192 
treasurer : 
JAMES a. LYNDE, F.GLS., F.R.M.S., M.Inst.C.E. 
©f tf;c €DoundI : 
W. C. WILLIAMSON, F.R.A.S. 
JOHN WATSON. 
ALFRED BROTHERS, F.R.A.S. 
SAMUEL COTTAM. 
CHARLES BAILEY. 
THOMAS NEVILL. 
E. W. BINNEY, F.R.S., F.GkS, 
THOMAS COWARD. 
The Rev. J. E. Vize read a paper “On Testacella.” 
He described the general appearance of this slug, and 
gave an account of its habits as he had observed them in 
the neighbourhood of Trowbridge, where it is common. 
He also exhibited several mounted tongues of Testacella, 
and pointed out the peculiar characters of the teeth. 
July 18th, 1867. 
J. B. Dancer, F.R.A.S., President of the Section, in the 
Chair. 
“ Some Further Observations on the Cause of Rotation in 
the Cells of Yallisneria/’ by James G. Lynde, F.G.S., 
F.R.M.S. 
In a paper read by me at a meeting of the Section on the 
16th February, 1863, “ On the Action of Magenta Dye upon 
Vegetable Tissue,” I described a series of experiments upon 
cuttings of Vallisneria, made chiefly with a view to ascer- 
tain, if possible, the cause of the rotation of the chlorophyl 
vescicles within the cells. 
I then concluded that the rotation was due to the action 
of cilia on the inner surface of the cell wall, and was con- 
