28 Nils Hj. Odhner. 
these characters K. borealis resembles Simrothiella described above. 
A short distance behind this flexion the cuticula disappears in 
the lateral diverticles, and their lumen is filled with the large 
hyaline cells, which are described in many Solenogastres as car- 
tilagineous ones similar to those of the Gastropoda. 
In Kruppomenia borealis the said cartilagineous processes of 
the radular sheath are disconnected from it posteriorly, and are 
lodged laterally beneath the salivary glands (fig. 41), where they 
attenuate till they finally disappear. In this respect the structure 
is similar to that in Simrothiella, but in the latter form the phar- 
yngeal processes are open throughout and greatly prolonged 
rearwards. 
Ås already mentioned, the salivary glands (figs. 37, 41) are 
simple, not lobated as in Pruvotina. They are situated in the 
space between the intestine and the septum forming the roof of 
the ventral blood vessel. They consist of cylindrical cells with 
basal nuclei and a content of spherical corpuscles; the cells form 
numerous layers, except above the excentric lumen where only 
one layer exists. The wall of the lumen lacks a separate lining. 
The intestine has a dorsally directed anterior coecum lined 
with a rather low epithelium. Farther back, its walls grow con- 
siderably thicker, except the dorsal one, which retains its primary 
thickness throughout. They contain a multicellular layer of cy- 
lindric elements, the innermost ones as usual evidently serving as 
hepatic and pancreatic cells and containing a grained substance 
deeply dyed with haematoxylin. In the median line of the dorsal 
wall there runs a ridge-shaped thickening of the epithelium formed 
by elongated ciliated cells (fig. 42) thus being of different nature 
from those of the remaining intestine and without liver secretions. 
This longitudinal ridge corresponds to the double epidermis 
stripe bounding the furrow in other Solenogastres such as Alex- 
andromenia; it may perhaps indicate a rudiment of a typhlosolis. 
A similar fold is described by Pruvor 1891 in Nematomenia 
banyulensis and by HEATH in Dondersia californica (1911, p. 157, 
på 23) tig. 7): 
At the posterior end the intestine is suddenly constricted to 
form the rectum, which passes beneath the pericardium with a — 
slight ascent to the anus situated in the dorsal part of the cloacal 
cavity (figs. 35, 38). The rectum is lined with a low cubical 
epithelium; in its proximal part the typhlosolis is still present. 
