BILL AND HAIRS OF ORNITHORHYNCHUS PARADOXUS. 
143 
The Structure of the Bill and Hairs of Ornitho- 
rhynchus paradoxus; with a Discussion 
of the Homologies and Origin of Mammalian 
Hair. 
By 
Edward B. Poulton, M.A., F.R.S., «&c., 
Hope Professor of Zoology in the University of Oxford. 
(With Plates 14, 15, and 15a.) 
ContTENTS. 
I. IntrRopuctTion 
II. Tur PusH-Rops. : 
III. Tue GLanpD-DUCTS OF THE nek AND THE ren eennne ASSOCIATED 
WITH THEM . 3 
IV. Toe Harrs oF OLD aNnD Yours open ee 
1. Historical, by W. Blaxland Benham, D.Sc. (Lond.), Hon. 
M.A. (Oxon.), Aldrichian Demonstrator in ane 
Anatomy in the University of Oxford 
. General Structure and Arrangement of ine 
. Comparison between the Hairs of Old and Young 
Animal . 
4. Minute Structure Al meamation Gh air baa 
its Sheaths 
5. Mode of Succession ae sie, ais 
. Recapitulation of Essential Peculiarities of ‘Hair 
of Ornithorhynchus as compared with that of 
Higher Mammalia 
V. THe Homotocizs an» ORIGIN OF Teena) Hen 
1. Historical, by W. Blaxland Benham 
2. Conclusions derived from the Study of Onno: 
rhynchus 
vou. 36, PART 2.—NEW SER, L 
oo % 
7) 
