willard: cranial nerves of anolis carolinensis. 99 



end organs, or peripheral terminations, through the following nerve 

 trunks; Somatic sensory (yellow), via nerve V, over ophthalmic 

 (rmm. frontalis and nasalis), maxillary and manbibular rami. Somatic 

 motor (light blue), via nerves III, IV, VI, and XII. Viscerosensory 

 (red), via nerve VII over the palatine ramus and the chorda tympani; 

 via nerve IX over the pharyngeal ramus and probably Jacobson's 

 anastomosis; via nerve X over the superior laryngeal and recurrent 

 rami. Viscero-motor (dark blue), via nerve V by a number of inde- 

 pendent rami and over the mandibular ramus; via nerve VII over 

 hyomandibular division and ramus hyoideus; via nerve IX over the 

 pharyngeal ramus; and via nerve X over the superior laryngeal ramus. 



(a) This shows a greater reduction of the somatic sensory (as 

 indicated by peripheral paths) in iVnolis than is found in the described 

 forms of other groups, such components not being found in nerves IX 

 or X of Anolis although their presence in the same nerves has been 

 reported in each of the other classes of vertebrates. 



(b) Vestigial ganglia exist in a variable manner on the intra- 

 cranial roots of X, which may be somatic sensory in their origin. 



5. The morphological character of the fibers of different com- 

 ponents is sufficiently differentiated to form types peculiar to each 

 component. But the distinction in character appeared to be less than 

 that described for the lower groups of vertebrates. However, there 

 was considerable individual variation in the size of fibers. Nerve 

 XII shows a marked difference in the size of the fibers going to 

 neck muscles and those going to tongue muscles. In this case the 

 smaller fibers have much the longer course. In at least three instances 

 striated muscle fibers of visceral origin are innervated by nerve fibers 

 of smaller caliber and lighter myelin sheaths than is characteristic of 

 the other viscero-motor components of V, VII, IX, and X. These 

 are the ciliary muscle, the protrusor oculi, and the constrictor of the 

 jugular vein, all of which are more closely associated with visceral 

 functions than the other striated visceral muscles. 



6. The skin is well-supplied with special tactile organs, which are 

 more abundant along the jaws than elsewhere. These organs are 

 quite generally, if not always, covered by a thinned plate of the horny * 

 layer of the epidermis, which bears in its center a tapering "hair." 

 The innervation of these hairs was not determined beyond the fact 

 of the proximity of the strongly myelinated cutaneous fibers in the 

 dermis beneath. 



7. The distribution of taste buds is such as to preclude their 

 innervation (save a very limited number in the laryngeal region) by 



