— a. eee 
Vou. 2] Robertson.—Non-Incrusting Bryozoa. 
ABBREVIATIONS IN THE PLATES. 
a.—area. 
ab. ap.—aborted aperture. 
ad.—adnate part of zocecium. 
ap.—aperture. 
b. sp.—basal spine. 
b. f.—binding fibre. 
bi.—bifureation. 
bi. av.—avicularium at bifurcating 
zocecium. 
bi. sc.—hbifid seutum. 
bi. sp.—hifid spine. 
bk.—beak. 
br.—branch. 
c. av.—eurved avicularium. 
cr. Sp.—erossed spine. 
¢. Sp.—eurved spine. 
car. val. 
con. tu.—connecting tube. 
cr. bor.—erenulate border. 
cr. br.—creeping branch. 
cardiac valve. 
d.—denticle. 
dis. ze.—distal zoccium. 
e. br.—erect branch._ 
€. Sp.—erect spine. 
fr. av.—frontal avicularium. 
fr. ze.-—frontal zocecium. 
fst. ze.—first zocecium. 
giz.— gizzard. 
gv.— groove. 
i.—intestine. 
in. sp.—inner spine. 
int.—internode. 
j.—Joint. 
k.—knob. 
lat. av.—lateral avicularium. 
lat. z@.—lateral zocecium. 
m.—mouth. 
man.—mandible. 
me. av.—median avicularium. 
mem. ap._—membranous aperture. 
mus.—muscle. 
o.—ovum. 
oe.—ocecium. 
oe. or.—oeecial orifice. 
@s.—cesophagus. 
op.—operculum. 
or.—orifice. 
ou. Sp.—outer spine. 
ov.—ovary. 
p-——pore. 
par. mus.—parieto-vaginal muscle. 
pd.—polypide. 
ped. av.—peduneulate avicularium. 
ph.—pharynx. 
pr. by.—primary branch. 
py. val.—pyloric valve. 
r.—yrootlet. 
rb.—trib. 
r. ch.—root chamber. 
r. {b.— root fibre. 
re. mus.——retractor muscle. 
re. sh. mus.—vetractile sheath muscle. 
re. pd.—regenerated polypide. 
s. h.snake’s head. 
se.—seutum. 
sec. br.—secondary branch. 
seg.—segment. 
sep.—septum. 
sh. mus.—sheath muscle. 
sm. av.—small lateral avicularium. 
sp.—spine. 
st.—stalk. 
ter. br.—tertiary branch. 
tr.transition from segment of stalk 
to zocecium. 
tu.—tubular part of the zocecium. 
u. r.—upward extending rootlet. 
v.—vibraculum. 
v. c.—vibracular cell. 
v. ch.—vibracular chamber. 
2e.—zocecium. 
z2@. bi.—zoecium at bifureation. 
ze. br.—zoecial branch. 
zZ@. or.—zocecial orifice. 
