SUB-ORDER D 



CHILOSTOMATA 



287 



Family 7. Membraniporidae. Busk. 



Zoarium calcareous or membrano-calcareous, encrusting or erect, in the latter case bifoliate, 

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

 expansion, or in linear series. Margins raised, the depressed front more or less 

 membraneous. Cretaceous to Recent. 



Membranipora, Blainv. (1 Marginaria, Roemer ; (?) Dennatopora, Hagw.), (Fig*. 477, 

 478). Zoaria encrust in-, alcareous, 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 aperture. 





Family 8. Cribrilinidae. Hincks. 



Zoaria encrusting or erect. Zooecia having the front wall more or less fissured, or 

 traversed by radiating furrows. Cretaceous to Recent. 



Membraniporella, Smitt (Fig. 479). Zoaria encrusting or rising into free foliaceous 



LM jjjj 



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FIG. 479. 



FIG. 480. 



FIG. 478. 



FIG. 477. 



Encrusting /uui'ium of Membranipora, 

 with non - calcified zooecial walls. 

 Magnified. 



Membraniporella 



Abbotti, G. and H. 



sp. Cretaceous ; 



N.J. Zocecia highly 



highly magnified (after magnified (after magnified (after 

 Uibb'an.l Horn). Gabb and Horn). Gabb and Horn). 



Membranipora plebeia, 

 G. and H. Cretaceous ; 

 N. J. Several cells 



Cribrilina Heer- 

 manni, G. and H. 

 sp. Post-Pliocene ; 

 Santa Barbara Co., 

 Cal. Zocecia highly 



expansions, sometimes consisting of superimposed layers. Zocecia closed in front by 

 a number of flattened calcareous ribs more or less consolidated 

 centrally. Cretaceous to Recent. 



Cribrilina, Gray (Fig. 480). Zoaria usually encrusting. Zooecia 

 having the front more or less occupied by radiating or transverse 

 rows of punctures, each row in a furrow ; orifice semi-circular or 

 sub-orbicular. Cretaceous to Recent. 



Family 9. Microporidae. Smitt. 



Zocecia having the front wall entirely calcareous; usually with 

 short, elevated margins, fissures, or perforations. Cretaceous to Recent. 



Micropora, Gray (Fig. 481). Zoaria encrusting. Zooecia with 

 prominent raised margins ; the front depressed, with a perforation highly 

 at each upper angle below the semi -circular or rounded orifice. Horn). 

 Cretaceous to Recent, 



Steganoporella, Smitt ; Setosella, Hincks. Recent. 



FIG. 481. 



Micropora disparilis, 

 G. and H. sp. Post- 

 Pliocene ; Santa Bar- 

 bara Co., Cal. Zouvi;i 

 magnified 

 Gabb and- 



