378 



Plate VI a. 



Fig. 1 a. Thalamoporella granulata n. sp. X 40. 



— lb. The same species, fi-om the basal surface. 



X 23. 



— 1 c. A gonozooecium of the same species with a 



developing ooecium. The gonozooecial oper- 

 culum is seen. X 40. 



— Id. An avicularian mandible of the same spe- 



X 55) 



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



— 2 a. Thalamoporella granulata, var. tubifera n. 



Within the aperture both of the zooecia and 

 of the avicularia, the remarkable continua- 

 tion of the polypide tube (t) with its frontal 

 aperture can be seen meeting the distal 

 wall. X 40. 



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



continuation of the polypide tube (t), which 

 sends a lateral branch to a rosette-plate in 

 two of the zooecia, is visible inside. This 

 continuation has a peculiar trapeziform shape 

 in the gonozooecium. X 23. 



— 2 c. A zooeciurh of the same form, lateral view. 



It is seen, that the continuation of the poly- 

 pide tube meets the basal part of the distal 

 wall. X 40. 



— 2d. Two gonozooecia of the same form with 



ooecia. X 40. 



3 c. 



— 3d. 



Fig. 2 e. Spicula of the same form. X 200. 



— 3 a. Thalamoporella novae hollandiae (Hasw.). 



X 40. 



— 3 b. The same species with a somewhat smaller 



avicularium. X 40. 



Two avicularian mandibles of the same spe- 

 cies. X 40. 



The same spedies, from the basal surface. 

 X 23. 



Another colony of the same species, from 

 the basal surface. X 23. 

 Spicula of the same species. X 200. 

 Thalamoporella Jervoisi (Hincks). X 40. 

 4 b. The same species from the basal surface. 

 X 23. 



Operculum of the same species. X 40. 

 Spicula of the same species. X 200. 

 Thalamoporella mamillaris (Lamx.). X 40. 

 Five opesiulse of different zooecia, to show 

 the variation in shape of the opesiular out- 

 growths and in tlie number and structure 

 of the protecting spinous processes. X 75. 

 An avicularium of the same species. X 40. 

 An avicularian mandible of the same spe- 

 cies. X 75. 



Spicula of the same species. X 200. 



3e. 



3 f. 



4 a. 



4 c. 

 4d. 



5 a. 

 5 b, 



5 c. 

 5d. 



5e. 



