204 MICKOPOKELLID^. 



Family XI, — MicroporellidaB. 



Celleporid.e (part.), Johnston. 

 Membraniporid.e (part.), Busk. 

 PoRiNiD.E (part.), D'Orbigny. 

 EscHARiPOKiD.E (part.), Smitt. 



ZocECiA aclnate andincrust'mg, or forming erect and foliated 

 or dendroid zoaria ; orifice more or less semicircular, 

 with the loiver margin entire ; a semilunate or circular 

 pore on the front wall. 



The Porinidce of D'Orbigny include two types of form, 

 which seem to be properly referable to separate groups. 

 One is well represented by hepralia ciliata auctt., and 

 the other by Porina borealis, Busk ( = Quadricellaria gra- 

 cilis, Sars). I have retained D'Orbigny's name for the 

 latter. 



Genus MICROPORELLA, Hincks. 



Der. From fiiKpo?, small, and tto^os. 



EscH.\RA (part.), Pallas. 



Cellepora (part.), Linn. : Audouin. 



Flustra (part,), Audouin. 



Berenicea (part.), Fleming. 



Lepralia (part ), Johnston, &c. 



EscHARiNA (part.), M. Edwards: Gray. 



Herentia (sp.), Gray. 



Reptoporina (part.), D'Oi-bigny, Pal. Fran9. Terres Cret. v. 441. 



Porina, Smitt, Kritisk Forteckn. 



PoRELLiNA, Smitt {not D'Orbigny), Floridan Bryoz. 



MiCROPORELLA, Hincks, Ami. N. H. for Dee. 1877, 526. 



ZoARiUM incrusting. Zocecia ivith a semicircular ai^er- 

 ttrre, the lower margin entire, and a semihinate or circular 

 pore below it. 



"We do not know the physiological import of the defi- 



