B 



Fig. 219. Diagrams of the antennal gland of the early metanauplius of 

 Estheria. After Cannon. A, The whole gland. B, The sphincter in section. 

 duct, intracellular ectodermal duct; ect. ectoderm; sac. end sac (coelomic); 

 sph. sphincter cells. 



Fig. 220. Diagrams of the green gland oiAstacus. From Parker and Haswell, 

 after Marchal. I, The organ unravelled. II, A section of the organ with the 

 parts in their natural positions, bl. bladder; c.p. cortical (green) portion of the 

 gland; d. terminal duct; s. end sac; w.p. medullary (white) portion of the 

 gland. 



