PLATE 6 



EXPLANATION OF FIGURES 



(Acridium granulatus) 



42 Proctodeal cell from same animal as figure 23. Deficient no. 4. 



43 Proctodeal cell. 



44 From the hypodermis. Contains many pigment granules. 



45 Hypodermis. 



46 Giant cell from 'fat body.' Twenty-six chromosomes. 



47 Hypodermis cell. 



48a and b Proctodeal or connective-tissue cell in contact with muscular 

 coat of intestine. 



49 From the 'fat body.' 



50a and b From hypodermis. 



51 to 54 From female. Ovarian follicle cells. Fourteen chromosomes in 

 each. The two sex chromosomes (2x) may be recognized by their looser, more 

 faintly stained character. A precocious synapsis of the no. I's in figure 51. 



290 



