264 



MOLLUSCOIDEA BRYOZOA 



SUB-KINGDOM V 



anastomosing. Zocecial apertures on one side only ; branches otherwise without pores. 

 Cretaceous to Recent. 



Unicytis, d'Orb. Like the preceding, except that the non-elevated portions of the 

 surface of the branches are occupied by interstitial cells. Cretaceous. 



FIG. 422. 



Theonoa aurantiwn, M. Edw. Crag ; Sussex. A, Zoarium broken 

 open in a vertical plane, Vi- -B. Enlarged portion of upper surface. 



FIG. 423. 



Fasdculipora incrassata, d'Orb. Upper 

 Cretaceous ; Meudon, near Paris. Ter- 

 minal fragment, nat. size and enlarged 

 (after d'Orbigny). t . 



1 an 

 (after Ulr 



Osculipora, d'Orb. (Fig. 424). Differs from Frondipora in having the apertures in two 



alternating rows of more or less strongly project- 

 ing clusters. Cretaceous. 



Truncatula, Hagw. (Fig. 425). Distinguished 

 from Osculipora by having one face only covered 

 with epitheca, the other (convex side) exhibit- 

 ing numerous longitudinally arranged interstitial 

 cells. Cretaceous. 



Desmeopora, Lonsd. (Semicytis, d'Orb.) ; Dis- 

 cofascigera, d'Orb. Cretaceous. 



Cyrtopora, Hagw. Sub - cylindrical stems 

 with prominent clusters of four or more zooecial 

 apertures scattered over the entire surface. In- 

 terspaces smooth. Cretaceous to Recent. 



Plethopora, Hagw. Clusters larger than in the 

 preceding, and the depressed interspaces occupied 

 by small cells. Cretaceous. 



FIG. 424. 



Osculipora trun- 

 cata, Hagw. Up- 

 per Cretaceous ; 

 Maestricht, Hol- 

 land. Fragment, 

 and enlarged 



FIG. 425. 



ich). 



Truncatula repens, 

 Hagw. Upper Cretace- 

 ous ; Maestricht. Lower 

 and upper sides of 

 zoarium, enlarged (after 

 Hagenow). 



Family 7. Lichenoporidae. 



Zoaria simple or composite, discoid or massive, adhering by more or less of the under 

 surface. Zocecial apertures on the upper surface, arranged in radial series. Jura to 

 Recent. 



Discocytis, d'Orb. (Pelagia, Mich, non Lam. ; Bicavea, Radiocavea, d'Orb.), (Figs. 426, 

 427). Zoaria cup-shaped, obconical, or discoid, often pedunculate, poriferous on the under 

 and outer sides. The concave upper side with a decidedly radial structure ; zooecial 

 apertures scarcely distinguishable from pores on the sides of the zoarium. Cretaceous. 



Apsendesia, Lam. (Pelagia, Lam. ; Defrancea, Bronn ; Eadiofascigera, etc., d'Orb. ; 

 ? BusJcia, Reuss), (Figs. 428, 429). Zoaria simple or composite, discoid or lamelliform, 

 attached by a peduncle or by the whole under surface. Interstitial cells wanting. 

 Jura to Recent. 



Lichenopora, Defr. (Discocavea, Radiocavea, etc., d'Orb. ; Stellipora, Hagw. non Hall ; 



