32 
whole of the gland is situated in a spacious lacuna, which is pres- 
ent in the connective tissue, just beneath the walls of the intes- 
tine. This lacuna has a separate membranous wall without 
any epithelium and is to a certain extent comparable to the longi- 
tudinal ventral and dorsal bloodsinus. Like these it is here and 
there (fig. 23, be) profusely filled with bloodeorpuscles and 
closely fitted round the eylindrical gland: posteriorly it is not con- 
tinued further backward than the end of this. In fig. 16 the re- 
lation of the salivary glands to the radular sac and to the opening 
into the oesophagus, which they have in common with the latter is 
diagrammatically represented. | 
The intestine which follows upon the pharynx is uniform in a 
very high degree. Its walls are extremely thin, consisting of a 
delicate membrane upon which a single layer of cells is applied. 
It is suspended to the muscular tunic of the body by fibrous tis- 
sue, irregularly spread over. the surface and sometimes uniting 
into more considerable bundles before the insertion in the body- 
wall 
This thin-walled portion of the intestine is provided with a cu- 
rious, coecum-like appendage in front. This coecum is situated 
medially, and passes over the muscular pharynx, beneath the 
dorsal bloodsinus and the paired anterior extremity of the herma- 
phroditic gland (c, fig. 12 and 36). It follows the bend of the 
integument at the blunt anterior termination of the body and 
terminates blindly in the vieinity of the cerebral ganglion. The 
walls of the coecum are ciliated in the medio-dorsal line. 
The deep transverse folds which are found along the whole length 
of the intestine were described by 'TULLBERG and v. GRAFF for Neomenia 
and are present in P’roneomenia as well. The prominent lamellae 
from the opposite sides do not approach each other so much as to 
nearly obstruct the direct passage backwards as v. GRAFF describes this 
for Neomenia, but still they are of considerable height (fig. 14 and 48). 
On the sides they appear as parallel transverse -plates; in the me- 
dian ventral line there are often mushroom-shaped folds partly cov- 
ering the base of the lateral folds.. In the median dorsal line the 
