8 A Review of the Muscles used 
above described, to the upper margin of the extensor meta- 
carpi radialis longus muscle, at an exactly similar spot : 
it does not, however, simply blend with the fibrous origin 
of that muscle : it becomes attached to it at the spot indi- 
cated, and then (again considering the forearm as _ half 
bent upon the humerus) runs back independently to be at- 
tached to the base of the tubercle of origin of the extensor 
met. rad. longus, slightly below that muscle’s springing-— 
point. As a consequence of this arrangement there are 
two tendons to be seen running to one spot (that on the 
upper margin of the extensor met. rad. longus, where the 
tendon of the tensor meets it) from two points, one the. 
apex of the tubercle on the humerus above referred to, 
and the other, the depression at its base. These tendons 
therefore converge as they leave the elbow, having at first 
an appreciable interval between them, which is gradually 
diminished as they approach, although they remain quite 
free from one another, that of the tensor being superfi- 
cial.” 
As I have already stated above, the insertion of this mu- 
scle is vastly different from that in other orders of birds, 
and some differences even occur among the passeres them- 
selves, especially when we come to examine the more aber- 
rant types of this vast group. 
3. The dermo-tensor patagi (See figures 2 and 3 dt. p.) It 
is but a few weeks ago since I originally described this muscle 
(Sczence, No. 229, pp. 628,624, and 234, p. 57),and as I have 
not further investigated it since then, my remarks upon it 
can very appropriately be reproduced here. Of it, I said sub- 
stantially that among my manuscripts in the hands of pub- 
lishers, I have some very extensive work upon the my- 
ology of birds, illustrated by nearly a hundred original draw- 
ings ; and, as many of my friends are aware, I have been 
engaged for a number of months past upon my second con- 
tribution to the anatomy of the Macrochires, a work now 
drawing towards completion. Quite recently, while inves- 
tigating the muscular system of the Hirundinidae, in this 
latter connection, I discovered, in the course of my dissec- 
tions, a muscle for which at this moment I recall no pub- 
