390 



Plate X. 



i-i«. 1 



1 d 



1 

 1 



1 h 



a. Kelepora lieiini<iiui King. i>ii Ihidrtiiilcs noirc- 

 gicti. Tlu' colony, of wliicli the uppermosl 

 part is removed, i.s attached l)y a hirge phite- 

 like expansion, formed b_v kenoziKVoia, and 

 the external snrface of the eolony is HUe- 

 wisc formed by a kenozooeeial layer. X I'i. 



b. The same species. ()(i-cia in different devel- 

 opmental stages. X 40. 



e. A developing colony of the .same species, 

 consisting of one ancestrula, two fully devel- 

 oped zocveia and two developing zoieeia. 

 X 40. 



A somewhat older colony of the same spe- 

 cies, in which a root-e.xpansion of kenozote- 

 cia is already formed. X 17. 



f. A young colony of the same species, viewed 

 from above. X 12. 



g. A portion of a root-expansion from the 

 colony in 1 d) more higlily enlarged. The 

 distal walls furnished with a uniporous 

 rosette-plate are seen between the youngest 

 developing kenozooccia and the kenozoa'cia 

 on the inner side. X 40. 

 A portion of the same expansion. A finished 

 kenozocrcium with avicularium is seen, and 

 besides, four developing kenozoacia, which, 

 like those shown in fig. 1 a, have had a 

 membranous cover, which has disappeared 

 after boiling in potash. X 40. 

 Reicpont cellnlosa Smitt. The proximal |)art 

 of an old colony cut acrcss transversally. 

 The superficial kenozooeeial layer is seen. 

 X 12. 



The same piece as shown in fig. 2 a, but the 

 transversally cut surface is seen. Tlic three 

 groups (2, 4, 6) of small round apertures, 

 almost in the centre of the section, are 

 intersected zod'cial chambers, which on both 

 sides are covered bv kenozocecia (see page 

 293). X 12. 



I'-ig. 2 



2 b 



2d 



— a a 



3 b 



4a 



4b 



4 c. 



4d 



A tiansverse scclicm thruugh a nnuii young- 

 ger portion of the same colony. The zoivcia 

 are also here on both sides covered by keno- 

 zocecia. X 12. 



A part of the transverse section in fig. 2 b, 

 more highly magnified. The separating walls 

 furnished with uniporous ro.sette-plates are 

 seen betwen the kenozotecia placed above 

 each other. X 40. 



Another part of the same transverse section, 

 in which the cavity of the kcnozooecia is 

 much narrower. X 40. 



Retcpora WallicliktiKi, Busk. Stalked oneeia. 

 X 40. 



A transverse section through a branch of 

 the same. Three zoa?cia and two kcnozorrcia 

 are cut through. X 40. 



A transverse section through a branch of 

 Rctepora tesselala Hincks. The small holes 

 are transverse sections of kenozocecia. X 2.'i. 

 A transverse section through a younger por- 

 tion of a colony of the same species. A layer 

 of zooecia and a layer of kenozocecia are 

 seen; in .some of the former the unijjorous 

 rosette-plate of the distal wall is seen. X 23. 

 A transver.se section through a colony of 

 the same species with two lavers of zocveia. 

 X 23. 



The same species. A portion of the keno- 

 zocreial layer. X 17. 



a. A transverse section through a colony of 

 Releponi lata Hincks. The small holes are 

 from kenozocecia. X 23. 



b. The same species. The zoa-eial layei', fron) 

 the basal surface, after detachment of the 

 kenozocecial layer. — 23. 



e. The same species. A part of a keiiozocveium 

 with avicularia from which poreeanals issue 

 to the surface. A covered avicularium is 

 visible in the distal part. X o.'i. 



