WILLARD: CRANIAL NERVES OF ANOLIS CAROLINENSIS. 43 
passes through this muscle and is distributed to the ventral skin 
region. Three branches of spinal nerves are shown to innervate the 
eucullaris muscle; their precise relation to particular spinal nerves 
was not determined owing to apparent anastomoses of rami. No 
relation that would suggest an innervation from a spinal accessory 
nerve was established with any nerves anterior to spinal IT. 
M. laxator tympani of Versluys (lax. tym.). A very small muscle, 
less than one half mm. in length, extends caudad from the insertion 
of the tympanic ligament on the extra-columella (Plate 7, figs. 21, 22). 
Its fibers end on the connective-tissue covering of the parotic process. 
The motor component of nerve VII passes ventral to the posterior end 
of this small bundle and in contact with it. The series of sections did 
not show with certainty the innervation of this muscle from motor 
VII, but a few fibers are given off from the main nerve bundle which 
in all probability accomplish such innervation. This is the more 
probable because there is no other nerve in the vicinity. Owing to 
its minute size this muscle was not isolated in dissection, but is a 
: constant feature of the sections. 
This muscle was first described by Versluys (’98) and given the 
name descriptive of its function. He found it in a number of lizards, 
_ all members of the family Gecko- 
nidae, while he failed to discover Spit, mephy-lar. 
it in as many others, which be- 
longed to different families. No 
more positive statement of its in- 
‘nervation than is here given for 
Anolis is contained in Versluys’ s 
account. 
_ M. constrictor venae jugularis Fk X x 
imternae ot Bruner (co’st. vn. 7. 7.). . 
Pea 
Jar.su. 
COMM. LX. 
{commn.t. 
In Anolis this muscle is found in OM bt ee 
relations similar to those described 
: Fic. K.— Frontal projection, dorsal as- 
oy Bruner (: 07, p. 42) for Phryno- pect, of nerves IX and X of the left 
oma. These striate muscle fibers side, showing the region of the roots 
urround the internal jugular vein and ganglia only, together with their 
connections. Plotted from Anolis, 
or a distance of 84 mm. The transverse series 48a. Two tumefac- 
ost anterior fibers, for a distance tor nerves (rm. vn. j.) are given off 
} from the ramus pharyngo-laryngeus 
f 14 oo » have their origin from and one from ue ramus superior 
he most posterior portion of the laryngeus. 
arotic process (Plate 7, fig. 23, 
re. pa’ot.) and from the ligamentous extension of it. These anterior 
