66 
p. the pericardial cavity. 
s. sense organ (cf. fig. 11). 
R. rectum. 
A. anal cavity. 
G. opening into this cavity of the genital apparatus and its 
accessories. 
The hermaphrodite gland (dorsally situated) is not repre- 
sented in figs. 12 and 13 because it is divided by a median 
vertical septum. 
Fig. 14. A horizontal section through the anterior extremity of the body. 
B,P,r,c and ds as in fig. 12. 
I. integument. 
fr. radial muscular bundles suspending the pharynx. 
tf. transverse folds of the intestinal epithelium. The spaces be- 
tween the folds are mostly filled with blood. 
Fig.15. The cavity of the pharynx opened and seen from above in another 
specimen. 
I,o,t and r the same as in figs. 12 and 14. 
s. one of the salivary glands after removal of the intestinal folds. 
pf. minute longitudinal folds in the pharyngeal epithelium. 
b. hinder portion of the pharyngeal epithelium forming an an- 
nular constrietion, of which the superior half has been re- 
moved in the figure and which in this specimen is considera- 
bly distended by blood. 
Fig. 16. Schematic outline of the median radular pouch with the opening r 
into the pharyngeal cavity, which it has in common with the paired 
salivary glands s. 
Fig. 17. Transverse vertical section through the mouth and the inferior por- 
tion of the pharyngeal wall. 
OÖ. the mouth. 
I. the integument. 
t. as in fig. 12. 
N. nervebranch to this fold. 
t’. the non-ciliated accessory fold. 
b and b’. the two ciliated accessory foide. 
p. the columnar protuberances of the pharyngeal epithelium be- 
tween b and b’. 
Fig. 18. A few isolated extremities of radular teeth. 
Fig. 19. Superficial aspeet of a portion of the radula in a transverse section 
through the anterior body-region. 
