STRUCTURE AND DIVISION OF TRICHOMONAS 129 



close to the axostyle on its dorsal side. It is easily seen in the 

 region posterior to the nucleus, but its anterior extension is 

 frequently obscured (figs. 1, 2, 4, 7, 9, etc.). In some cases it 

 is traceable forward outside the nucleus up to the blepharoplast. 

 Posterior to the nucleus this row is nearly parallel to the longer, 

 more peripheral one. The inner row of granules is mentioned 

 and figured by Wenyon ('07) and by Kuczynski ('14), but seems 

 to be absent from the form described by Kofoid and Swezy ('15) 

 under the name of T. muris. 



In the region between the nucleus and the blepharoplast 

 there are often additional granules similar to those in the two 

 rows (figs. 7, 10, 14). The presence of these extra granules 

 often makes it difficult to determine the anterior limit of the 

 nucleus, on account of their resemblence to the granules of 

 chromatin within the nucleus and the faintness of the nuclear 

 membrane. 



The axostyle is a hyaline cylindrical rod attached to the 

 blepharoplast and it traverses the major axis to project sHghtly 

 at the posterior end, where it tapers rapidly to a sharp point. 

 At the point of emergence there is the ring of deeply staining 

 substance (text fig. A, A:) mentioned by Kofoid and Swezy. 

 In the region of the nucleus the axostyle is frequently somewhat 

 curved around that body which appears to lie slightly to the 

 left of it. The axostyle seems narrower in the region near the 

 blepharoplast than elsewhere. I have never seen any cases of a 

 capitulum in this species such as Kuczynski ('18) mentions. 



The flexibility of the axostyle is indicated by the frequent 

 occurrence in fixed material of a decided bend at the most 

 flexible region just posterior to the nucleus (figs. 2, 3, 11, 13, 

 15), but I have never seen this structure used as an organ of 

 locomotion, as maintained by Kofoid and Swezy ('15) for T. 

 augusta. 



There are no chromatic granules in the axostyle except in 

 new ones growing out from the blepharoplast in the telophase of 

 division. However, the deeper row of granules often appears 

 to be in contact with the axostyle in the region immediately 

 anterior to the nucleus (figs. 1, 2, 3, 7, 8, etc.). 



