CONTENTS OF VOL. XIX, 



[THIRD SERIES.] 



NUMBER CIX. Pggg 



I. On the Organs of Circulation of the Roman Snail (Helix poma- 

 tia). By Charles Robertson, Demonstrator and Curator of the 

 Anatomical Collection, Oxford. (Plate I.) 1 



II. On Pauropus, a new Type of Centipede. By Sir John Lub- 

 bock, Bart., V.P. Linn. Soc, Pres. Ent. Soc, V.P. Ethn. Soc, 

 F.R.S., &c , 8 



III. On Rotation and Circulation in the Cells of Plants, with re- 

 ference to the question of Contractility. By Professor Reichert... 10 



IV. Proofs of the Animahty of the Ciliate Sponges, and of their 

 Affinities with the Infusoria fiagellata. By H. James-Clark, A.B., 

 B.S 13 



\. On. iheMenispermacecB. By John Miers, F.R.S., F.L.S., &c. 19 



VI. On the Perforate Structure of the Shell of Spirifer cuspidatus. 



By Wm. B. Carpenter, M.D., F.R.S 29 



VII. On the Correlation of the Lower Lias at Barrow-on-Soar, in 

 Leicestershire, with the same Strata in Warwickshire, Worcestershire, 

 and Gloucestershire ; and on the occurrence of the remains of Insects 

 at Barrow and in Yorkshire. By the Rev. P. B. Brodie, M.A., 

 F.G.S 31 



VIII. On the Fecundation of the Floridece. By E. Bobnet and 



G. Thuret 35 



IX. On the Ballast-Flora of the Coasts of Durham and Northum- 

 berland. By John Hogg, M.A., F.R.S., F.L.S., &c 38 



X. Further Observations on Venus's Flower-basket [Euplectella 

 speciosa). By Dr. J. E. Gray, F.R'.S., V.P.Z.S., &c 44 



XL On Argulus dactylopteri, a new Marine Argulid from the West 

 Indies. By T. Thorell 45 



XII. Description of a new Genus of Diurnal Lepidoptera belonging 



to the Family Satyridcc, By Arthur G. Butler, F.Z.S. (Plate II.) 49 



XIII. Observations on the Variation of Cyllo Leda of Linnaeus, 

 and on the different forms of that Insect in the National Collection. 



By Arthur G. Butler, F.Z.S 51 



A 



