PLATE XXVI. 



PIGS. 



1-4. Molg id a siphonata Alder, (p. 53) 1. Test : natural 

 size. 2. Mantle : natural size. 3. Branchial 

 aperture : three times natural size. 4. Part of 

 branchial sac : magnified. 



5-9. Molgula citrina A. & H. (p. 62) 5-7. Views of 

 test: twice natural size. 8. Part of branchial 

 sac : magnified. 9. Larva : magnified. 



10-12. Eugyra arenosa A. & H. (p. 70) 10. Test : natural 

 size. 11 and 12. Views of mantle (11, right side ; 

 12, left side) : natural size. 



