FLAGELLATE FAUNA OF CCECUM OF SQUIRREL. 295 



does not come so far forward as the others in its lashings. The 

 flagella arise from a blepharoplast situated on the anterior 

 surface of the nucleus. It is almost impossible to count the 

 flagella in the living cell, because of their peculiar movements. 

 A large number of favorable observations in the stained specimens 

 makes it fairly certain that the number is five. 



The nucleus is round, and possesses a tiny endobasal body 

 embedded in a mass of granules (Fig. 16). Sometimes only a 

 larger deeply staining endosome is seen (Fig. 18). About the 

 nucleus is sometimes seen a cloud of granules (Fig. 16). 



The axostyle passes from the anterior end to the posterior tip. 

 It stains lightly. A number of favorable observations show that 

 it originates in the basal granule. 



A cytostome is often indistinctly seen at the anterior end. 



Hexamitus pulcher sp. nov. This Hexamitus, found in eighteen 

 of the twenty ground squirrels, is characterized by the presence 

 in the living cell of a large number of slightly refringent spherules 

 which stain intra vitam green with Janus green at first, then later 

 are reduced to the red. These granules dissolve out for the most 

 part in Schaudinn's fixative, although the cytoplasm of the 

 stained cells is markedly granular (Figs. 20, 21). It was because 

 of the wealth of mitochondria and the beauty of the vital stain 

 with Janus green that the specific name pulcher was given. The 

 body is irregularly oval, bilaterally symmetrical, and somewhat 

 plastic. The size does not vary much from eight to ten micra in 

 length by six or seven micra in width. 



The flagella are eight in number, the anterior pair projecting 

 almost at right angles to the body and vibrating actively in the 

 living cell. Two other pairs are inclined to wrap themselves 

 about the body giving it the deceptive appearance of possessing 

 several undulating membranes. The posterior pair leaves the 

 body at the posterior tip. Between them the posterior tips of the 

 axostyles protrude. 



Stained slides show the cell structures more plainly (Figs. 20, 

 21). In the anterior region on each side of the median line is an 

 elongated, deeply staining, nucleus. Between the nuclei lie a 

 pair of blepharoplasts from which the flagella arise, altho some- 

 times there seem to be two pairs. A pair of axostyles in the axis 



