POLYMASTIGINA 67 



group of basal granules, with which they are connected. Intestinal 

 parasites of vertebrates. 



Giardia { = Lambliay Fig. 51). (Diplomonadina.) Shaped like a half- 



nu 



Fig. 51. 



Fig. 52. 



Fig. 51. Giardia intestinalis, from the intestine of man. Semidiagrammatic. 

 axs. axostyle (axoneme) ; ba.gr. basal granules ; ce. centriole ; cone, ventral con- 

 cavity (" sucker "); yz. fibre around concdivity ; fl., fl.' , fl.'\ fl.'" anterolateral, 

 posterolateral, ventral, and caudal flagella; kar. karyosome; la.sd. lateral 

 shield, the thickest part of the body; nu. nucleus; p.by. parabasal body; 

 rh. rhizoplasts. 



Fig. 52. A diagram of the structure of Trichonympha campanula, showing a 

 portion of each layer. From Hegner and Taliaferro, after Kofoid and Swezy. 

 alv.l. alveolar layer; ant.fl. anterior flagella; ba.gr. rows of basal granules; 

 ce. point at which the spindle arises in division; chr. chromatin granules in 

 nucleus; ecp. ectoplasm; enp. endoplasm; f.b. food bodies; lat.fl. lateral 

 flagella; long.my. longitudinal myonemes; nu. nucleus; obl.f. oblique fibres 

 (rhizoplasts) ; /)e/. pellicle ; /)05f.yZ. posterior flagella; ^wr/.rd'^. surface ridges of 

 pellicle; tr.niy. transverse myonemes. 



pear, broad end forwards, with, on flat side, a concavity for adhesion. 

 Organization as Hexamitus but all flagella in middle or hinder region. 

 Parasitic in intestine of man and other mammals. 



Trichonympha (Fig. 52). (Hypermastigina.) Body narrower in 



