1. Gastro-vascular Cavity In Metridium
The gastrovascular cavity is the primary organ of digestion and circulation
Single opening to outside is both
anus and mouth
Waste and undigested materials
GVS itself divided into no of
chamber by mesenteries radiating
from body wall.
2.
3. Two types complete and incomplete or
primary mesentery extend in body wall to
wall of pharynx.
6 pairs of primary and 2 pairs of
complete mesentery on side of
siphonoglyphs are called directed pairs.
The space between mesentery is called
intersepatal or inter- mesenteric
chambers.