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 519—524 



On the British Edriophthalma,byC.Spence Bate, Esq. ; On Circulation 

 in Plants, by A. Trt'cul; On Sepia officinalis, by Mr. R. Damon; 

 On the Sphcerobolus siellatus, 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 5M1 



PLATES IN VOL. XX. 



Plate I. Structure of Spongilla. 



jjj" > Hectocotylus-formation in Argonauta and Tremoctopus. 



TV. New Species of Echinodermata. 



--j' 1- Foraminifera from the Feejee Islands. 



VII. Diatomaceae and Desmidiea; from the Feejee Islands. 

 VIII. Anatomy of Hydatina senta. 

 IX. New species of Palaeozoic Star-fishes. 



.Jy" [• New species of British Entomostraca. 

 XII. New species of Cryptogams. 



