466 HaroLD HEATH, 
are unusually ill-defined and stain but faintly. A large number of 
cells, at least 50, compose the expanded portion of each papilla and 
a broad stalk attaches it to the hypodermis. Some of these cells 
of the expanded part, possibly all of them, contain a very few, light 
yellowish-brown granules. 
The spines, forming several layers, are tangentially placed, but 
otherwise lie in every conceivable direction as they surround the 
papillae. While they differ considerably in size (0,04—0,16 mm) all 
acree in being hollow, somewhat curved with one end pointed and 
the other rounded. 
The outlet of the anterior pedal gland (Pl.24, Fig. 1, pg), separated 
from the atrial opening by a clearly defined spiculose tract, is 
unusually wide in transverse diameter, and the surface is further 
inereased by the development of one great longitudinal fold on each 
side. In the opposite direction the diameter of the crypt is rela- 
tivly short, and while the anterior wall is plain the posterior is 
produced into a few folds, three of which become continuous with 
the foot and a smaller fold on each side (Pl.24, Fig. 9). It is possible 
that the depth of the outlet may vary considerably, the pressure of 
the somatic muscles on the blood contained in the visceral cavity 
produeing a more or less complete eversion of the walls, while a 
pair of retractor muscles, inserted in the roof of the outlet and 
attached dorso-laterally to the body wall, doubtless produce an 
opposite effect. 
The anterior pedal gland, whose cells contain an inky black 
secretion when treated with DELAFIELD’s haematoxylin, is a volu- 
minous organ occupying a considerable portion of the visceral cavity 
between the front end of the brain and the level of the anterior 
end of the foot. Posteriorly its cells become reduced in size or the 
lobules contain fewer cells, and in this condition they merge insen- 
sibly into those of the posterior pedal gland. Anteriorly this last 
named organ is of more than average size, and the secretion es- 
capes not only through the walls of the foot but through those of 
the two lateral folds (Pl. 24, Fig. 9). This state of affairs continues 
to the cloacal chamber where the foot enlarges slightly, and together 
with the lateral folds extends some distance on the large papilla 
bearing the external reproductive opening. 
In several important respects the alimentary canal and: its 
appendages bears a striking resemblance.to what,occurs in the genus 
Alexandromenia; Ihe: atrial opening, sub-terminal in position, leads 
