ORDER V 



CHEILOSTOMATA 



349 



tlie 



segments 



sub-cylindrical and connected by flexible, horny tuljes. Zooecia 

 immersed, snrronnded l)y a raised V)order, disposed in quincunx. 



Fio. 50! I. 



' 'dhdii rid rlmmhifciu 

 (Goldfnss). Oligoceiie ; 

 Kaufungen, near Cassel. 

 Enlarged (after Reuss). 



Avicularia irregu- 

 larly distributed, 

 situated above a cell. 



or occupying 

 place of one. 



tin 



Fio. 510. 



Encrusting zoarium of Membniniponi, witli 

 non-calcified /.(xecial walls. Magnified. 



Family 5. Membraniporidae Busk. 



Fig. 511. 



Mem hm n vponi plcheia 

 (G. and H.). Cretaceous; 

 N. J. Several cells highly 

 magnified (after Gabb and 

 Horn). 



Zoarium calcareous or memhrano-calcareous, encrasfing or erect, in the latter case 

 bifoliate, or sub-cylindrical. Zooecia placed side by side, and forming an irregular 

 continuous expaiision, or in linear series. Margins raised, the depressed front more or 

 less membranous. 



Membranipora Blainv. (? Marginaria Eoenier ; (?) Dermatopora Hagw.) (Figs. 

 510-511). Zoaria encrusting, calcareous or sub-calcareous. Zooecia arranged 

 irregularly or in rows, without a calcareous lamina on the front, or only partially 

 covered by one, leaving a variously shaped apertuie. Jurassic to Eecent. 



Tremopora Ortmann. Like Membranipora, but has a large avicularium and 

 bifurcated spine on the border. Tertiary to Recent. 



Hagenowinella Canu. Cretaceous. 



Family 6. Selenariidae Busk. 



Zoaria circular or irregular in outline, the celluliferous side convex, the lower concave 

 or Jlat, irrobably free in the mature condition. Upper surface areolated, the zooicia 



Pig. 512. 



LunuUtcx ijohlfusii Hagw. Upper Cretaceous ; Luneburg. a-c, Zoarium of the natural size. 

 d, Upper surface, enlarged, c, Lower surface, enlarged. 



