104 PROF. W. K. PARKER ON THE STRUCTURE OF 
oc. c. Occipital condyle. px. Premaxillary. 
op. Opisthotic. py. Pituitary space. 
0.s. Orbitosphenoid. gq. Quadrate. 
ot. p. Otic process. s.ag. Surangular. 
p. Parietal. s. n. Septum nasi. 
pa. Palatine. s.o. Superoccipital. 
pa.s. Parasphenoid. sp. Splenial. 
p. .c. f. Posterior basicranial fontanelle. sq. Squamosal. 
p. ée. Middle ethmoid. s.st. Suprastapedial. 
p.f. Prefrontal. st. Stapes. 
pg. Pterygoid. s.€. Supratemporal. 
pr.o. Prootic. t.pa. Transpalatine. 
p.s. Presphenoid. v. Vomer. 
p. s. ¢. Posterior semicircular canal. vb. Vestibule. 
pt.o. Postorbital. 
DESCRIPTION OF THE PLATES. ~ 
PLATE XV. 
Fig. 1. Chameleo vulgaris: ripe young, 14 inch long, head } inch, tail 3. The skull, 
side view, X 134 diameters. 
Fig. 2. The same, lower view, x 134 diam. 
Fig. 3. The same, upper view, x 134 diam. 
Fig. 4. The same, end view, x 134 diam. 
Fig. 5. The hyo-branchial arches, upper view, X 134 diam. 
Fig. 6. The mandible, inner view, x 134 diam. 
Fig. 7. The endocranium, side view, x 134 diam. 
Fig. 8. The same, upper view, x 134 diam. 
PLATE XVI. 
Fig. 1. Chameleo vulgaris: adult female. The skull, side view, x 32 diam. 
Fig. 2. The same, lower view, x 3? diam. 
Fig. 3. The same, upper view, x 3} diam. 
Fig. 4. The same, end view, x 33 diam. 
Fig. 5. The same species: large male. 
The skull and brain im situ, longitudinally 
vertical section, x 3? diam. 
Fig. 6. The same. Hyo-branchial arches, upper view, x 32 diam. 
Fig. 7. The same. Quadrate bone and columella, x 74 diam. 
