32 
ZOOLOGICAL GEOGRAPHY. 
[part hi. 
to the mainland. Taking the six islands which seem tolerably 
explored, we find that two of the species (Dendrceca aureola and 
Geospiza- fortis) occur in all of them; two others ( Geospiza 
strenua and Myiarchus magnirostris) in five ; four {Minus 
melanotis, Geospiza fuiiginosa, G. parvula , and Camarhynchus 
prosthemelas) in four islands; five ( Certhidea olivacea, Caetornis 
scandens , Pyrocephalus names), and two of the birds of prey, in 
three islands ; nine (Certhidea fusca, Progne concolor , Geospiza 
nebulosa, G. magnirostris, Camarliynchus psittaculus, C. variegatus, 
C. habeli and Asio accipitrinus) in two islands; while the remaining 
ten species are confined to one island each. These peculiar 
species are distributed among the islands as follows. James, 
Charles and Abingdon islands, have 2 each ; Bindloes, Chatham, 
and Indefatigable, 1 each. The amount of speciality of James 
Island is perhaps only apparent, owing to our ignorance of the 
fauna of the adjacent large Albemarle island ; the most remote 
islands north and south, Abingdon and Charles, have no doubt 
in reality most peculiar species, as they appear to have. The 
scarcity of peculiar species in Chatham Island is remarkable, it 
being large, very isolated, and the nearest to the mainland. 
There is still room for exploration in these islands, especially in 
Albemarle, Narborough, and Hood’s islands of which we know 
nothing. 
Reptiles . — The few reptiles found in these islands are very 
interesting. There are two snakes, a species of the American 
genus Herpetodryas, and another which was at first thought to 
be a Chilian species (Psammophis Temminchii ), but which is 
now considered to be distinct. Of lizards there are four at least, 
belonging to as many genera. One is a species of Phyllodactylus , 
a wide-spread genus of Geckotidse; the rest belong to the 
American family of the Iguanas, one being a species of the Neo- 
tropical genus Leiocephalus, the other two very remarkable forms, 
Trachycephalus and Oreocephalus (formerly united in the genus 
Amblyrhynchus). The first is a land, the second a marine, lizard ; 
both are of large size and very abundant on all the islands ; and 
they are quite distinct from any of the very numerous genera of 
Iguanidse, spread all over the American continent. The last 
