^7 



STUDIES ON AVIAN H.EMOPEOTOZOA. 737 



line. (Unfortunately the terminal grannie has not come out in the 

 plate.) 



Fig. 18. — Yery young form. 



Figs. 19-2], 24-26, Lencooy tozoon fringillinariim, n. sp. 



Figs. 19 and 24. — Yoimg gametocytes, female and male. 

 Figs. 20 and 26. — Large female gametocytes. 

 Figs. 21 and 25. — Lai'ge male gametocytes. 

 Fig. 22.^ — Immature red blood-corpuscle. 

 Fig. 23 — Leucocyte (uninfected). 



PLATE 28. 

 Figs. 27-56. — T. fringillinarum. 



Figs. 27-33. — Ordinsry definitive forms of the parasite of varying 

 size ; 27 from a chaflBnch inoculated with redpoll culture. 28-31 from 

 naturally infected chaffinch, 32 and 33 fi-om naturally infected redpoll. 



Figs. 34-38. — Large, massive forms, from a redpoll. 



Fig. 39. — ? Transitional form, intermediate between ordinary type 

 and that last mentioned, from a redpoll. 



Figs. 40-45. — Series of fusiform parasites from very small to a 

 moderate size, from a chaffinch (Case B). 



Figs. 46-54. — Small forms from a chaffinch (Case A), fusiform or 

 broad and stumpy ; 48 and 54 show indications of division. Many of 

 the individuals in both these series show the granular chain or line. 



Figs. 55 and 56. — Remarkably slender individuals (? young, definitive 

 forms). 



Figs. 57 and 58. — Immature red blood-cell or ei'ythrol>last and unin- 

 fected leucocyte, respectively. 



Figs. 59-62. — Leucocytozoon fringillinarum. 



Fig. 59.— Male individual. 



Fig. 61.— Female individual. 



Figs. 60 and 62. — Young forms, probably female individuals. 



Figs. 63-70. — Halteridium fringillse. 



Figs. 63, 65, and QQ. — Medium-sized to large female forms. 

 Fig;. 64. — " Indifferent '' individual. 

 Figs. 67-69. — Small or intermediate-sized individuals. 

 Fig. 70 a and h. — Male gametes. 



PLATE 29. 

 Figs. 71-111. — Cultural forms of T. fringillinarum. 

 [All the figures are from original cultures of 6-8 days, except figs. 



