1910.] PARASITIC I'ROTOZUA UF UIOD GROUSE. 697 



likely earner or second host of Leucoojtozooji lorati. Duriu"- iiiv 

 iuvestigations I have dissected several hundreds of grouse-Hies. 

 In the gut contents of a very few of these dies I found unicellular 

 motile verniicules, which may have been stages in the life-cycle 

 of L. lovatl or perhaps of Hceinoproteus mcinsonl. In the grouse- 

 tlies dissected I never found cysts, such as occur in the stomachs 

 of mosquitoes which have fed previously on blood infected with 

 malarial parasites. 



As before- mentioned (p. 693) Lev.cocytozo'6ii, lovati, as it has 

 been found to occur in gi'ouse on the moors, does not appear to be 

 a serious agent of disease. 



H.EMOPHOTErs iMAXsoxi Sambon, 1908. 

 (Plate LX. figs. 41-42.) 



This parasite of the red blood corpuscles of grouse was recorded 

 by 8ambon in 1908, though I am not aware tiiat he has vet 

 published a description or figures * of the parasite. 



In blood-films sent to me from Scotland and taken from two 

 grouse, I found, after staining, a few parasites inside the red 

 blood corpuscles. Two examples of the organism are drawn in 

 PI. LX. figs. 41, 42. They appear to be young forms of the 

 parasite, one of which showed clearly granules of melanin pigment, 

 I regret that, owing to lack of material, I cannot give a fuller 

 description of the organism. 



It is likely that this hfemosporidian is spread from grouse to 

 grouse by the grouse-fly, Orniihomj/ia lagopodis, in the gut of 

 which grouse-blood is found. In the gut-contents of the fly 

 unicellular vermicules, apparently protozoal organisms, were some- 

 times seen. Further, Sambon states that " in the stomach of one 

 [grouse-] fly, I discovered a few hajuiozoin-bearing protozoa, which 

 were no doubt the ookinetes of the Hcemoproteu.s mausoni pre- 

 viously found in the blood of a grouse from Scotland " (Sambon 

 (1909), p. 37). , 



Spiroclisetacea (Proflag-ellata). 



SriliOClJ^KTA LAGOPODIS^ sp. n. 



(Plate LX. figs. 29-40.) 



When exan\ining the blood of grouse for pai'asites, I have 

 occasionally found a few small Spirochietes exhibiting cousidei'able 

 moi'phological variation (PI. LX. figs. 29-40). As a, Spirocha?te 

 has not been previously recorded from the blood of grouse, I have 

 named it Spirochceta lagopodis. The Spii"ocha;tes were present in 



* Since writing the above I find that figures of Scemoproteus maimoni — which 

 I am informed are from originals supplied hy Dr. Samhon — have been piihlished. 

 recentlv in Castellani and Chalmers' '• Manual of Tropical Medicine." tis;-. 55, 

 p. 235.' 



