THE SKULL IN THE CHAMELEONS. 103 
With many Birds the Chameleon agrees in the position of the nasal glands, which is 
a correlate of the azygous vomer, and the suppressed septo-maxillaries: yet many Birds 
have two vomers originally ; the Chameleon has only one from the first. 
In mere form, the head of the Chameleon resembles that of many high-skulled 
Teleostean Fishes ; but the height is obtained by very different methods in the two types 
of skull. 
In conclusion, it is self-evident that the Chameleons are a very isolated group of 
Lizards. Like Snakes, they are low in certain respects, and yet in others are specialized 
to the utmost. 
List oF ABBREVIATIONS. 
The Roman figures in the Plates indicate the nerves or nerve-foramina. 
ag. Angular. ep. Epiotic. 
al.n. Alinasal. e.pa. Ethmopalatine. 
al.s. Alisphenoid. e.st. Extrastapedial. 
al.s. f. 
al.sp. Aliseptal. f. Frontal. 
ar. c. Articular condyle. f. m. Foramen magnum. 
a. s.c. Anterior semicircular canal. fo. Fontanelle. 
au. Auditory sac. f. 0. Fenestra ovalis. 
b.hky. Basihyal. h.hy. Hypohyal. 
b.hy’. Additional basihyal. h. s.c. Horizontal semicircular canal. 
6.0. Basioccipital. zi. n. Internal nostril. 
b.pg. Basipterygoid. i.0. f. Interorbital fenestra. 
.s. Basiphenoid. ip. Interparietal. 
C. Fore brain. 7. tb. Inferior turbinal. 
C?, Mid brain. j. Jugal. 
C*. Hind brain. 1. Lacrymal. 
c.br. Ceratobranchial. 1. c. Lacrymal canal. 
e.hy. Ceratohyal. mk. Meckel’s cartilage. 
co. Columella. m.st. Mediostapedial. 
er. Coronoid. mx. Maxillary. 
c. tr. Cornu trabecule. n. Nasal. 
d. Dentary. n. f. Nasal floor. 
e. n. External nostril. n. g. Nasal gland. 
é.0. Exoccipital. n. px. Nasal process of premaxillary. 
Alisphenoidal fenestra. 
e.st. f. Extrastapedial fenestra. 
