PARASITES OF PROTOZOA 1013 



cases number from one to four. Fusijormis hilli, although much smaller, 

 is similar in shape and contains one or two chromatic granules that 

 occupy the full width. The bacteria were also observed in transverse 

 fission, the occurrence of which, together with the structure, readily 

 distinguishes them from pellicular striations. 



Ecologically, Vusijormh hilli is closer to F. termitidis than to the 

 "pellicular striations" on species of true Devescovina. It is abundant 

 in the lumen of the intestine, as well as on the surface of Crucinympha 

 hilli, which is not true of the "striations." On the surface it is arranged 

 in a manner scarcely suggesting striations; it sometimes adheres by one 

 end, and it is inconstant in occurrence. Kirby (1938b) noted that of 100 

 Crucinympha, 78 had no adherent rods, or very few. 



Later in the same year that Fusijormis hilli was reported, Grasse 

 (1926a) described F. grandis and F. melolonthae on Polymastix melo- 

 lonthae (Fig. 208 A, B, C,); F. legeri on Polymastix legeri (Fig. 

 208D); and F. lophomonadis on Lophomonas striata (Fig. 208E). F. 

 grandis and F. legeri adhere by one extremity. This article, and the more 

 extended account by Grasse (1926b), first established the true nature 

 of the micro5rganisms that adhere by full length to Polymastix and 

 Lophomonas, which had been regarded as pellicular structures. 



The writer has observed Fusiforniis-Yike microorganisms on many 

 polymastigote flagellates of termites. They are present on all the twenty 

 species of Devescovina, so constantly that no individual lacks them (Fig. 

 208A; Fig. 209F-J). On all except D. elongata, the rods appear almost 

 identical with F. lophomonadis of Lophomonas striata, both in their 

 morphology and their morphological relationship to the host flagellate. 

 They are evenly spaced, generally occur over the whole body except 

 the papilla, and are usually situated closer together than Grasse (1926b, 

 PI. 15) indicated for F, lophomonadis. They always adhere firmly by the 

 full length, and are not subject to detachment in the ordinary course 

 of technical manipulations. On smears in which the cytosome of the 

 flagellate has been much disturbed, they may have been partly or com- 

 pletely detached, and can then be conveniently studied. Specimens sub- 

 jected to such treatment may sometimes be bent considerably, as was 

 noted by Grasse (1926b) in F. melolonthae. Surface microorganisms 

 were absent from many specimens of Devescovina lemniscata of Neo- 

 termes insularis that had been fed on filter paper soaked previously in 



