38 Nils Hj. Odhner. 
The cirrose area is surrounded by ridges as usual (fig. 53); 
the pharynx following it has its walls furnished with many 
longitudinal folds, which terminate in a thick circular sphincter 
just in front of the radula, the thickest portion of it lying dor- 
sally. Behind this circular fold the pharyngeal cavity widens 
again and, on its ventral side, contains the radular sheath. The 
radular support is attached to the body wall by means of numer- 
ous muscular cords. The radula (fig. 57) is depressed along its 
median line, thus forming a furrow, and in this character resemb- 
ling the distichous type.) No subradular organ was observed. 
Å short oesophagus emerges on the dorsal side of the 
pharynx opening into the intestine, and limited from it by a 
strong sphincter. On the latter there projects a thin circular fold 
in the same manner as is described by HEATH, who considers its 
function as that of a valve (l.c. p. 100). A pair of very long ven- 
tral salivary glands open separately into the oesophagus just above 
the radula sac, and a dorsal salivary gland on its opposite side. 
The ventral glands constitute a pair of long tubes with circular 
section and very wide central lumina, lined with high granular 
erythrophilous cells. They extend immediately beneath the intes- 
tine, above the horizontal septum of the ventral sinus. 
The intestine is furnished with an antero-dorsal coecum 
protruding forward beyond the brain. Its lumen, as well as that 
of the whole intestine, is divided into diverticula by means of 
regular dissepiments. | 
Beneath the mouth there opens into the ciliated crypt a large 
anterior pedal gland, and above the pharynx the brain appears 
as usual, sending out some nerves towards the front. 
Within the pericardium the heart (fig. 54) is attached all 
along the dorsal side; it was distinctly divided into a ventricle 
and a thinner auricle behind this. 
Dorsally of the intestine the genital glands extend from head 
region to pericardium. They constitute a pair of simple tubes 
with a relatively broad lacunous septum between them, extended 
perpendicularly and without folds, or only with one rising from the 
one side or the other. The outer parts of the tubes were in 
some specimens filled with spermatids, in others empty, thus 
denoting that the male sexual products were already delivered. 
1) The number of teeth could not be exactly stated, as only some frag- 
ments of the radula of the one specimen were examined. 
