PLATE XX. 

 THE BRANCHIAL TUBERCLE. 



FIG. 



1. Ascidia mentula Mull (p. 78) 



2. A. robusta Hanc. (p. 82) 



3. ,, another form. 



4. A. rubicunda Hanc. (p. 84) 



5. A. crassa Hanc. (p. 91) 



6. A. plana Hanc. (p. 96) 



7. A. sordida A. & H. (p. 121) 



8. A. canina Mull. (p. 124) 



9. A. Normani A. & H. (p. 134) 



10. A. affinis A. & H. (p. 137) 



11. A. elliptica A & H. (p. 142) 



All the figures much enlarged, but considerably reduced 

 from Mr. Hancock's drawings. 



