XX ILLUSTRATIONS. 



Page. 



Fie:. 250. Mesonea, new genus 763 



251. Pleurouea, 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 



25U. Anatomy of the family Horneridae Gregory, 1899 794 



257. Genus Hornera Lamouroux, 1821 ./ 797 



258. Genus Oraasohornera Waters, 1887 801 



259. Genus Siphodictyum Lonsdale, 1849 802 



2i;i>. Genus I'horiuo}>ora Marsson, 1887 802 



261. Family Frondiporidae Busk, 1875 804 



2(12. Genus Frondipora Imperato, 1599 805 



263. Telopora, new genus 806 



204. Genus Fasciculipora D'Urbigny, 184G 807 



2i!5. Forma Discofascigera D'Orbigny, 1852 808 



2(!(i. Forma Apsendesia Lamouroux, 1821 809 



267. Family Lichenoporidae Smitt, 1866 810 



268. Genus Lichenopora Defrance, 1823 814 



2f!!). Zoarial forms of Lichenopora 816 



270. Orosopora, new genus 822 



271. ( Jenus Trochiliopora Gregory, 1 909 823 



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 812 



