XX 
ILLUSTRATIONS. 
Page. 
Fig. 250. Mesonea, new genus 763 
251. Pleuronea, new genus 765 
252. Genus Idmonea Lamouroux, 1821 771 
253. Idmidronea, new genus 786 
254. Genus Tervia Jullien, 1882 789 
255. Genus Prosthenoecia Canu, 1918 793 
256. Anatomy of the family Horneridae Gregory, 1899 794 
257. Genus Ilornera Lamouroux, 1821 797 
258. Genus Crassohornera Waters, 1887 801 
259. Genus Siphodictyum Lonsdale, 1849 802 
260. Genus Phormopora Marsson, 1887 802 
261'. Family Frondiporidae Busk, 1875 804 
262. Genus Frondipora Imperato, 1599 805 
263. Telopora, new genus 806 
264. Genus Fasciculipora D’Orbigny, 1846 807 
265. Forma Discofascigera D’Orbigny, 1852 808 
266. Forma Apsendesia Lamouroux, 1821 809 
267. Family Lichenoporidae Smitt, 1866 810 
268. Genus Lichenopora Defrance, 1823 814 
269. Zoarial forms of Lichenopora 816 
270. Orosopora, new genus 822 
271. Genus Trochiliopora Gregory, 1909 823 
272. Genus Conocava Calvet, 1911 823 
273. Leiosoecia, new genus 824 
274. Parleiosoecia, new genus 825 
275. Genus Tretocycloecia Canu, 1919 828 
276. Genus Ascosoecia Canu, 1919 832 
277. Forma Multicavea D’Orbigny, 1852 835 
278. Genus Parascosoecia Canu, 1919 838 
279. Genus Terebripora D’Orbigny, 1839 842 
