author(s)
Jatinderpal Singh

abstract
The structure of the egg shell of Haemonchus contortus, a gastrointestinal parasite of sheep and goat was studied with the help of histological and histochemical staining techniques. The egg shell of H. contortus is a transparent, three- layered structure. The three layers being, an indiscernible vitelline layer, a chitinous layer and an outer uterine layer. The outer uterine layer is lipo-proteinaceous in nature. The chitinous layer consists of carbohydrates, glycogen and acid mucopolysaccarides. The vitelline layer is intensely rich in lipids.