344 Zoological Society : — 



11. Ensirostrts. Nose-horn single, bony, central, sharp- edged 

 above ; occiput lobed behind ; back with a lobed, erect fin. 



12. Sauroceras. Nose-horn single, bony, central, sharp-edged 

 below, grooved above ; occiput simple behind ; back dentate. 



13. DiCRANOSAURA. Nosc-homs two, produccd, comprcsscd ; back 

 compressed ; belly and chin rounded. 



14. Cyneosaura. Nose dilated, and toothed on each side in front; 

 back, chin, and belly dentate. 



A. Nose of male and female simple, not dilated ; orbit simple. 



1. Chameleon. 



Nose (of both sexes) simple, without any appendages or horns ; 

 the chin simple ; orbit round, simple. The back, chin, and belly 

 with a series of compressed elongated scales, forming a dentated crest. 



a. Occiput produced and acute behind, with raised central keel, with 



small scales behind the temples. Calyptrosaura. 



1. Chameleon calyptratus, A. Dum. Arch, du Mus. vi.t. 21. 

 f. 1. 



The occipital ridge very high and large ; scales equal, small. 

 Hab. Madagascar {Mus. Paris.). 



I only know this species from the description and figure of M. A. 

 Dumeril. 



2. Chameleon verrucosus, Gray, Cat. B. M. 267 ; Dum. & 

 Bib. Erp. Gen. iii. t. 27. f. 1. B.M. 



Bradypodium verrucosum, Fitz. Syst. Kept. 43. 

 Scales unequal ; sides with several series of larger tubercles. 

 Hab. Madagascar. Males and females similar. 

 The series of scales on the belly and chin becomes less distinct in 

 the older specimens. 



b. Occiput produced and acute behind, with a raised central keel 



and with a flat space edged with a series of large scales, from 

 the apex to the sides of the temple. Chamaeleon. 



3. Chameleon vulgaris, Gray, Cat. B.M. 265; A. Dum. Arch, 

 du Mus. vi. t. 22. f. 1 (head). B.M. 



The occipital crest moderate, upper edge arched ; the side margin 

 with a series of large scales, and more or less elevated ; scales equal. 



In spirits, brown, with two more or less interrupted pale longitu- 

 dinal bands on each side ; eyelids dark-rayed. 



Hab. Africa and Asia ; and naturalized in Europe. 



Var. marmoratus. Forehead very concave ; eyebrows and occi- 

 pital crest very high. In spirits, pale brown, marbled with irregular 

 black cross marks. 



Hab. Dukhun {Col. Sykes). 



In the British Museum there are specimens from S. Europe (P. 

 B' Well); N. Africa, Egypt {J. Burton), Algiers and Tunis {Eraser), 



