VIU CONTENTS. 



Page 

 LXVII, Descriptions of some new Species of Birds. By Arthur, 

 Marquis of Tweeddale, F.R.S 533 



LXVIII, Description of a new Species of Bulhnus horn. South 

 Africa. By Edgar A. Smith, F.Z.S. &c 538 



Remarks on the Yellow Ant ; On some Points in the Organization 

 of the Bryozoa, by M. L. Joliet ; On the Coloration of tho Opti- 

 cal Elements in Locusta viridissiina, by M. J. Chatin ; On a new 

 Marsupial from Australia, by Prof. R. Owen, F.R.S. &c. . .539 — 542 



Index 543 



PLATES IN VOL. XX. 



Plate I. Arctic and Antarctic Sponges. 



11. Carboniferous Polyzoa — Salenia varispina ? 



in. I 



, Arctic Crustacea 



1 



V 1 



■ \ New Hydroids from the White Se 



VII. Salenia profundi. 



VIII. Arctic Spiders. 



IX. Siliceous Skeletons of Sponges. 



X. Bellidia Huntii. 



XI. Hancockia eudactylota. 

 XIL 



I Pteroplax coniuta. 

 JLi.ll. 



■ J Fossil Hyalonema and otlier Sponges. 

 XVI. Rotalia spiculotesta. • 



