52 University of CalifoDiia Publications in Zoology [Vol. 20 



fig. 80). Exteziding out from each granule is a slender thread or 

 rhizoplast, the basal part of the flagellum. This passes up through 

 the ridge and leaves the crest as the single flagellum. The flagella 

 are placed closely together so that the rows of basal granules form 

 continuous lines extending from the anterior end of the organism 

 posteriorly (fig. B, b. gr.). No connection could be found between 

 the separate granules in the same rows or in successive rows, except 

 that afforded by the oblique fibers which will be described below. No 

 differences could be detected between the basal portions of the three 

 different groups of flagella. 



Oblique Fibers : The most superficial examination of this species 

 of Trichonynipha reveals a wonderful development of myoneme-like 

 fibers which cross and intercross in an intricate pattern over the entire 

 two-thirds or more of the surface of the body. A closer examination 

 brings to light three different sets of these fibers lying at different 

 levels, and all more or less visible in the living organism. The outer- 

 most layer of these is composed of oblique myoneme-like fibers and 

 will be described first. 



These lie immediately below the surface ridges and cover the same 

 portions of the body as do the other ectoplasmic structures (fig. B, 

 obi. /.). On plate 12, figures 79, 84, and 85, these fibers are shown 

 in dividing forms with the other ectoplasmic structures omitted. The 

 number of fibers or separate strands is somewhat reduced in the 

 drawing to obtain clearness, both in these figures and in others which 

 appear elsewhere on the plates. 



The oblique fibers arise from the darkly staining masses, the een- 

 troblepharoplast (fig. B, centrobleph.; pi. 6, figs. 7, 10), at the base 

 of the short, narrowed anterior part of the body. Figure 7, plate 6, 

 gives a vertical view of this region in an individual which had become 

 rounded up, preparatory to division. This condition results in a 

 spreading apart of the fibers, giving a clearer picture of these 

 structures than may be obtained in the ordinary trophozoite. Thick 

 strands stream out in all directions fi'om the irregular borders of the 

 centroblepharoplast, which soon break up into small threadlike 

 branches. At first longitudinal as they leave their place of origin, 

 this direction is lost with the first branching, the threads extending 

 obliquely and crossing and intercrossing with one another in a com- 

 plex, anastomosing network. Each intersection of two branches seems 

 to anastomose completely so that the course of a single branch is soon 

 lost. In addition to this network of fibers, very slender, minute 



