PLATE XI. 



FIGS. 



1 and 2. Ascidia infi-na sp. nov. (p. 116) 1. Test, with 

 branchial aperture directed upwards : one and a 

 half times natural size. 2. Test of another indi- 

 vidual, with branchial aperture directed downwards: 

 natural size. 



3-5. Ascidia plebria Alder, (p. 117) 3. Test: natural 

 size. 4. Part of branchial sac : magnified. 5. 

 Ocelli : highly magnified. 



6 and 7. Ascidia xardida A. & H. (p. 119) 6. Tests of two 

 individuals: natural size. 7. Mantle of another 

 individual : natural size. 



8 and 9. Probably a variety of Corolla parallelogramma. 

 Views of test : one half natural size (8, right side ; 

 9, left side). 

 10. Afield ia ohliqna Alder, (p. 124) Test : natural size. 



