092 i>l«. II. H. iANTIIAM OX THE [Miiy^-), 



2. Olsorvations on the Tiirnsilic Protozoa of tlio Uid 

 Grouse {L(i(/ojii,x .scotinu^), with a Note on the Grouse 

 Fly. By H. B. Fantham, D.Sc. Lond., B.A. Gantal)., 

 A.R.C.S., F.Z.S., Christ's College, Cambridge, Assistant 

 to- the Quick Professor of Biology, Cambridge, and 

 Protozoologist to the Grouse Disease Inquiry. 



[Received April 5, lUlCl.] 



(Plates LIX.-LXI.*) 



Contexts. 



Piiarc 



Introduction 092 



A. Parasites I'nuiid in tlic Hlood of (irousc 693 



((() Siioro/.oa — ll;unu)si)()ridia 693 



1. l,niicoci/fo3o<>ii loriiti 693 



(a) hitrodnctory 693 



(b) Tlie Heliitioii of the Parasite to its Host Cell .. 693 



((•) Morpliolo^y <;f the Parasite 691. 



(«') Schizo.n-otiy i'.9i; 



(<■) Cinicl'.idiiifr lieuiarks 696 



'J. Hwrnoprnteus mansoni 697 



(h) Spirocha'tacea (ProHaaellata) 697 



Si,ir(ii-/iie/ii !ti(/i)jii>i/i.i. s]). n (V.i" 



]i. Parasites I'diukI in the Alimentary Tract of Grouse 699 



(a) Pla-rellata 699 



Tri-r/ioiHo/tas ehertlii 699 



{!>) Spiroclia-tacea (Prortap'lhita) 7ol 



iipiroclifcta l<>vati,>i\i. w. 7i»l 



((•) Phi/.opoda 7ii-.; 



Amoeh<( {Kutamcrliii) Irif/ii/iniiis, sj). n. 7ni> 



(rf) .Sporoy.oa — Gregariiiida 7o.{ 



Monori/stis sp 7<)3 



Appendix— Note on the Grouse Fly, OrniZ/ioiiii/M lagopodis 704 



References to Literature 705 



Explanation of Plates 707 



IXTRODl'CTIOX. 



In the followiiiij p:ippr sire recorded f)hserv;)t.ion.s mnde on tlie 

 various paijisitif I'lotozoa found in (irouse exannncd iu eonnectioii 

 witli the Urouse I)i.se:ise Inquiry. Tlie ob.servation.s were, by 

 force of circumstances, limited to one season, and so the Jiccounts 

 of some of the parnsites are consequently incomplete. 'I'lic 

 para^sitic Protozobn of greatest econonuc importance, and to 

 ■which most attention had to be devoted, is Khneria (Coccidiiint) 

 avium, winch is the piithogenic agent of a fatal disease in grou.se- 

 chicks, jKirticularly ]»revalent in the spring and early summer. 

 Tlie morphology nnd life-hi.stoiy of Kimpria avium, and the 

 results of experimental studies on avian coccidiosis are set 



* For cvplanatioii "I the I'lales .-ee ji, 7<i7. 



