292 Proceedings of the Royal Physical Society. 
The following communications were read: 
1. ‘‘On two of Lindley and Hutton’s Type Specimens—(1) Rhacopteris dubia, 
L. and H. sp.; (2) Sphenopteris polyphylla, L. and H.” By RoBert 
KipsTon, Esq., F.G.S. 
2. ‘On a new Species of Bythotrephis from the Lower Carboniferous of 
Lancashire.” By Roserr Kipsron, Esq., F.G.S. 
3. Mr GoopcHILpD, on behalf of Mr EAGLE CLARKE, exhibited, with remarks, 
a Specimen of the Hoatzin. 
4, ‘On the Moulting of Birds of Prey.” By J. G. Goopcu11p, Esq., F.G.S., 
F.Z.S8. 
5. **On the Facts of Sex in Relation to Metabolism.” By J. ARTHUR 
THomson, Esq.; M.A., F.R.S.E.; and NorMAN WYLD, Esq. 
Mr Sprague and Mr Millar were re-elected auditors. 
