or Little Knoivn, Polyzoa, 67 



aperture hollowed below ; mouth situated at the extreme 

 upper end ; a short, stout, mamilliform process on each side 

 above. Avicularium at the upper part of a special cell, the 

 mandible directed upwards, narrowed below, broad and 

 rounded above, the narrow chitinous band in its margin 

 minutely beaded or crenulated. 



Sorrento, Kev. Dr. Porter. 



At once distinguished by the membrano-calcareous lamina, 

 the mamilliform process on each side of the mouth, and 

 especially by the peculiar avicularium, the mandible of 

 which shuts down like one side of a clasp-purse. It 

 approaches the genus Biflustra. 



Family MiCROPORiDiE. 



Thairopora Jervoisii, Hinohs sp. PI. II., fig. 1. 



{Steganojporella Jervoisii, Hinchs, Ann. ISfat. Hist. 1880). 



Zoarium encrusting. Zooecia arranged in linear series, more 

 or less quadrate, separated by raised margins; each zooecium 

 traversed by raised lines, of which two usually proceed from 

 each side inwards, the lower inclined ol^liquely upwards, 

 the upper downwards, each pair meeting about the central 

 line, the points of junction being united by a vertical raised 

 line; mouth very lofty, narrow, hollowed below, on each 

 side a stout mamilliform process directed straight forwards. 



Sorrento, Eev. Dr. Porter. 



MicTopora coriacea, var. angusta. 



Micropora coriacea is a common species. As found in 

 Australia it differs little from the European form, except in 

 the general absence of the clavate elevations of the margins 

 near the mouth, which, however, are occasionally seen. One 

 variety seems worthy of being distinguished. In it the 

 zooecia are very long and narrow, the margins sharply raised 

 and finely crenulated, the pouting lower lip marked in the 

 same way, the front of the zooecium punctate or finely per- 

 forated, but without any large lateral apertures. The 

 ooecium does not present the usual knob-like elevation, and 

 the avicularium has the mandible directed obliquely down- 

 wards. The whole zoarium is silvery, and frequently only 

 loosely adnate. 



r2 



