This model shows the anatomy of hydra in longitudinal section and shows

the important structures,including ectodem,mesoglea,male and female

egg-cells,buds and mouth opening.A supplementary model block cut from

the wall of body,enlarged about 250 times,is also provided specially to

show different types of cell,such as nematoblasts,musdilo-epithelial cells,

sense cells,interstitial cells,and nerve network.Another 2 block models

specially show enlarged cnidoblast cell which is able to capture and kill

its prey like daphnia.Total 4 parts.Made of high quality PVC.On a base.

Dim:58.5*14*35CM