162 LIVERPOOL BIOLOGICAL SOCIETY. 
glands. These gland cells have very fine ducts and lead 
directly into the chief-duct,” that is to say into the pedal 
gland. Nalepa (7), Simroth (51), and Sarasin (49), are 
also of opinion that the pedal gland is composed of 
unicellular glands. But Sochaczewer (52) tells us, in the 
same paper in which he describes Semper’s organ, that in 
the pedal gland proper are present only glandular cells, 
whilst in the floor of it near the opening the so-called 
— “Filemming’s sensory cells’’ can be seen, placed between 
ciliated epithelium. He, Sochaczewer, thinks the pedal 
gland might be of olfactory function. 
Only a few weeks ago, I got a paper on the pedal gland 
by Dr. Székely (Bendegtz) (53). The paper is written in 
the Hungarian language, but as Dr. Székely was kind 
enough to send me at the same time an extract of it, 
written in German, I am able to summarize here his chief 
results. The opening of the pedal gland is elliptical in 
transverse section; further back the lumen has a fungus- 
like form, and the posterior part is of a flattened lanceolate 
form. The floor of the duct is raised into two longitudinal 
folds, which in the median line are separated by a 
slight depression. ‘T’hese two longitudinal folds and the 
depressed portion are covered by ciliated epithelium; the 
other portion of the duct, especially the roof of it, is 
covered by non-ciliated epithelium, more or less cylindrical 
in form. Glandular cells are numerous, but only on the 
ventral and lateral portions of the duct. At the base of 
the ciliated cells is found a rich network of very fine fibres. 
Székely thinks these fibres to be connective tissue, con- 
trary to the former investigations of Sochaczewer, who 
thinks them nerve-fibres. Therefore Székely comes to 
the conclusion that the pedal gland is no sense organ, but 
simply a secretory gland, furnishing the mucous necessary 
for creeping. 
