Plate XV III 



W 



Chromosome groups of Metapodius, from WILSON (1909 ). 



t?, t/, g, j, m. First spermatocyte metaphase ; ^, ^, //, /-, , spermatogonial 

 inctaphase ; r, f t /', /, o, nuclei in growth-period. 



^ f, 2i-chromosome form; d -f y zz-chromosome form; g /', zj-chromo- 

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

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



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

 5, supernumerary chromosome. 



