PLATE 11. 



Fig. 8. — Section of the "thick test" of //. johnsoni, showing the ab- 

 sence of blood Vessels. 



Fig. 9. — Section of the test of //. lumstor between the tubercles, show- 

 ing the comparative rarity of blood vessels. 



Fig. 10. — Section of the test, of H. haustor on one of the tubercles, 

 showing the abundance of vessels with the club-shaped terminals. 



[108] 



