418 



Plate XXIV. 



TiK. 1 a 



Concscharellina philippensis (Busk). Kive 

 zod'c-ia are seen from the basal side (after 

 the removal of the frontal wall) showing a 

 number of avicularian ehambers, wliieh 

 arc connected partly with the zo(Ccial sur- 

 face and partly with each other through 

 rosette-plates and pore-channels. There is 

 also seen one of the peculiar kenozotecia, 

 which are provided with a narrow semilu- 

 nate apci-turc. X 75. 



Discopora Sarsi (Sinitt) from Tassiusak, 

 Kast-Greenland. The ocecia show a more or 

 less developed txecial cover. X 40. 

 Hippojiodina fieijceitfis (Busk). X 40. 



3 b. The same species with avicularia but with- 

 out ooEcia. X 40. 



3 c. The same species with another form of 

 avicularia. X 40. 



3d. The same species with tlie avicularia in 

 another position. X 40. 



3 c. A mandible of the same species. X 75. 



3 f. A zooecium with o(ecium of the same spe- 



cies, seen from the left side-wall. X 40. 



4 a. Cheilopora simcra (Smitt). Two zocecia with 



oceeia seen from the left side-wall. X 23. 



5 a. Smiltina foliacea (Ellis & Sol.), with ooecia. 



2 a 



3a 



Only a very small proximal part of the 

 ectiHKVcium can be .seen, and the rest is 

 concealed by a tiipartite ocecial cover (sec 

 pag. 04). X"40. 

 Fig. 0—18. In the following diagrainmatie represen- 

 tations of difl'erent hyperstomial odcia the 

 black colour designates the calcareous parts, 

 the red the membranaceous and the non- 

 coloured |)ortion the muscular. The dotted 

 lines arc only hypothetical. Meference letters: 

 av. avieularium. ccto. Ectoo<L'cium. cndo. Kn- 

 oiceium. Cr. Cryptoeyst. c. m. Coveiiug mem- 

 brane o[). Ojierenlum. o. o. Oa'cial opercu- 

 lum, o. c. Oiecial cover, v. \'estil)uluni. 



— 0. Flustra nieiiibninaceo-lruncata (Smitt). 



— 7. FItisIra /hislroides (Hinck.sl 

 8. Fliistra foliacea L. 



— 9. Cohimnarid borealis n. sp. 



— 111. Onjichocclla sp. 



— 11. I'rceolipora nana Mac Ciill. 



— la. Onchopora Sinclairi (Busk). 



— 13. Biujiila sp. 



— 14. ThnlamoporeUa sp. 



— 15. EmlHillothcca (iiimlrata (Mac fiill.). 

 16. Cdllo/jora iiurila (Hincks). 



— 17. Scliizoporella unicornis Johnst). 



— 18. Myriozoian coarctalum Sars). 





