Henry L. Bruner 115 
EXPLANATION OF FIGURES. 
IPPATHOE 
Fic. 1. Transverse section through the parotic process of Phrynosoma, 
showing the general relations of the m. constrictor vene jugularis interne. 
xX 6. 
A., Atlas; m. ¢c. c., m. capiti-cervicalis; m. c. 7. i., m. constrictor vene jugu- 
laris interne; m. d. m., m. dorso-mandibularis; m. o. ¢c. 1l., m. occipito-cervi- 
ecalis lateralis; O. c., occipital condyle; Par., parietal bone; Q., quadrate; 
Sq., squamosum; S?#., supratemporale. 
Fig. 2. Musculus constrictor vene jugularis interne of Phrynosoma. 
Transverse section near Fig. 1. > 16. 
ep., epithelium of pharynx; m. c. 7. 7., m. constrictor vene jugularis inter- 
ne; the lumen of the vein is somewhat reduced by contraction of the muscle; 
Ol., occipitale laterale; St., supratemporale; thy., thymus gland; v. c. p., vena 
cerebralis posterior; 7X, X, X/JJ, cranial nerves. 
Fie. 3. Transverse section of the m. constrictor vene jugularis interne of 
Lacerta agilis, showing attachment of the muscle. x 20. 
Ep., second epibranchial cartilage of Parker; m. c. 7. i., m. constrictor vene 
jugularis interne; Ol., occipitale laterale; r. c. e., ramus communicans externus 
n. glossopharyngei cum n. faciali; r. c. i., ramus communicans internus n. 
glossopharyngei cum n. faciali; r. v., pars ventralis of the ramus communicans 
pn. glossopharyngei cum n. maxillari; r. p. f., ramus posterior facialis; St., 
supratemporal bone; v. c. p., vena cerebralis posterior; v. j. i., vena jugularis 
interna; v. m., vena mandibularis; 7X, X, XJ, cranial nerves. 
Fic. 4. Transverse section of head of Lacerta agilis through the posterior 
part of the m. protrusor oculi. X 10. 
a. f., arteria facialis (temporo-muscularis); m. p. 0., m. protrusor oculi; 
m. t., m. temporalis; Ps., parasphenoid bone, above which lies the basis 
cranii, formed by the united trabecule cranii of the chondrocranium; Pt., 
pterygoid bone; r. c. m., ramus communicans n. glossopharyngei cum n. 
maxillari; r. d. p. 7., ramus ad m. depressorem palpebre inferioris; r. m., 
ramus mandibularis V; 7. m., tenia marginalis of chondrocranium; 7. p. m., 
tenia parietalis media of chondrocranium; v. 7. i., vena jugularis interna; 
v. pt., vena pterygoidea; v. st., vena supratemporalis. 
Fic. 5. Tranverse section of Lacerta agilis, through anterior part of the 
m. protrusor oculi. XX 25. 
g. r. f.. ganglion of ramus frontalis ophthalmicus V; m. b., m. bursalis; 
Mm. p. O., m. protrusor oculi; m. r. o., m. retractor oculi; m. t., m. temporalis; 
Ps., parasphenoid bone, above which lies the basis cranii, a cartilage formed 
by the union of the trabecule cranii; r. d. p. i., ramus ad m. depressorem 
palpebre inferioris; S. 7., subiculum infundibuli of chondrocranium; s. V., 
secondary connection of the vena cerebralis media; ¢., fibrous sheet which 
connects the two mm. protrusores oculi; ?#’., fibrous band by means of which 
the m. protrusor oculi inserts on the cartilaginous basis cranii; v. 7. i., vena 
jugularis interna. 
