On the Anatomy §c. of the Colies. 229 
“ Acrobatic” display. It has been witnessed on different 
days to his “ Juggling” display. While giving his Acrobatic 
performance he sings the whole time, but never shews his 
side-plumes ; and when he is in the pendulous position 
his body sways gently as if it were influenced by a fitful 
breeze. The whole of this performance takes but a very few 
seconds. 
The drawings by Mr. G. E. Lodge (Plate V. and text- 
figures 8 & 9) were sketched from life, the bird having given 
him a continuous exhibition of his display of nearly an 
hour’s duration. 
X.—On the Anatomy and Systematic Position of the Colies. 
By W. 2. Pyersrry FZ.S)4 .S., M.B.O.U., &c. 
I. Introduction, p. 229. IV. Osteology, p. 240. 
Il. Pterylography, p. 230. V. Summary, p. 249. 
Il. Myology, Syrinx, and Intes- | VI. References to previous Works, 
tinal Conyolutions, p. 237, p. 253. 
I. Inrropvuction. 
WueENn, some months since, Dr. Sclater asked me to con- 
tribute a paper to ‘The Ibis’ on the anatomy of the Coles, 
with especial regard to the systematic position of these 
aberrant birds, it seemed to me that little that was new 
remained to be said. For, in addition to Dr. Murie’s 
monograph on the skeleton (11) which appeared in ‘The 
Ibis’ so far back as 1872, a number of contributions have 
been made by other writers dealing with the ptery losis, 
myology, and intestinal convolutions. 
Nevertheless, I have been enabled to add some new facts, 
as well as to correct, here and there, mis-statements or errors 
of interpretation, such as will creep in, even when the 
greatest care is taken to ensure accuracy. 
In the course of my work I have received very material 
assistance from Dr. Sclater, and also from my friend 
Mr. D. Seth-Smith ; both these gentlemen having furnished 
