ORDER II 



CYCLOSTOMATA 



323 



Truncatula Hagw. (Fig. 453). Like Osculipora, biit convex sides exliibiting 

 iiuiuerons pores longitudinally arranged. Cretaceous. 



Homoeosolen Loiisdale {Supercytis, Unicytis d'Orb.). Cretaceous. 



Discocytis d'Orb. (Pelagia Mich., non Lam.) (Fig. 454). Zoarium cupuliform ; 



Fig. 454. 



Discocytis eucksü d'Orb. Upper Cretaceous'; France. Zoarium, 3/^, and three views of 

 same enlarged (after d'Orbigny). 



iil)per surface concave with radiating ridges having apertures at their outer ends ; 

 ander surface poriferous. Cretaceous. 



Gytis, Badiofascigera, Bicavea d'Orb. Cretaceous. 



Family 9. Oeidae d'Orbigny 



Zoaria ramose, bifoliate or uni-lamellate. Zocecia tubulär, sub-equal, their walls 

 at first, hut thickening gradually toward the periphery, where the cavity suddenly 

 dilates in such manner that the rounded or elliptical aperture lies at the hottom of an 

 hexagonal depression. Interstitial cells wanting. Cretaceous. 



The systematic position of this family is highly problematical. It appears to have certain 

 affinities with the Trepostomata, but its removal to that vicinity is hardly feasible until a 

 thorough comparison of Paleozoic and Mesozoic Bryozoans shall have been made. 



Semicea d'Orb. (Reptocea d'Orb. p.p.) ; Discocea Pergens. 



Fig. 455. 



Filiceavelata(E.agw.). Upper Cretaceous; Maestri cht, Holland. ^, Branch, Vi« -B, Surface 



of sanie enlarged. C, Vertical section (after d'Orbigny). 



Gea d'Orl). Zoaria forming flattened branches or broad lamellae, celhiliferous on 

 both sides. 



Filicea d'Orb. {Laterocea d'Orb.) (Fig. 455). Zoaria erect, with sub-cylindrical 

 branches bearing apertures on all sides. 



