380 



Plate VI b. 



Fig. 1 a. Thalamoporella Rozieri (Aud.), var. prominens 

 n. An irregularly jointed colony. X 12. 



— lb. The same form. X 40. 



— 1 c. Zooecia and an avicularium of the same 



form, lateral view. X 40. 



— Id. An operculum of the same form. X 75. 



— 1 e. The same form from the basal surface. X 40. 



— If. Spicula of the same form. X 200. 



— 2 a. Thalamoporella Rozieri (Aud.), var. eali- 



fornica n. X 40. 



— 2 b. Ooecia of the same form, of which the dis- 



tal only appears as a rudiment. The distal 

 gonozooecium is furnished with an oper- 

 culum. X 40. 



— 2 c. Chitinous thickenings on the gonozooecial 



operculum. X 100. 



— 2d. The same form from the basal surface. 



X 40. 



— 3 a. Thalamoporella Rozieri (Aud.), var. sparsi- 



punctata n. X 40. 



Fig. 3 b. The same form from the basal surface. 

 X 40. 



— 4 a. ThalamopOTella lioticha (Ortm.). A row of 



zooecia, from the basal surface. X 23. 



— 5 a. Thalamoporella expansa n. sp. X 17. 



— 5 b. Operculum of the same species. X 40. 



— 5 c. The same species from the basal surface. 



X 17. 



— 5 d. Au avicularian mandible of the same spe- 



cies. X 40. 



— 5 e. Spicula of the same species. X 200. 



— 6 a. Thalamoporella falcifera (Hincks). X 40. 



— 6 b. The same species from the basal surface. 



X 40. 



— 6 c. An avicularian chamber of the same spe- 



cies. X 55. 



— 6 d. An avicularian mandible of the same spe- 



cies. X 75. 



— 6 e. Spicula of the same species. X 200. 



