ORDER II 



CYCLOSTOMATA 



325 



Gryptoglena Marsson. Zoariuin adnate, thick and unilaminar. Cretaceous. 



Ditaxia Hagvv. {Polytaxia Hamm). Zoarium erect, lamellar and frondose. 

 Cretaceous and Tertiary. 



Reticulipora d'Orb. {Retelea d'Orb,). Zoarium reticulated ; branches greatly 

 compressed laterally. Cretaceous to Recent. 



BeptomiUticlausa, Multiclausa d'Orb. Cretaceous. 



Terehellaria Lamx. Jurassic. Zonopora d'Orl). {Spiroclausa d'Orb.). Cretaceous. 



Suborder D. CERIOPORINA Hagenow (emend.). 



Von Hagenow in 1851 maintained the Cerioporina for Ceriopora and allied genera but 



included a few other Cyclostomata. Hamm in 1881 recognised the same name, limiting the 

 group, hovvever, to the families Cerioporidae and Radioporidae. 

 The name is thns available for the post-Paleozoic Bryozoa 



agreeing with the Trepostomata in having well - developed >JW3;.*^«.\a^^»f *J'i^*"r--"'1i 



imniature and niatiire regions but differing in the amalgamated, *' "* * ' * * *•-*■-* 

 minutely porous structure of their walls. 



Family 14. Radioporidae Gregory. 



Zoaria simple or composite, discoid or massive, adhering 

 hy more or less of the under surface. Zooecial apertures on 

 the Upper surface, arranged in radial series separated hy 

 mesopores. 



Discocavea d'Orb. (Fig. 456). Zoarium of simple 

 discoid groups, witli apertures in radial uniserial lines. 

 Cretaceous to Recent. 



Lichenopora Defrance (Figs. 457, 458) {Tecticavea and 

 Badiocavea d'Orb.). Like Discocavea but apertures ar- 

 ranged in elliptical groups. Jurassic to Recent. 



Fio. 456. 



Discocavea pocillum d'Orb. Cre- 

 taceous ; France (after d'Orbigny). 



Fio. 457. 



Lichenopora (?) tubulifera (Roemer). 

 Oligocene ; Astrupp, Westphalia. 

 A, Zoarium, Vi- J^^ Cluster of 

 zoa'cial ai)ertures, enlarged. 



Lichenopora stdlata (Goldf.). Pläner; Plauen, Saxony. A, 

 Zoarium, Vi- ß> Same, enlarged. C, Vertical section of specimen 

 from Greensand of Essen, 



Stellocavea d'Orb. {Garinifer Hamm). Zoaria discoidal, the upper surface 

 exhibiting tlie salient edges of uumerous radially arranged plates, few of them 



