416 



Plate XXIII. 



Fig. 1 a. A part nf the Uciinzocccial la^'cr of Kclcpoiti 

 lessclhilii lliiirUs. Tlirec i)f the kcnoZDfrcMa 

 are rmnislud witli avirularia, IVoiii whici'. 

 poivi-liaiiiuls pass i)Ut to tlic surface of tlic 

 Ucno/ou'i-ia. Four of tliesc pore-cliaiiuols arc 

 seen to perforate the lateral walls of the 

 adjacent Ucnozoceeia. The opercular area of 

 the avicularia is furnished with a well-de- 

 veloped crypfocvst. X 56. 



— 2 a. Two kcnozoa-cia from Reiepora lata UusU, 



seen from the inner concave surface. The 

 inner, in size strongly reduced, very irre- 

 gular cavities of the keiiozoa'cia arc con- 

 nected through pore channels perforating 

 the lateral walls. X 40. 



— 2 b. .\ third kenozoiceium of the same species, 



seen from the inner surface and in such a 

 position that the stratification of the basal 

 wall can be seen. The inner cavity, whicli 

 is nuieli larger than that in the two other 

 kenozocccia, is |)laccd near to the inner 

 suil'ace and there is seen a numbei' of pore- 

 channels and I'osette-plates corresponding 

 to the ea\ities in tlu" adjoining kenozoo-cia. 



X -lu. 



— 2 c. The same kenozoceeiujn seen from the left 



side-walL Seven single pored rosette-plates 

 are .seen, the five hindcrmost of which cor- 

 respond with the pore-cliamiels seen in the 

 left side of the fignie 2 b. X 40. 



— 3 a. A longitudinal section through a bi'anch of 



Hctipiira celliilnsa Smilt. On the right side 

 are seen the zocecia, while the rest of the 

 branch is formed by the kenozocecial layers, 

 the youngest of which have covered a S/ti- 

 rorbis. X 12. 



— 4 a. Rliynchopora aiujiilala n. sp. X 5.'). 



— 4 b. A ziKcciuni of the same species, seen from 



the left side-wall. On the left side is seen 

 an avicularium. X S.'i. 



— 4 c. Zocecia of the same species, seen from the 



basal side after removal of the basal wall. 

 X .■).'). 



l-ig. 4d. 



— 4 e. 



— 4 f. 



— 7 b. 



— 7 c. 



— 7d. 



— / t 



— 8 a 



— Hb 



— 9 a 



— 10 a 



— 11a 



Zonecia of the same species with ixrcia. 



X :>.■). 



The same species The aperluic with Ihc 

 opei'culum in siln. The beaded \eslibnlar 

 ai'ch is seen shining thi'ough the n|)ercuhnn. 

 X 100. 



The same s])ccies. Onecium, seen a little 

 from the proximal part to make the screen- 

 like frontal lobe more distinct. This lobe 

 cannot be seen in fig. 4 d. X 55. 

 Operculum of the same species. X 100. 

 Avieularian mandible of the same species. 

 X 100. 



Operculum of Rht/ncliojiora scinlillans 

 (Hincks). X 140. 



Two zocccia of Microiiorrlla Ihihclliin'nt n. 

 sp. X 40. 



The same species. .A zocecium with iKcciiim. 

 X 40. 



Oi)ei'culum of the same s])ecies. X 75. 

 Concscliarellina antfulopora (Ten-Woods). 

 Between the two avicularia is seen one of 

 the peculiar crescentic apertures, belonging 

 to certain kcnozooecia. X 75. 

 The same species. A crescentic aperture 

 and two avicularia. X 75. 

 Opercidum of the .same species. X 100. 

 A transverse section of the same operenlnm. 

 X 200. 



The aperture of the same species. X 75. 

 An avieularian mandible of the same spe- 

 cies. X 200. 



Conescliarellina ciiiuclliila (linsk). Occeium. 

 X 55. 



An on'cium of the same spe«ies, from the 

 .side. X 55. 



Adeonello])sis foliacea Mae dill. Four zoie- 

 cia and a gonozoircium, X 40. 

 A part of the frontal surface of AiKirllira- 

 pora inoiwdon IJusk . X 200. 

 A part of the frontal surface of Invcrsiuhi 

 iniHTsii iWalers . X 200. 



