1897.] Birds of the Galapagos Archipelago. 777 
In the first appearance of the hair Maurer sees additional 
evidence in favor of his view. We have already alluded to 
the rows in which the earliest hairs are arranged. Maurer 
finds that the first tactile hairs to appear are arranged in the 
following rows: (1) supraorbital ; (2) infraorbital ; (3) zygom- 
atic; (4) angular; (5) upper lip; (6) under lip ; and (7) submen- 
tal; and that these rows follow in a striking way, the course of 
the tegumentary branches of the tregeminal nerve. The other 
hairs are not irregularly arranged but are also in regular rows 
(see fig. 4) and, thinks Maurer, these rows are closely connected 
with the rows of sensory organs in the Amphibian skin. The 
grouped arrangement of hairs is secondary and the point of 
origin of a group is a single hair the follicle of which by bud- 
ding gives rise to other follicles and hence to the hair group. 
Such a means of increase is found no where else than in the 
sensory organs of the Ichthyopsida. 
It would be interesting did space permit to go farther into 
this subject and to take up other tegumentary structures. It 
is, however, hoped that this brief review will lead to the read- 
ing of Keibel’s summary already referred to with its biblio- 
graphy of over one hundred titles. 
BIRDS OF THE GALAPAGOS ARCHIPELAGO: 
A CRITICISM OF MR. ROBERT RIDG- 
WAY’S PAPER. 
By G. BAUR, 
UNIVERSITY OF CHICAGO. 
On the 30th of March, Mr. Ridgway published a paper on 
the “ Birds of the Galápagos Archipelago,” in which he makes 
the following remarks in regard to the genus Geospiza : 
“ Few genera equal the present one in the extreme modifi- 
cations in the form of the bill, which in some species (magni- 
sae and strenua) is, perhaps, not excelled by that of any 
roc. U. S. Nat. Mus. (No. 1116), Vol. XIX, p. 459-560, Pl. LVI-LVII, 
Washo, 1896. 
