Plate XV III 



f*m% 



J:> 



Chromosome groups of Metapodius, from WILSON (1909 b}. 



a, d, g, j, m. First spermatocyte metaphase ; ^, e, h, k, n, spermatogonial 

 metaphase ; c,f, i, I, o, nuclei in growth-period. 



a c, 2i-chromosome form; d -f, 22-chromosome form; g /, zj-chromo- 

 some form, one supernumerary ; J /, 24-chromosome form, two super- 

 numeraries ; m o, 25-chromosome form, three supernumeraries. 



/, /. Large and small idio-chromosomes ; m, #z-chromosome ; />, plasmosome ; 

 s, supernumerary chromosome. 



