466 DR. J. E. GRAY ON THE CHAMELEONID. [Nov. 8, 
Yet the well-fed and fresh-caught specimens seem to vary con- 
siderably in this particular; for example, specimens of C. vulgaris 
from India, as a rule, seem to have the occipital crest higher and 
more arched than African specimens; but still there are in the 
Museum collection some African specimens which have quite as high 
crests. 
Little attention seems to have been paid to the coloration of the 
species, probably because the animal greatly changes its colour during 
life ; and specimens in spirits of some species, such as of C. vulgaris, 
offer many variations, from bright yellow to dark lead-grey. Yet in 
some species the distribution of the colours, at least in specimens in 
spirits, seems to form permanent specific marks, as, for example, 
the lines or white spots or white bands on the sides of several species. 
The number of species has gradually increased. In my Mono- 
graph, published in the ‘Catalogue of Lizards in the British Museum,’ 
printed in 1845, I described eighteen species; the present revision 
contains thirty, distributed into fourteen genera. 
Since the above Monograph, Dr. Hallowell has described three or 
four species from West Africa, in the ‘ Journal’ and ‘ Proceedings’ of 
the Academy of Natural Sciences of Philadelphia ; but unfortunately 
I have not been able to make any of the specimens in the Museum 
collection agree with his descriptions. M. A. Duméril, in the ‘ Ar- 
chives du Muséum,’ has described and figured two new species, and 
he has given figures of the heads of fifteen other species. I have 
referred to these figures, as they elucidate several species described 
in my Monograph which had not before been figured. Unfortu- 
nately the figures are not as accurate as they might be; and one, 
that of C. cucullatus, is either absolutely erroneous or is from a 
Chameleon that differs very considerably in the proportion of the 
head, and in having a dentated crest ou the chin, from the species 
to which M. A. Duméril has referred it, which was originally de- 
scribed by me from specimens in the British Museum collection— 
the account in the ‘Erpétologie Générale’ having been copied from 
my description. 
Dr. Andrew Smith, in the fifth number of the ‘South-African 
Quarterly Journal,’ published at the Cape of Good Hope in October 
1831, describes two new species, viz. C. namaquensis and C. tenia- 
bronchus ; and in the Appendix to his ‘ Zoology of South Africa,’ 
1849, he describes a third, under the name of C. gutturalis. I have 
not been able to identify the two latter. 
Dr. Fitzinger, in his ‘Systema Reptilium,’ published at Vienna in 
1843, is the only author, as far as I know, who has attempted to 
divide the Chameleons into genera. He separates the family into two 
genera—Chameleon, with homogeneous, and Bradypodium with he- 
.terogeneous scales. The rest of the lengthened characters which he 
gives for the genera are only transcripts of one another. He divides 
the first genus into three sections, viz. Chameleon, Triceras, and 
Furcifer. The genera and the sections consist of species which have 
very little affinity, and appear to be very incongruously associated 
together: for example, Furcifer consists of C. bifurcus, C. parsonii, 
