204 MICROPORELLID.E. 



Family XI. Microporellida. 



CELLBFOBIDA (part.), Johnston. 

 MKMHHASIPOKIII.F. (part.), Busk. 

 PoHiNiD.fi (part.), D'Orbigny. 

 KM iiAKiroiup.E (part.), Smitt. 



ZOCECIA adnate andincrusting, or forming erect and foliated 

 or dendroid zoaria ; orifice more or less semicircular, 

 with the lower 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 Lepralia 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 /urpos, small, and iropos. 



ESCIIARA (part.), Pallas. 



CELLEPORA (part.), Linn. : Audouin. 



FLCSTRA (part,), Audouin. 



BEBEMCEA (part.), Fleming. 



LEPRALIA (part ), Johnston, &c. 



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



HERENTIA (sp.), Gray. 



REPTOPORINA (part.), D'Orbigny, Pal. Fran$. Terres Cr6t. v. 441. 



PORINA, Smitt, Kritisk Forteckn. 



POHBLLINA, Smitt (not D'Orbigny), Floridan Bryoz. 



MICROPORELLA, Hincks, Ann. N. H. for Dec. 1877, 526. 



ZOARIUM incrusting. ZOCECIA with a semicircular aper- 

 ture, the lower margin entire, and a semilunate or circular 

 pore below it. 



WE do not know the physiological import of the defi- 



