ON THE ANATOMY OF PASSERINE BIRDS. 379 
60. NOTES ON THE ANATOMY OF PASSERINE BIRDS. 
Part IV.* 
In my “ Notes on the Anatomy of Passerine Birds,” Part II., whilst Page 143. 
discussing the systematic position of the Eurylemide, I mention that 
the method of insertion of the tensor patagii brevis muscle of the arm 
is unknown.t Through the kindness of Lieut.-Colonel Godwin- 
Austen, who has placed at my disposal carbolized specimens of 
Psarisomus dalhousie and Serilophus rubropygius, I have recently had 
the opportunity of dissecting these species, and am now able to state 
that in both of them the tendon of the tensor patagii brevis is perfectly 
Passerine, agreeing precisely with the typical arrangement previously 
described by me in the Order{—the two tendons which traverse the 
distance between the point where the main tendon joins the extensor 
metacarpi radialis longus and the elbow running independently and 
parallel as they course to their humeral attachment. 
In neither specimen was I able to dissect out the plantar tendons, 
because they were so dry and brittle that no amount of soaking would 
render them fit for observation. I was, however, able to determine 
some other anatomical points, including the existence of a single 
carotid artery (the left), a normal disposition of the vessels of the 
thigh (the main artery of the leg being the sciatic), the considerable 
size of the femoro-caudal, of the semitendinosus, and of the accessory 
semitendinosus, and the absence of the accessory femoro-caudal and 
of the ambiens muscles. 
Previous evisceration, I regret to say, prevents my adding any 
thing with reference to the syrinx and the abdominal viscera; never- 
theless I think that now the vomer and the tensor patagii brevis are 
known to conform exactly with the Passerine type, all shadow of 
doubt as to the perfectly Passerine structure of the Eurylemide may 
be dismissed, notwithstanding the aberrant vinculum joining their 
deep flexor tendons. 
So far as its sternum is concerned, Psarisomus dalhousie so closely 
resembles Eurylemus javanicus, as figured by Mr. Sclater in “‘ The 
_Ibis,”§ that no further remark with reference to it is necessary, 
except to draw attention to the unforked condition of the manubrium. 
My specimen of Serilophus was too much shot for me to make out its 
sternal peculiarities. 
* “ Proceedings of the Zoological Society,” 1878, p. 143. Read, Feb. 5, 1878. 
t “Proceedings of the Zoological Society,” 1877, p. 449. (Supra, p. 370.) 
I “Proceedings of the Zoological Society,” 1876, p.508 (Supra, p. 356.) 
§ Third Series, vol. ii., 1872, p. 179. 
