PLATE XXIV. 



FIGS. 



1-6. Molgula complanata A. & H. (p. 45) land 2. Views 

 of mantle, the test removed from the surface seen, 

 but showing along the margin : six times natural 

 size. In fig. 2, x is some foreign body inside the 

 mantle. 3 and 4. Mantle laid open, exposing (in 

 3) digestive and reproductive organs, and (in 4) 

 branchial sac : about eight times natural size. 5. 

 Liver : magnified. 6. Larva : magnified. 

 7-10. Moh/nla ocnlata Forbes, (p. 48) 7 and 8. Views of 

 mantle (7, left side; 8, right side) : about two-thirds 

 natural size. 9 and 10. Mantle laid open, exposing 

 (in 9) digestive and reproductive organs, and (in 

 10) branchial sac. 



