CONTENTS. Vll 



Page 

 tany and Vegetable Physiology at the Bristol Medical School. (With 



two Plates.) 161 



XVII. Researches having for their object the Elucidation of certain 

 Phaenomena in the Physiology of the Araneidea. By John Blackwall, 



F.L.S 173 



XVIir. On some Points in the Structure and Growth of Monoco- 

 tyledons. By Arthur Henfrey, F.L.S. &c. (With two Plates.) ... 180 



XIX. Some Observations on Caladium distillatorium. By Mr. 

 Francis Williamson 188 



XX. Additions to the British species of Nudibranchiate Mollusca. 



By Joshua Alder and Albany Hancock 189 



XXI. Note on the Occurrence of the Bonapartian Gull {Larus Bo- 

 napartii, Rich, and Swains.) for the first time in Europe. By William 

 Thompson, Esq., Pres. Nat. Hist, and Phil. Society of Belfast 192 



XXII. On the Insects of Jamaica. By Philip Henry Gosse, Esq. 197 



XXIII. On the Fentriculidce of the Chalk ; their Classification. By 



J. TouLMiN Smith, Esq 203 



Proceedings of the Zoological Society ; Entomological Society ; Lin- 



naean Society ; Botanical Society of Edinburgh 221 — 239 



British Mollusca ; Have Ants when deprived of their Queen the power 

 of selecting one of their number and converting her into a fertile 

 female?; On the Digestive Apparatus of the Gnat, Culex pipiens, 

 Linn,, by F. Pouchet; Description and Anatomy of a new and 

 curious subgenus of Planaria, by Joseph Leidy, M.D. ; Basilo- 

 saurus ; Additional Note on a Paper on Porcupines, by J. E. Gray, 

 Esq., F.R.S. &c. ; Meteorological Observations and Table... 239 — 248 



NUMBER IV. 



XXIV. Descriptions of .^^jAzWes. By Francis Walker, F.L.S. ... 249 



XXV. On i\i&0\w\eoi Euphrasia officinalis. By G. Dickie, M.D., 

 ^ecturer on Botany in the University and King's College of Aberdeen. 260 



XXVI. On the Insects of Jamaica. By Philip Henry Gosse, Esq. 268 



XXVII. On the Habits and Geographical Distribution oi BuUmus, 

 genus of Air-breathing Mollusks. By Lovell Reeve, F.L.S 270 



XXVTII. Reports on the Progress of Physiological Botany. No. 3. 

 On the Growth of Leaves. By Arthur Henfrey, F.L.S. &c 274 



XXIX. On the VentricuUda; of the Chalk; their Classification. By 



, TouLMiN Smith, Esq. (With four Plates.) 279 



XXX. Notes, &c. on the genera of Insects Pissodes, Hypera, &c. ; 



nth descriptions of several new species. By John Walton, F.L.S. ... 295 



XXXI. Notes on the Species, Structure, and Animality of the 



