Studies on Chromosomes 205 



22 M. femoratus (No. 42), 26-chromosome form, four large supernumeraries; second division show- 

 ing hexad element formed by the idiochromosomes and supernumeraries (Fig. 10, h). 



23 From the same cyst, similar view (Fig. 10, k~). 



24 M. terminalis (No. 3, Montgomery's material), 2i-chromosome form, nucleus from the growth- 

 period, showing single spheroidal chromosome nucleolus (like Fig. 3, /). 



25 M. femoratus (No. 29), 22-chromosome form, growth-period, showing double chromosome- 

 nucleolus (idiochromosome-bivalent) and plasmosome (Fig. 6, 6). 



26 From the same slide, showing different ordinary chromosomes, separate chromosome-nucleoli 

 and plasmosome (Fig. 6, c). 



27 M. terminalis (No. 20), ^-chromosome form, growth-period, showing tripartite chromosome- 

 nucleolus formed by the idiochromosomes and supernumerary (like Fig. i, /). 



28 M. granulosus (No. 60), 26-chromosome form, growth-period, showing hexad chromosome- 

 nucleoli from three different cells (like Fig. 10, j-). 



29 M. terminalis (No. 2), 23-chromosome form, one small supernumary; spermatogonial group, 

 showing three small chromosomes (the supernumerary and two m-chromosomes); the small idiochromo- 

 some distinguishable above towards the left (Fig. 7, y). 



30 M. terminalis (No. 22), 24-chromosome form, one small supernumerary and one large (Fig. 1 1, p) 



