706 



ORDER: DIPLOMONADIDA 



G. pitymisi to a torm occurring in the field vole, Pitymis savii. Simon 

 (1922) has noted in Microtus fennsylvanicus acadicus in Nova Scotia a 

 Giardia which appears to be identical with the form described by Kofoid 

 and Christiansen as G. microti (Fig. 296,/). 



Hegner (1923a) has recorded as G. cavicB a form found by him in the 

 guinea-pig in America (Fig. 296, ^r). It is a small form like G. muris, but 



Fig. 296. — Diagrammatic Kepresentation of Various Species of Giardia, 

 SHOWING Specific Differences. (From Hegner and Taliaferro, 1924, 

 after Simon and Hegner.) 



a, 0. intestinalis of man; b, G. diioderuilis of rabbit; c, G. muris of rats and mice; d. G. agilis of 

 frog tadpoles; e, G. cants of the dog; /, G. microti of field mouse; g, G. cavice of guinea-pig. 



broader in proportion to its length, while the deeply staining bodies 

 behind the sucking disc are represented by two rods which lie trans- 

 versely and somewhat obliquely across the body. Another named 

 species is G. sanguinis found by Gonder (19106) in blood-films made 

 from a falcon {Elanus coeruleus) which had been shot in the Transvaal. 

 Noller (19206) described as G. ardece a form seen by him in the intestine of 

 herons {Ardea cinerea and Ardetta minuta), while Kotlan (1922) discovered 

 similar forms in the shrike {Lanius collurio) and avocet {Recurvirostra 



