— 12 — 



Sarcosporidia, quoted Vuillemin's paper. However, Ferret 

 not only added nothing to the observations of the latter 

 author, but did not even notice any regular arrangement of 

 the rods of the membrane into rows. 



Judging from the coincidence of some of my data and 

 those of V u i 1 1 e m i n, the membrane has the structure just 

 described in all Sarcosporidia generally, S. tenella and 

 S. bubalis being only the most convenient objects for its study. 



2. Sarcocystis woodliousi n. s. 



Occurs in the muscles of Gazella granti. 



This species is named by me in honour of M-r Woodhouse, 

 Assistant Game-Warden in British East Africa. M-r Woodhouse 

 was the first to turn my attention to the frequent occurence 

 of some kind of Sarcosporidia in Grant's gazelle. 



The length and thickness of the sacs of S. woodliousi va- 

 ried in the foUoAving limits: the length=250iJi — iVs mm; the 

 thickness=60 — 80^. 



The spores of this species, which are larger than those of 

 8. bubalis are arranged in groups forming more or less regu- 

 lar balls closely adjoining each other. Each of these balls 

 contains more than ten spores. Between the groups of spores, 

 on the periphery of the sac are seen strands of the interme- 

 diary substance which divide the sac into chambers (which 

 is not to be found in *S\ bubalis). 



The exterior membrane of S. ivoodhousi is mush thinner 

 than in the preceding species, on account of which the radial 

 striation is very slightly expressed on it. The interior mem- 

 brane produces the strands of intermediary substance mentio- 

 ned, which pass from it into the middle of the sac. 



Contrary to what is found in the preceding species, 1 

 found sacs of S. ivoodhousi not only inside the muscle cells, 

 but in the intermuscular connective tissue as well. It is quite 

 probable that the early escape of the parasite out of the 

 muscle cells is due to the latter being thinner in Grant's ga- 

 zelle, as compared with the muscle cells in Bubalis cookei. 



The intermuscular sacs of Sarcocystis are surrounded by 

 a thin connective-tissue capsule (fig. 8). On all the surface 

 of the latter are dispersed the nuclei of connective-tissue 

 cells. These nuclei are especially abundant at the ends 



