REACTIONS TO LIGHT IN LARVAE OF ASCIDIANS 



151 



surface as the abocular side. These two sides continue pos- 

 terioiiv in the two flat surfaces of the tail. 



p -A 



-^', 



— t 



0.5 mm. 



Fig. 1 Camera outlines of tadpole of Amaroucium pellucidum as seen from 

 three different surfaces, t, tail; n, notocord; e, eye; I, lens; p, pigmented eye-cup; 

 s, statolith; mm, projected scale. 



The eye consists of a, cup-shaped pigmented structure partially- 

 surrounding a hyaline lens structure (fig. 2). The pigmented 

 cup contains a number of pores through which nerve proc- 

 esses pass, ending on the inner surface. The opening of the cup 



