No. 2.] 
bu. 
c.mus. 
com. 
ag. 
a.gr. 
ais. 
a-l.s.0. 
as. 
ep. 
fo. 
Lule 
gb. 
sf. 
ZW. 
2d. 
Zd.mus. 
mus. 
Wee 
Lae 
Vi 
ln? 
ln3A 
THE MORPHOLOGY OF DERO VAGA. 
175 
REFERENCE LETTERS. 
blood vessel. 
circular muscle layer. 
commissure. 
dorsal ganglion. 
dotted groove. 
dissepiment. 
dorso-lateral row of sense 
organs. 
dorsal setae. 
epidermis. 
fibrous part of ventral cord. 
ganglion cell. 
glandular band. 
giant fibres. 
intermediary nerve. 
lateral line. 
lateral line muscle. 
longitudinal muscle layer. 
lateral nerve. 
first lateral nerve from ven- 
tral ganglion. 
second lateral nerve from 
ventral ganglion. 
third lateral nerve from ven- 
tral ganglion. 
fourth lateral nerve from 
ventral ganglion. 
1.5.0. 
mM. 
72.0. 
ppc.mus. 
5.7. 
lateral row of sense organs. 
mouth. 
median row of sense organs. 
main sympathetic nerve. 
muscle. 
first nerve from dorsal gan- 
glion. 
second nerve from dorsal 
ganglion. 
third nerve from dorsal gan- 
glion. 
fourth nerve from dorsal gan- 
glion. 
nephridial opening. 
plasma part of circular mus- 
cles. 
pharynx. 
sense cell. 
sympathetic ganglion. 
sympathetic nerve. 
sense organ. 
setae sac. 
ventral cord. 
ventral ganglion. 
ventro-lateral row of sense 
organs. 
ventral setae. 
