CONTENTS. V 



Page 



Size of Marine Mollusca in various Latitudes of the European Seas." 

 By J. GWYN JEFFREYS, Esq., F.R.S 197 



XXIII. On the Tribe Colletieee, with some Observations on the 

 Structure of the Seed in the Family of the Rhamnacece. By JOHN 

 MIERS, F.R.S., F.L.S. &c 200 



XXIV. On Additions to the Madeiran Coleoptera. By T. VERNON 

 WOLLASTON, M.A., F.L.S 217 



New Books .- A Guide to the Quadrupeds and Reptiles of Europe ; 

 with Descriptions of all the Species : compiled from the Latest 

 Writers, by Lord Clermont. A Manual of the Subkingdom 

 Protozoa, with a General Introduction to the Principles of Zoo- 

 logy, by Joseph Reay Greene, B. A., Professor of Natural History 

 in Queen's College, Cork. Letters from Alabama, chiefly relating 

 to Natural History, by Philip Henry Gosse, F.R.S 222225 



Proceedings of the Royal Society 225 



On the Hydra rubra of Mr. Lewes, by the Rev. W. Houghton, M.A., 

 F.L.S. j On the Genus Hyalonema, by Dr. J. E. Gray, F.R.S. &c. ; 

 On the Generative Organs of the Scarabaeideous Beetles, by 

 C. Roussel; Description of a new Species of Gull (Gavia rosei- 

 ventris] from the Falkland Islands, by J. Gould, F.R.S. &c. 228232 



NUMBER XXVIII. 



XXV. On the Mycetozoa. By Dr. A. DE BARY, Professor of Botany 



in Freiburg. (With a Plate.) .'. 233 



XXVI. Notes on Plectopylis, a group of Helicidce distinguished 

 by several internal plicate Epiphragms ; with the Characters of a new 

 Species. By W. H. BENSON, Esq 243 



XXVII. On the Discovery of the Snail-Leech (Glossiphonia mar- 

 ginata] in England. By the Rev. W. HOUGHTON, M.A., F.L.S. 

 (With a Plate.) 248 



XXVIII. Descriptions of new Sertulariadce from the Californian 

 Coast. By ANDREW MURRAY, F.R.S.E. (With two Plates.) 250 



XXIX. On Additions to the Madeiran Coleoptera. By T. VERNON 

 WOLLASTON, M.A., F.L.S 252 



XXX. On the Tribe Colletiece, with some Observations on the Struc- 

 ture of the Seed in the Family of the Rhamnacece. By JOHN MIERS, 

 F.R.S., F.L.S. &c 267 



XXXI. Descriptions of Desmidiacea? from Lower Bengal. By 



G. C. WALLICH, M.D., F.L.S. (With two Plates.) 273 



