470 DR. R. W. SHUFELDT ON [Nov. 16, 
On the Mode of Insertion of the Patagial Muscles 
of the Pectoral Limb. 
Having considerable faith in the value in classification of the 
arrangement of the insertional extremities of the tendon of the ¢ensor 
patagii brevis muscle, and the forms of the patagial muscles gene- 
rally, as single characters, it was with no little interest that I 
carefully removed with my scalpel the integuments over this region, 
for the first time in my experience in Geococcyx. The late Mr. 
Garrod’s excellent work in this direction is now familiar to all 
ornithologists ; but on this occasion I refrained from consulting any 
of the accurate drawings he has left us illustrating these parts in 
many groups of birds until I had actually completed my dissection, 
and my drawing of it, which is shown in Plate XLIII. fig. 2. I then 
opened his “‘ Collected Scientific Papers” and proceeded to compare 
my figure with his numerous illustrations of the same dissection 
among other birds. 
Being familiar with the arrangement of this tendon in a great 
many North-American birds from my own labours, I was confident 
that the condition of things in Geococcy« californianus was a marked 
departure from anything I had previously met; nor did I expect 
to find anything in Garrod’s illustrations that would prove to 
be exactly like it. But in this last hope I was very agreeably 
disappointed, for I find that it corresponds almost exactly with the 
state of affairs found by this talented anatomist to be present in 
certain Galbulidee. To satisfy one’s self of this fact it is but necessary 
to compare my figure with the Jacamar dissected by Mr. Garrod, 
as shown in his work (plate 23. fig. 1, tendon of tensor patagit 
brevis in Urogalba paradisea), and the striking resemblance will be 
at once appreciated. He has simply cleared his tendon more 
completely of its investing fascia than I have, and still further 
separated its several slips; while in my figure of Geococcyx the 
tendon is shown as it presents itself immediately after turning back 
the integuments, or, in other words, exactly in situ. The liberty 
taken by Mr. Garrod to still further show these slips and their exact 
insertions is perfectly permissible, and often resorted to for the 
purpose named. 
It will be seen that after the tendon of the tensor patagii brevis 
arrives over the proximal third of the belly of the extensor metacarpi 
radialis longior muscle in Geococcyx it trifurcates, one slip passing 
downwards to become inserted immediately below and on the outer 
aspect of the ewtensor carpi ulnaris muscle; the shortest slip at 
once attaches itself to the ewtensor metacarpi radialis longior, while 
the longest division of all passes with the last-named muscle to 
become inserted with it upon the outer condyle of the humerus. 
As for the muscular portion of these patagial muscles above in 
this Ground-Cuckoo, I have represented them with the arm turned 
somewhat differently than the position Mr. Garrod was wont to give 
it. It will be seen, however, that the bulk of this muscular portion 
in oe as in Urogalba, belongs to the tensor patagii brevis 
muscle, 
