774 



ON THE CH^TOSOMATID^, 



in the middle region of the body, the ridges, especially the lateral 

 ridges, are only recognisable as thin strands containing a few 



Figs. 9-11. —Ch. fa/catum. 



Fig. 9. — Horizontal, longitudinal section through head; ( x 880). 



Fig. 10. — T.S. through rostrum, showing insertion of dorsal seta?. 



Fig. 11. — T.S. through anterior extremity of head, showing mouth-open- 

 ing, and cut ends of dorsal seta?; c.})., cuticle lining pharj'nx; /,t"., 

 bands attaching pharynx to body-wall; (/. c. , glandular cells surround- 

 ing anterior end of pharj'nx; mJ., tissue surrounding mouth-opening. 



deeply stained nuclei and granules (Text-figs. 14, 15). The dorsal 



