384 



Plate VII. 



rig. 



Id. 

 •2 a 



2 b. 



1 a. Macropora centralis Mac Gilliv. X 23. 

 1 b. Tbe apeiture of a special form of /.occcium 

 (avicuiariiiin '? of the same .species. X 4(1. 



1 c. Au operculum with its surrouiuliiit;s of the 



same species. X 40. 



\ pore-chamber of tlie same species. X 40. 

 Miiiihranicellnrid diibki lUusk), with cxecia. 

 the clongatcil he.vafjoiial zocrcia are partly 

 visible throuj^li tlie frontal surface, wliich 

 is divided into hexagonal, rliombic areas. 

 X 17. 



The same species from the basal aspect 

 after removal of the basal surface. The 

 cavity of the eloufjated zoa'cia is visible and 

 the hexagonal, rhombic areas of the frontal 

 surface are seen at the same time. On the 

 distal portion of each zoa-cium an oceciuni 

 (,0V.) with its oblique, basal surface is seen. 

 X 17. 



2 c. Zooecia of the same species with o<rcia. The 



covering membrane is removed. X 17. 

 2 d Hosctte-plates of the same sjjecies. X 7.'). 



2 e. Zod'cia of the .same species. The separating 



walls of the elongated zo(Ccia arc visible 

 through the frontal surface, divided into 

 broad areas. X 17. 



3 a. Alysidium parasiticum Bunk. A gonozocecium 



with a double-valved oa'cium is seen on 

 the lowermost zocrcium. X 40. 

 3b. A zocccium of the same species. X 75. 



A zotccium of the same species from the 

 basal surface. The bent distal wall is seen. 

 X 75. 



A longitudinal .section through a zooecium 

 of the same species. X 75. 

 A gonozocecium of the same species from 

 the frontal oceciabcaring surface, after the 

 removal of the oa-cium. The two elongated 

 openings are seen, through which the nn;- 

 cial valves have been in communication with 

 the pore-chambers of the gonozodcium. X 75. 

 A transverse section through the distal end 

 of a zod'cium. A row of uniporous rosette- 

 plates is (very indistinclj' seen. X 75. 

 The end of a branch of the same species 

 with a cylindrical internode. X 40. 



— 3c 



— 3d. 



— 3e. 



3 f. 



3g. 



Fig. 3h. A gonozocecium with the o(Ccial valves open. 

 X 55. 



— 3 i. An oo-'cial \al\c tVoni the internal surface. 



X 55. 



— 3 j. A gonozocecium with ocecium, seen from the 



basal edge. X 40. 



— 3 k. A gonozocecium with developing ocucial 



valves, lateral view. A lateral pore-clianiber 

 and a part of the basal one are seen. X 75. 



— 3 1. The same gonozocecium, from the basal 



edge. X 75. 



— 3 m. The stem of the gonozocecium. The distal 



wall (,cl. w.j and a uniporous rosette-plate 

 are seen. X 75. 



— 3n. The stem of the gonozocecium, lateral view. 



Opposite the pro.ximal part of the oval de- 

 pression the oblique distal wall is seen. X 75. 



— 3 o. An oblique section through the middle part 



of the stalU-like kenozocccium, seen from 

 the basal surface. The three rosette-plates 

 of the distal wall are seen. X 75. 



— 4 a. A longitudinal section through Celliilariii 



oustralis Hincks. Above the majority of the 

 zocccial chambers an ooecium (ov.) is seen. 

 X 23. 



— 4b. A transverse section thiough a portion of 



the same species. The ocecial cavity (ov.) 

 and the arched rosette-plates of the lateral 

 walls are seen. X 40 



— 4 c. A transverse section through a portion of 



the same species. The ocEcial cavity (ov.) 

 and the rosette-plates of the distal wall are 

 seen. X 40. 



— 4d. A portion of a longitudinal section of the 



same species, more highly magnilied. A 

 zocecium with two rosette-plates and an 

 ocecium (ov.) are seen. X 40. 



— 4 c. A longitudinal section through the proximal 



part of an internode of the same species. 



— 4 f A longitudinal section through an internode 



of the same species, showing developing 

 oircia (ov.). X 23. 



— 5 a. A row of zocecia of Celliilariu /istiilosa (?) 



(L.) with ooecial fissures. X 40. 



