Vlll CONTENTS. 



Page 

 Thalamiflorae. — The Grasses of Great Britain : illustrated by 

 J. E. Sowerby; described by C. Johnson. — The Insect Hunters; 

 or, Entomology in Verse 516 — 518 



- Proceedings of the Zoological Society 51 9 — 524 



On the British Edriophthalma,by C. Speuce Bate, Esq. ; On Circulation 

 in Plants, by A. Trecul; On Sepia officinalis, by Mr. R. Damon; 

 On the Sphcerobolus stellatus, by the Rev. H. H. Higgins, M. A. ; 

 On the Grape Disease, by Mr. J. W. Slater ; On the Cause of the 

 Rhythmic Motion of the Heart, by J. Paget, Esq., F.R.S....524— 530 



Index 531 



PLATES IN VOL. XX. 



Plate I. Structure of Spongilla. 



yjY* >■ Hectocotylus-formation in Argonauta and Tremoctopus. 



IV. New Species of Echinodermata. 



Yj* [-Foraminifera from the Feejee Islands. 



VII. Diatomacese and Desmidieae from the Feejee Islands. 

 VIII. Anatomy of Hydatina senta. 

 IX. New species of Palaeozoic Star-fishes. 



-yj* tNew species of British Entomostraca. 

 XII. New species of Cryptogams. 



