386 



Plate VIII. 



Fig. 1 a. Cellularia rigida, Mac Gilliv. 'I'hc tlirce zouecia 

 with oiccia. X 40. 



1 b. A longitudinal section through two zorecia 



with oa'cia (ov\ At the centre of the broad 

 di.stal part of each zooccium the narrow 

 proximal part of a neighbouring zoa-cium is 

 visible. X 40. 



— 1 c. A longitudinal section through a part of an 



intcrnode, wliich shows developing ocecia (ov). 

 X 40. 



— Id. The same species. A section parallel with 



the frontal surface to show the elongated, 

 narrow shape of the zofccia. X 40. 



— 2 a. Cellularia allanlica Husk). Four od'cial aper- 



tures arc seen. X 17. 



— 2 b. A longitudinal section through a colony of 



the same species. Developing ooecia are seen. 

 X 17. 



— 2 c. The same species, from the basal aspect 



after the removal of the basal surface. The 

 cavities of the zoiecia and the occcia arc vi- 

 sible, and here and there external ridges 

 which divide the frontal surface into areas. 

 X 17. 



— 3 a. Micropora Nonitaiii n. sp. witli calcified 



opercula. X 40. 



— 3 b. A longitudinal section through a zon?cium 



of tlie same s))ecies with oa-cium. X 40. 



— 4 a. A longitudinal section through a zoctcium 



of Micropora /lerforata (Mac Gilliv.), with 

 onccium. X 40. 



— 5 a. Foraniinella lepida (Hincks). A rudiment of 



an on?cium is seen uppermost. X 40. 



— 6 a. A colony of Chliilonia Cortlieri Aud. X 12. 



— 6 b. A colony of the same species with the bran- 



ches in one plane. X 12. 



— 6 c. An intcrnode (kenozoa'cium) of a main- 



branch with a zod'cium rising from it. The 

 segments indicated by «, /?, >' and d corre- 

 sjjond with similar segments in the inter- 

 nodes of the trunk and the main-branches. 

 X 55. 



— fid. A zoncciura, lateral view. The concavity of 



the frontal surface is seen greatly thickened 

 in its distal half; in the distal part of this 

 concavity a smaller one is .seen, correspond- 

 ing with the small distal pore in fig. 6 f . 

 Farther backwards is a connection between 

 the frontal concavity and the cavity of the 

 zooccium corresponding to the second pore 

 in fig. 6 f. d. w. — the distal wall. X 55. 



Fig. 6 e. Separating wall with rosette-plate in the 

 stolonate net-work. X 200. 



— (i f. A zoa-cium, from the frontal surface. X 55. 

 — - 6 g. Two internodes (kenozoa'cia) of a main-branch 



with some of the adjacent zooccia. X 75. 



— (1 h. The forked distal intcrnode of the stem. X 75. 



— () i. A |)ortion of tlie stolonate network with the 



proximal part of a stem. X 75. 



— ''>,i-ni. Cylindrical internodes being transformed 



into zo(ccia bj' the development of a cup-shaped 

 expansion (the zoiccinm in an embryo state) 

 from the proximal part of the intcrnode. 

 X 55. 



— 6 n-q. Cylindrical internodes which apparently 



are changing into zo(Pcia by a gradual swell- 

 ing of the intcrnode. X 55. 



— 6 r. A cylindrical intcrnode with its cup-shaped 



proximal expansion, from the frontal aspect. 

 X 55. 



— 6 s. A transverse section through a zocccium. 



Tlie thick frontal wall, the small concavity 

 (corresponding with the distal jiorc in lig. 

 6 f.) and the ro.selte-pIate of the distal wall 

 arc seen. X 55. 



— G t. An intcrnode of the stem, lateral view. Hc- 



tween /J and y a distal wall with a unipo- 

 rous rosette-plate is seen. The funnel-shaped 

 concavity is in communication through a 

 pore with the interior of the zocecium. X 75. 



— (in. An intcrnode of the stem, from the frontal 



surface. The oval funnel-shaped concavity with 

 its pore is .seen. X 74. 



— (i v. A quite young intcrnode of the stem, the 



walls of which are still very thin. On ac- 

 count of this the extent of the distal wall 

 (d. w.) is considerable, and the funnel-shaped 

 concavity is not yet developed. In its place 

 is found an oval opening. X 71). 



— 6 X. A young intcrnode of the stem, from the 



basal aspect. The uniporous rosette-plate is 

 seen as also the oval opening. X 75. 



— lly. A forked cylindrical intcrnode connected 



with two single ones. Between /i and y the 

 distal wall is seen with a uniporous rosette- 

 plate. X 100. 



— 7 a. A longitudinal .section through Foiwolnria 



rlliplica Busk. An avicularian chamber and 

 an otccium are seen. X 23. 



— 7 I). An articulated operculum of the same spe- 



cies. X 40. 



