DESCRIPTION OF PLATE 22. 
A. Right side, seen from inside. 
1. Spheno-palatine muscle. 
Spheno-pterygoid muscle. 
Sphenoid crest. 
BW bp 
dibular portion. 
wn 
dibular portion. 
Supermaxillary bone. 
Mandibular bone. 
Poison fang. 
Palatine bone. 
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10. Internal pterygoid bone. 
11. External pterygoid bone. 
12. Parietal bone. 
13. Squamosal bone. 
14. Quadrate bone. 
15. Premaxillary bone. 
16. Prefrontal bone. 
17. Post-orbital process. 
B. Right side, seen from outside. 
Posterior portion. 
dibular portion. 
nN ABwWNH 
dibular portion. 
7. Supermaxillary bone. 
8. Mandibular bone. 
Ome nits 
10. Fang. 
11. Internal pterygoid bone. 
12. Palatine bone. 
13. Parietal bone. 
14. Post-orbital process. 
15. Prefrontal bone. 
16. - Premaxillary bone. 
17. Quadrate bone. 
18. Squamosal bone. 
C. Head of water mocassin (Ancistrodon 
piscivorus) seen from above. Skin 
removed except near snout. 
1. Poison gland. 
2 
Ending of the anterior temporal 
muscle in capsule of poison 
gland. 
3. Mandibular portion of anterior 
temporal muscle. 
4. Attachment of the middle tem- 
poral muscle to the tempo- 
parietal region of cranium. 
Posterior temporal muscle. 
Internal suspensory ligament of 
oe 
poison gland. 
Posterior ligament. 
Digastric muscle. 
Poison fang. 
Pits 
woe 
tO aco! 
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Anterior temporal muscle, man- 
Posterior temporal muscle, man- 
External pterygoid muscle. 
Spheno-palatine muscle. 
Spheno-pterygoid muscle. 
Posterior temporal muscle, man- 
Anterior temporal muscle, man- 
External pterygoid muscle. 
12. 
mas 
I4. 
Io. 
If. 
12. 
133 
T4. 
TGs 
16. 
E. Right 
Tes 
Ww 
> 
Om 
10. 
Ii. 
Ls 
Te 
T4. 
15. 
Shield scales. 
Eye. 
Cervical muscles. 
D. Right side, seen from outside. 
Poison gland. 
Duct of poison gland. 
Internal suspensory ligament of 
gland. 
Posterior suspensory ligament. 
Anterior temporal muscle. 
Insertion of anterior temporal 
muscle around the poison 
gland overlapping from behind 
and ending in the capsule. 
Posterior temporal muscle, man- 
dibular portion. 
Posterior temporal muscle, cra- 
nial portion. 
. Middle temporal muscle, at- 
tachment to the parietal bone. 
The fibers end in a fan-like, 
spreading layer over anterior 
temporal muscle. 
External pterygoid muscle. 
Origin of the external ptery- 
goid muscle. 
Spheno-palatine muscle. 
Digastric muscle. 
Supermaxillary bone. 
Internal pterygoid bone. 
Mandibular bone. 
side, seen from inside. 
Poison gland. 
The duct of poison gland. 
Mandibular portion of the an- 
terior temporal muscle. 
Upper portion of the anterior 
temporal muscle enveloping 
posterior region of gland. 
Cut edge of the middle tem- 
poral muscle. 
Middle temporal muscle; the 
upper torn edge is detached 
from the parietal bone to 
which it has been inserted. 
The lower cut edge is originally 
continuous with the fibers 
shown in the opposite cut edge 
through a short piece of the 
removed portion. 
Posterior temporal muscle. 
Upper portion of the posterior 
temporal muscle. 
External pterygoid muscle. 
Its anterior portion. 
Spheno-pterygoid muscle. 
Spheno-palatine muscle. 
Digastic muscle. 
internal suspensory ligament. 
A portion of posterior ligament 
of poison fang. 
