EXPLANATION OF PLATE LXXVII. 



POLYZOA. 



Fig. 6a. Bipora eburnea, Map], (portion of upper surface) — x 50. 

 ,, 61). ,, ,, (portion of under surface) — x 26. 



,, 7. Bipora mamillata, Map], (portion of upper surface) — x 50. 



,, 8. Selenaria nitida, Mapl. (portion of upper surface) — x 50. 



