ORDER II 



CYCLOSTOMATA 



321 



aimnged in regular, spiral or transverse linear series, and closely situated. , ZocEcial 

 tubes disposed aljout a definite central axis or axial tube. Jurassic to Recent. 



Diploclema Ulr. Similar to Entalophora, but Avith branches spreading in the 

 same i)lane, slightly compressed, and divided into two equal parts by a wavj' mesial 

 lamina. Silurian. 



Haplocecia Gregory. Like Spiropora, but distal ends of zocccia are angular. 

 Jurassic and Cretaceous. 



Mitoclema Ulrich. Ordovician. Clonopora Hall. Devonian. Peripora d'Orb. 

 Cretai/eous. 



Rhipidojjora and Glinopora Marsson; Siphoniutyphlus Lonsdale; Clypeina Michelin; 

 Umbrellina Roemer. Cretaceous and Tertiary. 



Family 5. Fasciporidae d'Orl)igny (emend.). 



Zoojcia tubular, opening in clusters at the 

 (jrowing extremities, and in linear or quincuncial 

 series on the sides of the lamelliform, or obconical 

 zoaria. Accessory pores wanting. Cretaceous. 



Fascipora d'Orb. (Fasciporina d'Orlx). Zoaria 

 compressed, sub-ramose to lamelliform. Aper- 

 tui'cs arranged quincuncially or somewhat ir- 

 regularly on both sides, and on the more or less 

 expanded growing extremities of the branches 

 and lamellae. The lamelliform species resemble 

 Diastopora, but are without a mesial lamina. 



Semifascipora d'Orb. (Fig. 446). Zoaria cup 

 or funnel-shaped, with only the outer surface 

 poriferous, the inner covered by an epitheca. 

 Poriferous face thrown into vertical ridges 

 bearing the salient tubular mouths of one or 

 more rows of zocecia. At the upper edge the ridges pass into large clusters of apertures. 



Gonotuhigera and Serietuhigera d'Orb. Closely related to the preceding. 



Fio. 446. 



Semifascipora variabilis d'Orb. Cretaceous ; 

 France. Side view of zoarium, lo/j. 



Fig. 447. 



Fasciculipora incrassata d'Orb. Upper 

 Cretaceous ; Meudon, near Paris. Terminal 

 fragment, nat. size and enlarged (after tiarv 

 d'Orbigny). •'' 



Family 6. Fascig-eridae d'Oibigny. 



Zoarium composed of bundles of long, parallel 

 zooccia free for most of their length, with the aper- 

 tures in groups at the ends of the bundles. 



Fasciculipora d'Orb. (Fig. 447). Zoarium of 

 long, simple or divided branches. 

 Tertiary. 



Gorymbopora Michelin. Like 

 but sides of branches marked by numerous jiores. 

 Cretaceous. 



Apsendesia Lamx. Zooccial bundles arise from 

 a small cup-shaped disk. Jurassic and Cretaceous. 



Discofascigera d'Orb. Cretaceous and Ter- 



Jurassic to 



Fasciculipora 



Family 7. Theonoidae Busk. 



Zoarium adnate or erect ; zooecia simple, short, open tubes with apertures confined to 

 crowded bands along raised ridges or on the edge of the fronds. 



VOL. I Y 



