164 LIVERPOOL BIOLOGICAL SOCIETY. 
found were very conspicuous by their secretion, which was 
stained bright pink by the picro-carmine. 
The chief point, however, in which I differ from Székely 
is, that in many sections I found elongated and pointed 
cells, apparently of a sensory nature, placed either on the 
two lateral folds of the fungus-like outgrowth, or in a few 
cases also on the floor of the pedal gland laterally at the 
bases of the folds. Such cells had been found previously 
by Sochaczewer; but Székely, in criticising Sochaczewer’s 
paper, supposes that these cells were accidental products, 
formed by cut-off pieces of the ordinary ciliated cells. 
I find these elongated and pointed cells so numerous, 
however, that I cannot accept Székely’s explanation, 
especially as such cells are seen in no other part of the 
body, where pieces of columnar cells are cut off in various 
directions. 
My opinion, that these cells are sensory cells, is 
strengthened by the fact that I have found numerous 
ganglion cells placed either below the epithelium on the 
lateral sides of the pedal gland, or below the longitudinal 
folds in the region of the elongated pointed cells. But I 
have never found ganglion cells beneath the median 
depression of the fold, where the ‘‘sensory cells” are 
wanting. I have often seen nerve-fibres going out from 
the ganglion cells, but I have not been able yet to trace a 
connection between the ganglion cells and the “‘ sensory 
cells;’’ however, such a connection in all probability exists. 
The ganglion cells are enclosed by capsules of connective 
tissue, and the fibres of the connective tissue present very 
often an appearance of nerve fibres going from the ganglion 
cells to the epithelial cells, and these are probably the 
fibres which Sochaczewer took to be nerve fibres. 
I am unable at present to give more information in 
regard to this enigmatical organ, the pedal gland; but I 
