• Coelmic cavity is filled with botryoidal tissues.

• Body wall is composed of thin cuticle, epidermis dermis, thin circular muscle layer, thick longitudinal muscle layer, dorso – ventral oblique and ventral muscles and botryoidal tissues.

• Crop is composed of cuticle, longitudinal and circular muscles and thin internal epithelial lining of prismatic nucleated cells.

• Epithelial lining is thrown into short folds.

• Dorsal, ventral and lateral haemocoelic channels along with their vessels and ventral nerve cord in ventral vessel are present.

• Cavity of the crop and its diverticula is continuous giving 3 chambered appearance, segmental organs or nephridia are also seen.

• Crop or its diverticula are capable of great dialation to store large quantity of blood.