70 
Proceedings of Poyal Society of Edinburgh 
SESS. 
Balanoglossus. 
Phoronis. 
Cephalodiscus. 
Rhabdopleura. 
Divisions of 
Proboscis. 
Epistome. 
Buccal shield. 
Epistome. 
Body. 
Collar 2. 
Collar (fused). 
Collar 2. 
Collar 2. 
Trunk 2. 
Trunk 2. 
Trunk 2. 
Trunk 2. 
Shape of 
Elongated and 
Reduplicated but 
Reduplicated. 
Reduplicated. 
Body. 
not redupli- 
cated. 
elongated. 
Shape of 
Cylindrical. 
Two arms bear- 
Twelve arms bear- 
Two arm s bearin g 
Collar. 
ing tentacles in 
ing tentacles in 
tentacles in two 
two rows. 
two rows. 
rows. 
An operculum. 
Lophophoral 
Post-oral lamella 
Post-oral lamella. 
lamella . 
Shape of 
Large and cylin- 
Small and lamel- 
Large and cuspi- 
Small and cuspi- 
Pi'03-oral 
Lobe. 
drical. 
lar. 
date. 
date. 
Apertures. 
One or two pro- 
No proboscis 
Two buccal pores. 
No proboscis 
boscis pores. 
pores. 
pores. 
Two collar pores. 
Two collar poi’es. 
Two collar pores. 
Two collar pores. 
Genital ducts. 
Two genital 
Two genital ducts. 
? 
1 
nephridia. 
Ectoderm. 
Unicellular epi- 
Unicellular epi- 
Unicellular epi- 
Unicellular epi- 
dermis. 
dermis. 
dermis. 
dermis. 
Ciliated and 
Ciliated (partly) 
Ciliated (partly) 
Ciliated (partly) 
mucous cells. 
and mucous 
and mucous 
and mucous 
cells. 
cells. 
Cells. 
A tubular skeletal 
A tubular skeletal 
A branching 
A tubular branch- 
structure. (In 
structure. (In 
skeletal struc- 
ing skeletal 
some.) 
most.) 
ture. 
structure. 
Nervous 
At base of ecto- 
At base of ecto- 
At base of ecto- 
As in Cephalodis- 
System. 
derm. 
derm. 
derm. 
cus. 
Coned, in collar 
Coned, in Collar 
Coned, at collar 
(ring), base of 
(ring), base of 
(ring), base of 
epistome, dorsal 
epistome, dorsal 
epistome. 
and ventral 
coi'ds. 
cords. 
No ciliated sense 
Paired ciliated 
• 0* 
Paired Ciliated 
organs. 
sense organs at 
sense organs at 
base of collar- 
base of collar- 
arms. 
arms. 
Pigment. 
Pigment ecto- 
Pigment ecto- 
Pigment ecto- 
? 
dermal. 
dermal. 
dermal. 
Many colours. 
Many colours. 
Many colours. 
Mesoderm. 
Ccelomic cavities 
Ccelomic cavities 
Ccelomic cavities 
Body 
tend to fill up 
tend to till 
tend to till 
Cavities. 
with connective 
with connective 
with connective 
( See Divisions 
tissue. 
tissue. 
tissue. 
of Body.) 
Trunk has genital 
Trunk has genital 
Trunk has genital 
organs. 
organs. 
organs. 
Dorsal (incom- 
Dorsal (incom- 
Dorsaland ventral 
plete in some) 
plete) and ven- 
me enteries in 
and ventral 
tral mesenteries 
trunk. 
mesenteries in 
collar and 
trunk. 
in trunk. 
Vascular vessels 
Vascular vessels 
None. 
None. 
dorsal, ventral, 
dorsal, ventral, 
and lateral in 
and lateral in 
collar. 
collar, produced 
into tentacles. 
Longitudinal and 
Longitudinal and 
Longitudinal and 
None. 
circular muscles 
circular muscles 
circular muscles 
in trunk in- 
in trunk in- 
only in stolon. 
sertedinchond- 
serted in chon- 
roid tissue. 
droid tissue. 
Collar cavities in 
Collar cavities 
Collar cavities 
Collar cavities 
operculum. 
produced Into 
produced into 
produced into 
tentacles and 
tentacles and 
tentacles and 
lamella. 
lamella. 
lamella (?). 
