CARBONIFEROUS FOSSILS OF IRELAND. 195 



This species closely resembles in form our recent Flustrn foliacca, the substance of the fossil species is, 

 however, thicker than in any of the recent foliaceous Flustrce with which I am acquainted. If this be a true 

 Flustrn it belongs to that division of the genus having the cells on both sides ; it is, however, very possibly a 

 Favositc ; the whole surface is beautifully reticulated with minute cells. Length of some branches two inches, 

 thickness of the lobe about one line. 



Berenicea. Lamouroux. 

 Gen. Ch. — Parasitic ; cells united in a spot-like crust, radiating from a centre, adhering throughout, not cir- 

 cumscribed ; mouth at the distal extremity of each cell ; substance submembranaceous. 



Berenicea megastoma. M'Coy. (PI. XXVI. fig. 13). 



&p. Ch. — Mouth of the cells very large, prominent, semicircular, inclining from the centre. 



The general form of this little coral is that of a small, nearly circular, flat scale ; the openings of the cells 

 are unusually large, and having a raised edge only to the superior half of the margin, their form appears 

 nearly semicircular. 



Orbiculites antiquus. M'Coy. (PL XXVI. fig. 16). 



Sp. Ch. — Circular, flat; openings of the cells numerous, oval, nearly in quincunx order, their own diame- 

 ter apart. Diameter of disc one-third of a line. 



This very remarkable little coral occurs in abundance in the shales of some localities, but from its small size 

 it is very likely to be overlooked ; the intercellular spaces are flat and smooth. 



MiLLEPORA. 

 Gen. Ch. — Polymorphous; pores very minute, perpendicular to the surface; cells without lamella. 



MiLLEPORA GRACILIS. Phil. 



Millepora gracilis. Phil. Pal. Fos. 



Sp. Ch. — Slender, cylindrical ; cells rhomboidal, in quincunx ; interstices granular. 



This very common species is known from the M. rhomlnfera by its coarsely granular interstices ; the M. in- 

 terposa, Phil., is distinguished by its single row of impressed pores between the cells. Length usually one inch, 

 diameter three-fourths of a line. 



MiLLEPORA INTERPOROSA. Phil. 



Millepora interporosa. Phil. Geol. York. 



Sp. Ch. — Slender, cylindiical, dichtomous; cells oval, interstices broad, smooth, with a row of minute, im- 

 pressed pores. 



This is the rarest species of the genus, and also the most beautiful ; the rows of pores in the interstices are 

 variable, both in number and position, in the different specimens ; the cells are smaller and more oval than in the 

 M. rhombifera or M. cjraciUs. Length usually from one to two inches, diameter three-fourths of a line. 



MiLLEPORA (Pustulopora) ocdlata. Phil. 



MQlepora oculata. Phil, Geol. York. 



Sp. Ch. — Compressed, dichotomous, branches at right angles to the stem; four rows of very large, promi- 

 nent pores. 



The great size of the cells, with their entire oval, prominent margins, distinguish this species from all except 

 the M. spicularis, Phil., while in its rectangular manner of branching it differs from all the other Palteozoic 

 species. 



