1919] 



Kofo id-S wezy : Trichom it us term it id is 



33 



gradually spread out below the paradesmose as though hung across 

 a string suspended from its ends (pi. 3, figs. 10, 12, 13). 



The number of chromosomes is rather obscure since the loops are 

 at all times rather closely entangled. It appears to be twelve or 

 thereabouts. In the earlier phases each is composed (pi. 3, fig. 10) 

 of a line of distinct granules, like chromomeres, but these fade out as 

 the metaphase approaches. 



Fig. B. Development of paradesmose in Trichomitus termitidis. 1. Out- 

 growth of new parabasal body after separation of eentrosome and blepharoplast 

 and division of latter. 2. Centrosome divided and paradesmose forming be- 

 tween them; new flagella and undulating membrane formed. 3. Elongation of 

 paradesmose as it moves down to the nucleus with the lengthening of the 

 eentrosome-rhizoplasts. 4. Later stage of same, condensing chromatin in nucleus 

 with cone-shaped projection starting towards the nuclear membrane and parades- 

 mose. 5. Paradesmose attached to nuclear membrane. 6. Attachment of central 

 chromatin mass to paradesmose and formation of spindle; beginning of formation 

 of chromosomes. X 1575. 



The metaphase is obscured by the fact that there appears to be 

 no arrangement of the chromosomes in an equatorial plate and no 

 amphiaster phase of the nucleus. The nuclear structures appear to 

 conform their arrangement to the stout bar-shaped paradesmose and 

 not the latter mould itself to the configuration of the nucleus as in 

 Trichomonas and Eutrichomastix (Kofoid and Swezy, 1915). 



