CONTENTS. Vll 
Page 
tany and Vegetable Physiology at tlie 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 
XVIII. 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 FIancock 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 VentriculidcB 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 By Francis Walker, F.L.S. ... 249 
XXV. On the Ovule of Euphrasia officinalis. By G. Dickie, M.D., 
Lecturer 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 Bulimus, 
a genus of Air-breathing Mollusks. By Lovell Reeve, F.L.S 270 
XXVIII. 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 VentricuUdcc of the Chalk; their Classification. By 
J. Toulmin Smith, Esq. (With four Plates.) 279 
XXX. Notes, &c. on the genera of Insects Pissodes, Hypera, &c. ; 
with descriptions of several new species. By John Walton, F.L.S. ... 295 
XXXI. Notes on the Species, Structure, and Animality of the 
