THE PHYSIOLOQY OF ASCIDIANS
95
( b l
FIG. 26. Ssii.so organs in Cioncc intmtirtcilin. (a) Position of ocolli twtwocn Riphonal
lohos: (b) an ocullus in longitudi~ial section; (c) cupnla organ. f, flag of test suhstance; 0, ocallue; p, p i p o n t colls: H, wrisory cells; t , tent. ( (a) nnd (c) redrawn
from Milhr, 1959: (b) rcrdrnnri froin HUIIN. 1937.)