HLOOr-PAllASITKS. 417 



^^^iT- Haimtat. 



Wliydah Rird {Vidua paradixea) W. Africa, 



Maiifhuriaii Crane (Grns jajmnensis) N. Cliiiia. 



Lawes' 15iid of Paradise {Fnrotia lawosi) New Ouiiioa, 



Kagle-Owl {Ihiho maculosa) S, Africa. 



Indian Roller (C'oracJa* twrf/oa) India. 



Yollow-chceked Tit {Machlolnphus xanthogenys) ... do. 



2 IJIue Tanagers (Tanagra episcopus) ' S. AmeriM. 



Fraser's Eagle-Owl ( Bubo poensis) W. A frica. 



Cape Sparrow (/'assar arewa^Ms) S.Africa. 



2 I'uriile-capped Lories (Lofius damicella) Moluccas. 



Purple Sugar-Bird {C/ereha ri/anna) S. Ainorioa. 



One other parasite remains to he uientionefl— tlie Leuco- 

 cytozoon : tliis is found in the blood of bird^; in tlie form of a 

 h)ng, spindle-shaped, unpignitnted );ody, about tijree or four 

 tunes the length of a iioimal erythrocyte, and about one third 

 of the breadth. Unstained they aro colourless and are always 

 free from pigment. They are rare, and at present uncortiiin as 

 to position, and they occur only in the blood in the sexual forms. 

 The dull plasma staining may indicate that the forms in t})e blood 

 are macrogametes, The eailier observers of this j^arasite— 

 Danilewsky and Ziemann— believed that the host-cell wtm a 

 leucocyte, but I^averan lias «hown tliat it is an erythrocyte. 



There wouM seem to be mme. analogy between the curious 

 enlargement of the host-cell and the enlargement and delia-mo- 

 globinisation of the eiythrocytes of snakes, containing one of the 

 varieties of hjHmogregaiines mentioned before. 



I have found these pai-asiteK in two birds only, both of which 

 are new as hosts, 



LeUOOOYTOZOA FOUXD IX 'fHK BU'OL) DV Liiiwu. 



Name. HiBixAx. 



Scaup's Duok (Fuligula manila) Europe. 



I.evailliiiit's Franc/<lin (Ffannolinus lemillanti) ... Cape Colony, 



EXPLA^ATIOJf OF THE Pf^ATES. 



The luicrophotographs were m*de for iije by Dr. A. Norn,5,j, ar,d the drawingn 

 were made to scale by Mr. W. S. JJerridge. 

 The scale divisions are -Ol n^illiiijetre. 



Pl, XI^IX, 



Fig. I. Filaria in tlu? blood of 4 Wallaby. X 250. The eapsijle can be Kpon with 

 a lens as a white lijie outsi4e tlie filaria. 



The blood ill this i-ase was v.ery disorganised unA there was a marked 

 .eu<pocytosi.s. In the po)ich there was a very young foetus in the bod v- 

 cavity ot which there was onp adult fil^ri^ similar to others found in the 

 body-cavity ot the iQOther, No embryo tijariic were found in the blood 

 ot the jcetus. 



Fig. 2, JfiUriaj in the blood of a Giaijt Toad. X 300. The capsule \* quite visible, 

 ana also tlip pointed anterior end. 

 These were present in large numbers. 



Proc. Zool. 8oc.— 1912, Xo. XX VII. 27 



