BRITISH ZOOPHYTES. 253 



circular, ivith the lower margin entire ; a semilunate or 

 circular i)ore on the front wall. — T. H. 



Genus I. Microporella, Hincks. {fitKpo<;, small, and 



TTOpO?.) 



Zoarium incrusting. Zooecia with a semicircular 

 aperture, the lower margin entire, and a semilunate or 

 circular pore below it. — T. H. 



1. M. ciLiATA, Pallas. Plate XX. fig. 7. 

 Eschara ciliata /3 {Pall.), Cellepora ciliata {Linn., 



Fahr., Bosc, Lamx.), Eschara vulgaris /3 {Moll.), Le- 

 pralia ciliata {G. J., D.L., B. Q. C, Busk), L. insignis 

 {Hassall), L. personata {Bush), L. lunata {Macgillivray) , 

 L. utriculus {Manzoni), Flustra Genisii (^itc?., Savigny), 

 Escharina vulgaris (part) {M. Edw.), Eeptoporellina 

 subvulgaris {D'Orh.), Cellepora crenilabris {Reuss), 

 C. pleuropora {Reuss), Porina ciliata {Smitt), Porellina 

 ciliata {Smitt). 



Hab. : Generally distributed, on sea weeds, shells, 

 and stones. Mr. Couch calls this the " branched celle- 

 pora." It assumes a variety of forms. The cells are 

 ovate, and frosted, the aperture is arched with a straight 

 lower margin and is armed with five to seven spines. 

 This, along with the other species of this genus, is dis- 

 tinguished by what is called a median pore or opening 

 in the front wall of each cell probably having respiratory 

 functions. In the present species the median pore is 

 often borne on a mucro or knob. The avicularia are 

 large and often curiously modified in structure ; four 

 distinct types of avicularia being recognized by Mr. 

 Hincks (A. M. N. H., ix. 25). 



2. M. M-AUisu, Audouin. 



Cellepora Malusii {Aud., Savigny), Cellepora Macry 



