1919] Kofoid-Swezy: Triclwnympha campanula 53 



branches are being continuously given off whicli pass to the surface 

 along the ridges (pi. 6, fig. 9). The basal granules of the flagella 

 seem to be connected with these minute branches, as in optical section 

 the flagella are seen to be continuous with the branches that are given 

 off by the oblique fibers. In cross-sections of the body this connection 

 could not be followed, owing apparently to decolorization in the 

 staining methods used. 



The structure of these fibers is scarcely granular and presents a 

 more nearly homogenous appearance than is the case with either the 

 transverse or the longitudinal myonemes. In the living organism they 

 may be seen as very slender refractive lines. In preparations stained 

 with iron haematoxylin they are very distinct as greyish lines, darker 

 in the anterior region. Owing to their affinity for this stain a con- 

 siderable degree of decolorization is required before they lose the 

 black color. "With Mallory's connective-tissue stain these fibers 

 usually, though not invariably, show a clear red color similar to that 

 found in the neuromotor apparatus of eiliates. 



Centroblepharoplast : Intimately related to these fibers is an- 

 other structure at the anterior end of the body which we have called 

 the centroblepharoplast, an organelle homologous with the blepharo- 

 plast or centroblepharoplast found in other flagellates (Kofoid and 

 Swezy, 1915)', and suggestively like the motorium in eiliates (Sharp, 

 1914, Yocom, 1918), although that organ has no proven relations to 

 mitosis as has this structure. Owing to the staining reactions and 

 apparent structure of the oblique fibers first described, it seems prob- 

 able that they are, of all the neuromotor apparatus, most intimately 

 associated with the centroblepharoplast as well as with the flagella. 



The anterior end of the body becomes narrow, sometimes with a 

 slightly constricted appearance (pi. 6, fig. 6), but usually subconical 

 in outline (pi. 6, figs. 1, 2). The ectoplasmic zone is here much 

 thicker than in other regions of the body. In the center of the ter- 

 minal cone is a slender cone-shaped structure composed of several 

 strands of darkly staining material surrounding a central core which 

 does not stain (fig. B, core; pi. 6, figs. 1, 6). This reaches the tip 

 of the cone, where it may terminate in two ways. The first of these 

 presents a ringlike appearance in vertical view, with the central core 

 of endoplasm showing in the center as a light area (pi. 6, figs. 3, 7). 

 This is a circular band around the core, to which the radiating 

 strands of the oblique fibers are attached at their anterior ends. The 

 second method is generally found in division stages and .shows the 



