or Little Known, Polyzoa. 113 



Explanation of Figukes. 



Plates I. and II. 



Opercula and Chitinous Appendages. 



Fig. 1. Retepora monilifera. 



Fig. 2. R. monilifera, var. sinuata. 



Fig. 3. R. monilifera, form munita, var. lunata. 



Fig. 4. R. monilifera, form munita, var. acutirostris. 



Fig. 5. jR. monilifera, form umbonata. 



Fig. 6. R. formosa. 



Fig. 7. i2. aurantiaca. 



Fig. 8. i2. porcellana. 



Fig. 9. i2. porcellana, var. Zasca. 



Fig. 10. i2. carinata. 



Fig. 11. i£. granulata. 



Fig. 12. i£. serrata. 



Fig. 13. i2. phcenicea. 



Fig. 14. i2. tessellata. 



Fig. 15. ifoj^sa. 



Fig. 16. jK. avicularis. 



Plate III. 



Fig. 1. Retepora monilifera, young cells. Fig. la. Adult 



cells. Fig. 16. Portion showing ovicells. 

 Fig. 2. i2. monilifera, var. sinuata. 

 Fig. 3. jR. monilifera, form munita, var. acutirostris. 

 Fig. 4. jR. monilifera, form munita, var. lunata. 

 Fig. 5. i2. monilifera, form umbonata. Fig. 5 a. Young 



cells. Fig. 56. Ovicell in profile, to show the umbo. 

 Fig. 6. .R formosa, young cells. Fig. 6<x. Older cells and 



ovicell. 

 Fig. 7. i2. ^ssa, var. marsupiata (?) 

 Fig. 8. i2. carinata. 



