382 



Plate VI c. 



Kig. 1 a. Thalamoporellu Harmeri n. sp. X 2;!. 



— 1 b The same si)ccies witli aviciilarium. X 40. 



— 1 e. Tlic distal end of a zooccium of the same 



species. X 55. 



— 1 (1. An operculum of the same species. X 100. 



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



devclopinn ooecium. The gonozorecial oper- 

 culum is seen. X 40. 



— If. Zoa'cia 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. Aspidostoiua giganteuni (15iisU\ Two ooeeia 



are seen. X 23. 



— 2 b. A longitudinal section through two zooecia 



of the same species. X 23. 



— 2 c. A transver.se section through two zoiccia of 



the same species. Uppermost a distal wall 

 is seen and to the left of this the arched 

 distal end of the zoircium. Further down 

 an intersected polypide tube is seen and 

 on eacli side of tliis a recess whicli extends 

 to the basal wall. X 23. 



— 2 d. A transverse section through a zoa'cium of 



the same species. The median projection of 



seen beneath tlie polypide 



the zooecium 

 tube. X 23. 



Fig. 3 a. Aspidostoma ''!'< Aef/on (d'Orb.). The two 

 projections at the ])roximal part of the oce- 

 cium are united so as to form an arch- 

 shaped belt which covers the aperture of the 

 gonozo(Eciuni. To the left a gonozo(eciuni is 

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



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



])rojections at the proximal j)arl of the 

 0(eeium have not united. X 40. 



— 5 a. Aspidostoma l? Atahiniha id'Orb.^ with ooe- 



eia. X 4(1. 



— 5b. The same species withovit oiecia. X 40. 



— 6 a. Aetea dilaiatti Husk. The incrusting portion 



of four zoircia. The opening near the distal 

 wall is from the broken perpendicular part 

 of the zooecium. X 40. 



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



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



part of a zotecium on the border of the 

 dilated distal end. The dark lines and spots 

 are uncalcitied areas. Immers. 



— 6(1. A part of the surface of the incrusting part 



of a zooecium. Immers. 



