Vi CONTENTS. 



Page 



NUMBER LXXI. 



XXVIII. On the " Nucleus " of the Characeas. By Al. Braun ... 297 



XXIX. On the Branchial Currents in the Bivalves. By William 

 Clark, Esq 303 



XXX. On Preserving the Balance between the Animal and Vege- 

 table Organisms in Sea Water. By Robert Warington 319 



XXXI. On the Cornbrash of the neighbourhood of Cirencester. 

 By James Buckman, F.L.S., F.G.S., Professor of Geology Royal 

 Agricultural College 324 



XXXII. On the Teeth of the Pneumonobranchiate Mollusca. By 



J. E. Gray, Ph.D., F.R.S., V.P.Z.S. &c 329 



XXXIII. On the Mechanism of Aquatic Respiration and on the 

 Structure of the Organs of Breathing in Invertebrate Animals. By 

 Thomas Williams, M.D. Lond. (With a Plate.) 333 



Proceedings of the Zoological Society 348 



Spadix purpurea, by W. P. Cocks ; Note on the Parasitism of Coman- 

 dra umbellata, by Asa Gray ; Rare Irish Mollusca, by William 

 White Walpole ; Natica sordida, by William White Walpole ; 

 Meteorological Observations and Table 365 — 368 



NUMBER LXXII. 



XXXIV. On the British Tritons. By John Higginbottom, 

 F.R.S. (With two Plates.) 369 



XXXV. Notes on some new or little-known Marine Animals. 

 (No. 3.) By P. H. GossE, A.L.S 384 



XXXVI. Descriptions of some undescribed species of Reptiles col- 

 lected by Dr. Joseph Hooker in the Khassia Mountains, East 

 Bengal, and Sikkim Himalaya. By J. E. Gray, Ph.D., F.R.S., 

 V.P.Z.S., P.B.S. &c 386 



XXXVII. On the Mechanism of Aquatic Respiration and on the 

 Stmctm-e of the Organs of Breathing in Invertebrate Animals. By 

 Thomas Williams, M.D. Lond. (With a Plate.) 393 



XXXVIII. On Blood Rain {Palmella prodigiosa, Mont.). By 

 H. O. Stephens, Esq., Vice-President of the Bristol Microscopical 

 Society. (With a Plate.) 409 



XXXIX. Descriptions of two new genera {Pfeifferia and Janella) of 

 Land Mollusca. By J. E. Gray, Ph.D., F.R.S., V.P.Z.S 412 



XL. Notes on the Habits of Bivalve Shell-fish. By S. P. Wood- 



XTARD 415 



