OUDEll II 



CYCLOSTOMATA 



323 



Trancatula Hagw. (Fig. 453). Like Osculipora, l)ut convex sides exliiljitiiig 

 luniierous pores longitudinally arranged. Cretaceous. 



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



Discocytis d'Orb. (Pelagia Mich., non Lam.) (Fig. 454). Zoariuni cnpuliform ; 





tf' ' ' VAyy*Mi'^i,i ■"■■■ ■"'^ 



Pig, 454. 



Discocytis euiiesii d'Oii). Upper Cretaceous'; France. Zo.iiium, 3/^, and three views of 

 same enlarj^ed (after d'Oibigny). 



u|i])er surface concave with radiating ridges having apertures at their outer ends ; 

 under surfixce poriferous. Cretaceous. 



Gytis, Badiofascigera, Bicavea d'Orb. Cretaceous. 



Family 9. Oeidae d'Orbigny 



Zoaria ramose, bifoliate or uni-lamellate. Zocecia tubular, sub-equal, their ivalls 

 thin at first, but thickening gradually toward the periphery, cohere the cavity suddenly 

 dilates in such manner that the rounded or ellipticg,l aperture lies at the bottom 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. {Reftocea d'Orb. p.p.) ; Discocea Pergens. 



B 



Fig. 455. 



Filicea velata (Hagw.). Upper Cretaceous ; Maestricht, Holland. ^4, Branch, i/i- jB, Surface 

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



Cea d'Orb. Zoaria forming flattened l)ranclies or broad lamellae, celluliferous on 

 both sides. 



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

 branches bearing apertures on all sides. 



