59 



of the colony. In some species, Fl. denticiildta (I'l. I, fig. 9 c), Fl. florea and partly 

 in Fl. fliistroides (PI. I, lig. 4 b) tlie oa'cia are situated inside (he avicularia. 

 With exception of the Farcimiiiaria species (PI. I, figs. 10 a — 10 d), in whicli the 

 ocTcium is enclosed in a kenozooecium, tlie ocecia in the other members of the 

 family Farcimimtiiidae seem to have essentially the same structure as in the 

 Fhistridae, but all of them project more or less on the surface of the colony. In 

 the species of the genus Columnaria n. g. (PI. I, figs. 12 a — 12 d; PI. XXIV, fig. 9), 

 a part of the inner (basal) wall of the ocecium is on each side covered by a 

 triangular cryptocyst-plate, which from each of the lateral l)orders of the zoa'cium 

 pushes itself in between the ectoooecium and the endoon^cium and in Nellia 

 simplex var (PI. XXII, fig. 6 a) the frontal wall of the ocrcium is provided with 

 a cryplocystic belt, like that founil in many Flnstridac. I must also refer to this 

 group the ooecia in Micropora Nonnani (PI. Vlll, figs. 3 a, 3 b), Micr. perforata 

 (PI. VIII, fig. 4), liosselia Rosseli, Biujidopsis Peachii, Buy. ciispidata, Menipea cervi- 

 coriiis (PI. II, iig. 4 b), M. Bu.ski (PI. II, fig. 3 c), Urceolipora nana (PI. XV, figs. 

 la — 1 c, PI. XXIV, fig. 11), Cheilopora sincera (PI. XXIV, fig. 4a), Gephyrophora 

 polijmorpha, the oa'cia in the species of the genus Oniichocella (PI. XXII, figs. 3 a — 3 b, 

 PI. XXIV, fig. 10), in all members of the family Sclerodomidae (PI. XIX, figs. 

 18 a, hS b), as also in numerous members of the family Catenariidae, for in- 

 stance in Hincksiella pnlchella (PI. XII, fig. 9 a), the sj)ecies of the genus Ptero- 

 cella (PI. XII, figs, oa, 6a), most of the Catemiria species, (PI. XIII, figs. 2a, 3a, 3b) etc. 

 In the majority of the mentioned forms the ocecium projects more or less notice- 

 ably on the surface of the respective zocEcium, and it is only in a small number 

 of cases, e. g. in Urceolipora nana and in the mentioned species of the Catenariidae, 

 that it is ([uite hidden within this. While in a number of cases we only have to do 

 with a membranous ectoocecium, as in Micropora perforata, Bnyulopsis Peachi, 

 Cheilopora sincera, etc., the ectoooecium in others is wholly or jiartially calcified, 

 e. g. in the mentioned Calenariidae, in Biiguhpsis cuspidala and Menipea cervi- 

 cornis. Finally, in both cases there may appear between the endoooecium and 

 the eclooa'cium a more or less developed cryptocyst, as in Bay. cnspidata. 

 Menipea cerricornis and Gephyrophora polijmorpha^ . in the last of which the crypto- 

 cyst covers the whole frontal wall of the endoooecium. The cryptocyst in Urceoli- 

 pora nana on the other hand has (juite a dilTerent position, as it here covers the 

 basal wall of the owcium right down to the place where the oa>cium issues from 

 the short horizontal portion of the distal wall. 



b) Endozooecial ooecia, which are surrounded by kenozooecia or heterozooecia. 



' no, PI. 11, fig. 22. 



