PLATE XVI. 



FIGS. 



1-3. AscidiapimtulosaA.lA.eT. (p. 138) 1. Test : natural 

 size. 2. Mantle : two-thirds natural size. 3. 

 Part of branchial sac : magnified. 



4-7. .4. elliptica A. & H. (p. 140). 4. Test : twice 

 natural size. 5. Mantle : twice natural size. 6. 

 Part of branchial sac : magnified. 7. Part of the 

 same ; side view : magnified. 



8 and 9. A. pellucida A. & H. (p. 142) 8. Test : twice 

 natural size. 9. Branchial aperture showing seven 

 ocelli in place of the usual eight : magnified six 

 diameters. 



