Plate 41 



Figs. 1-3. Smittina trispinosa Johnston, 1838 (p. 340). 



1. Zooecia of the incrusting zoarium, X20, with two giant cells. 



D. 5311. China Sea, vicinity of Hong Kong. 



2. Ovicelled zooecia, X20, of the typical form. 



D. 5145. Jolo Light, Jolo. 



3. Ancestrular zooecia, X20. The avicularium is not developed. 



D. 5311. China Sea, vicinity of Hong Kong. 

 4, 5. Smittina trispinosa munita Hincks, 1884 (p. 341). 



4. Incrusting ovicelled specimen, X20. 



5. Croup of zooecia, X20, exhibiting the avicularia, a rare occurrence. 



D. 5179. Romblon Light, Romblon. 

 6-12. Smittina trispinosa nitida Hincks, 1881 (p. 343). 



G. Much calcified specimen, X20 ,with large areolar pores. 



D. 5145. Jolo Light, Jolo. 

 7. Unilamellar, cylindrical specimen, X20. The avicularia are rare. 

 S. Ancestrula and ancestrular zooecia, X20. 



D. 5151. Sirun Island. 

 9. Group of short zooecia, X20, with two or three spines. 



D. 5147. Sulade Island. 



10. Incrusting specimen, X20. Variation with giant cells. 



D. 5179. Romblon Light, Romblon. 



11. Group of zooecia, X20, showing the usual irregularity of the species. 



D. 5137. Jolo Light, Jolo. 



12. Normal zooecia with superposed aberrant zooecia, X20. 



D. 5577. Mount Dromedario. 

 13, 14. Smittina trispinosa acuta, new variety (p. 344). 



13. Marginal zooecia, X20, of the incrusting zoarium with the thin 



avicularium attached to the proximal border of the peristome. 



14. Group of ovicelled zooecia, X20. 



D. 5217. Anima Sola Island. 



(60S) 



