerve which results 
in each case in two bundles; a bundle of mixed coarse and fine fibers 
| and a bundle composed exclusively of fine fibers. 
(d) The mized bundles come together (as pharyngo-laryngeal 
branch) and then join XII for distribution on the floor of the pharynx. 
| (e) The fine fibered bundle of IX is very small and joins the sym- 
pathetic trunk, from which it may later separate, along with sympa- 
thetic elements, to reach palatine VII. 
(f) The purely sensory bundle of X is a large one, and passes caudad 
\to its trunk ganglion, ganglion nodosum (gn. nd.); it then divides 
(Fig. L) to form the ramus recurrens X and the ramus visceralis dis- 
\tributed to the lungs, heart and alimentary canal. 
(g) In all cases studied except one [X and X show an anastomosing 
ramus (Fig. 4, comn. [X—X) which connects a preganglionic peint of 
IX with a postganglionic point of X. The one exception is shown in 
Figure K, already referred to, where there is no connection whatever 
between IX and X proximal to the union of the pharyngeal and laryn- 
geal rami. 
). A VESTIGIAL DORSAL GANGLION ON THE Roots OF THE VAGUS. 
There was found in several cases in Anolis a very small group of 
sanglion cells situated on the dorsal side of one of the roots of nerve X. — 
Such gangla were studied in three cases. In two cases they were situ- 
‘ted upon the largest, most posterior root, which carries the motor 
ie In the third case the ganglion, being smaller than in the others, 
egy of only three or four cells located on the small middle root. 
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