226 The American Naturalist. [March, 
give some light when closely examined. Darwin already mentions 
differences. According to Steindachner, only small specimens 
are found on Jervis Island. Wolf found the specimens from 
Barrington different from those from Charles; they were all- 
smaller and the dorsal spines were not so much developed. There 
is, therefore, evidence that even these semi-aquatic animals show 
some modification on the different islands. 
Conolophus.—This large land form, no specimens of which were 
collected by the “ Albatross,” is so far only recorded from Albe- 
marle, Indefatigable, Barrington, and James. Porter already states 
that it is absent from Charles. Nothing is known about the vari- 
ation of this lizard, few specimens only having been collected. The 
Geckonidz are represented by the genus Phyllodactylus. Charles 
Island contains a peculiar form, P4. galapagoénsis Peters, of which 
the “ Albatross” got one specimen. Two other species are 
recorded by Prof. Cope from Chatham, Ph. tuberculosus Wiegm., 
and Phyllodactylus leet Cope. Ph. tuberculosus would represent 
the only lizard not peculiar to the group, and Chatham would be 
the only island containing two species of the same genus. These 
specimens need reéxamination. 
Snakes —Snakes are much more widely spread over the islands 
than is generally believed. They were first mentioned by 
Dampier. Delano found snakes on Hood; Porter saw “a few 
small snakes much resembling the common American striped 
snake” on James, and “a small gray snake” on Albemarle ; 
Steindachner, who distinguishes two varieties, Dromecus cham- 
issonis dorsalis, and D. habeli records snakes from Indefatigable, 
Hood, Charles, and Jervis. The “Albatross” collected two 
snakes, one on James and one on Gardner Island. According to 
Dr. Habel, snakes are absent from Bindloe and Abingdon. We 
have, therefore, not less than seven islands on which snake#* 
ave been seen. How far the variation in the different islands 
goes is not yet known. 
The Birds—With the birds we are somewhat better acquainted, 
due to the collections of Dr. Habel and the “ Albatross.” The 
first collection forms the material of Mr. Salvin’s extensive 
memoir on the Avifauna of the Galapagos. The material brought 
