382 



Plate VI c. 



Fig. 1 a. Thalamoporella Harmeri n. sp. X 23. 



— lb. The same species with avicularium. X 40. 



— 1 c. The distal end of a zooecium of the same 



species. X 55. 



— Id. An operculum of the same species. X 100. 



— 1 e. The same species. A gonozooecium with a 



developing ooecium. Tlie gonozooecial oper- 

 culum is seen. X 40. 



— If. Zooecia of the same species, from the basal 



surface. X 40. 



— 1 g. Zooecia from another part of the same colony, 



from the basal surface. X 40. 



— 1 h. Spicula of the same species. X 290. 



— 2 a. Aspidostoma giganteum (Busk). Two ooecia 



are seen. X 23. 



— 2 b. A longitudinal section through two zooecia 



of the same species. X 23. 



— 2 c. A transverse section tlirough two zooecia of 



the same species. Uppermost a distal wall 

 is seen and to the left of this the arched 

 distal end of the zooecium. Further down 

 an intersected polypide tube is seen and 

 on each side of this a recess which extends 

 to the basal wall. X 23. 



— 2 d. A transverse section through a zooecium of 



the same species. The median projection of 



the zooecium is seen beneath the polypide 

 tube. X 23. 

 Fig. 3 a. Aspidostoma (?) Aegon (d'Orb.). The two 

 projections at the proximal part of the ooe- 

 cium are united so as to form an arch- 

 shaped belt which covers the aperture of the 

 gonozooecium. To the left a gonozooecium is 

 seen, on which this belt is broken. X 40. 



— 4 a. Aspidostoma (?) Antiopa (d'Orb.). The two 



projections at the proximal part of the 

 ooecium have not united. X 40. 



— 5 a. Aspidostoma (?) Atalantha (d'Orb.) with oce- 



cia. X 40. 



— 5 b. The same species without ooecia. X 40. 



— 6 a. Aetea dilatata Busk. The incrusting portion 



of four zooecia. The opening near the distal 

 wall is from the broken perpendicular pai-t 

 of the zooecium. X 40. 



— 6 b. A distal wall with rosette-plates. X 200. 



— 6 c. A part of the surface of the perpendicular 



part of a zooecium on the border of the 

 dilated distal end. The dark lines and spots 

 are uncalcified areas. Immers. 



— 6 d. A part of the surface of the incrusting part 



of a zooecium. Immers. 



