Lower lip _ 
a 
; “ppaeoral nerves 
‘Brain 
Orifice of Introvert 
Nephridia 
yk ‘ 
Spindle __---> B1Ves. 
P_. Pigmented skin of — 
pracorallobe 
= 
bes 
a 
Se 
. skeleton a 
5 
& 
& 
-- Eye spor 
- Brain 
Dorsal 
| muscle - 
_- Blood sinus 
' 
Ventral _ = } 4 
muscle z \ | Jk) ‘ be 
5 Fao aao------- j - intestine ya ‘ A ; Collar 
Skeleton 
Generative __ 
ridge ~ 
. Retractor mused 
Ventral __ 
+ Nerve Cord 
Celom Oesophagus Dorsal blood ' 
vessel 
