Mollusca

Animals show following features-

• Body is bilaterally symmetrical ,triploblastic and with coelom .
• Body is soft and mostly enclosed in hard shell.
• Body is divided into head,foot and visceral mass.
• Muscular foot helps in locomotion.
• Digestion system is complete.
• Open circulation system is found.
• Respiration takes place through body surface or skin.
• Excretion takes place by metanephredia.
• Animals are hermaphrodite. 
• Example - Snail ,Unio,Octopus etc.

Octopus 

Snail

Unio