OF THE ALIMENTARY TRACT 



185 



Fig. 28. — Giardia intestinalis. 



A and B, trophozoites as seen from lateral and anterior view. 

 C, D and E, cysts in different stages of development. Drawings of 

 specimens stained by iron-haematoxylon. x 2000. 



plasts. A ''parabasal" body occupies an oblique po- 

 sition in the cytoplasm posterior to the junction of 

 the shields. In the cyst the stage of development 

 determines the number and position of the nuclei 

 and the neuro-motor apparatus. The oral sucker 

 is not seen although some of the marginal fibers of 

 the two shields may show. The nuclei may be tw^o, 



