68 
B,ie, sl, be, t, £, Im,scm.and I, as mn fig, 22, 
F and: vs, as in fig. 12, 
f.30: foot-gland. 
ll. lateral lacunae filled with bloodeorpuscles similarly to the 
central cavity of the foot. 
N,N’. longitudinal pedal nerve-stems, connected by 
c. transverse commissure partly situated inside the ventral sinus. 
d. horizontal museular septum (diaphragm). 
Fig. 25. A lobe of the foot-gland. 
Fig. 26. A single cell out of the same. 
Fig, 27. Bloodcorpuscles, two of them viewed sideways, one viewed from above. 
n. the nucleus. 
s. the spindle-shaped central axis. 
Fig, 23. The anterior foot-gland in horizontal section. 
P. pharyngeal cavity. 
I. integument. 
M. muscular tunie of the body. 
tm. radial muscles for the suspension of the pharynx. 
G. the anterior foot-gland. 
fg..the posterior longitudinal portion of the footgland. 
ce. eiliated canals, radiating into the anterior foot-gland. 
s. slit-]ike opening to the exterior. 
vs and F as in fig. 12. 
PLATE HI. 
Fie.29. A horizontal section (slanting backwards and upwards) through the 
anterior extremity, just above the mouth and below the lipfold 
(figs. 12, 15 and 17). 
S. the integument. 
m. the layer of muscles, radial and other, suspending the buc- 
cal mass. 
p- the columnar, hollow protuberances of the pharyngeal epi- 
thelium. 
bb’. the eiliated portions of the pharyngeal epithelium (cf. fig. 17). 
Fig. 30. A tangential section through a portion of the integument, after de- 
caleification. 
i. interspicular substance. 
sp. cavities in which spieulae of corresponding shape were situated, 
p- radial eylindrieal cavities through which the cellular strings 
supporting each spieule (ef. fies. 8 & 23) take their course. 
