CHROMOSOMES IN COREID HEMIPTERA. 



1 03 



accident of technique, the microtome^knife tearing/a chromosome 

 in half as it passed through the block, or it may be the result of 

 an abnormality in a previous division. There were no other 



j& 



Kn.. s. I i;.j d tri.\tis. Chromosome-groups of embryonic cells, a-h, 21- 

 Miii-.'iiu' t\ p< ,1. b, c. d, e and/, from the same embryo; g and h, from anothrr 

 <iiil>i\.. i. i \..ptional group with twenty-three chromosomes. 



in tin- immediate vicinity from which an extra chromo- 

 i ould have been derived. The chromosome groups repre- 

 iii Fii^. 8 and 9 were selected from a large number of 



