CARBONIFEROUS FOSSILS OF IRELAND. 203 



This species is somewhat cup-shaped ; very mucli expanded, with the root excentric ; usually one-fifth of 

 the diameter from one of the sides ; the dissepiments are unusually delicate, and have frequently disappeared, 

 while the other parts of the coral are in good preservation. I have named this species in honour of my friend, 

 Mr. J. Morris, the author of the elaborate and highly useful Catalogue of British Fossils. 



Fenestella multipoeata. M'Coy. (PI. XXVIIL fig. 9-) 



Sp. Ch. — Foliaceous; interstices thin; sharply keeled, irregularly branched ; dissepiments thin, distant, 

 fenestrules large, very elongate, irregular ; pores very numerous, small, margins tumid, seven or eight to the 

 length of a fcnestrule ; reverse regularly striated. 



The great number of pores between each dissepiment is the most remarkable peculiarity of this species. It 

 grows frequently to a length of two or three inches; there are about three interstices in one line. 



Fenestella nodulosa. Phil. sp. 



Retepora nodulosa. Phil. Geol. York. 



S}}. C/*.— Flat, expanded, fan-shaped; interstices thick; dissepiments equidistant, regular, half as thick as 

 the interstices ; fenestrules quadrate, rounded at the extremities, constricted in the middle, length and breadth 

 nearly equal ; pores large, with very prominent margins, more than their own diameter apart, one at the origin 

 of each dissepiment, and one in the middle, deeply indenting the margin. 



This interesting coral is very closely allied to the F. plebeia, M'Coy, but is easily distinguished by the 

 single, very prominent, mesial pores, constricting the sides of each fenestrule, giving them somewhat of an 

 hour-glass form. 



• Fenestella oculata. ilfCoj/. (PL XXVIIL fig. 15). 



Sp. Ch. — Interstices very broad, flattened, rarely branched, obscurely keeled; dissepiments less than one- 

 fourth the thickness of the interstices, regularly placed ; fenestrules half the width of the interstices, rectangular, 

 three times as long as wide ; pores placed close to the margin, very large, with a thickened margin, which 

 deeply indents the sides of the fenestrule, three between each dissepiment; reverse smooth. 



This species is remarkable for the great proportional size of the interstices, and tlie size and prominence 

 of the pores; the keel on the interstice is nearly obsolete. Occurs usually in fragments, about one inch in 

 length : there are about two interstices in one line. 



Fenestella plebeia. M'Coy. (PI. XXIX. fig. 3). 



Sp. Ch. — Flat, expanded, fan-shaped; interstices thick; fenestrules equal, rectangular, from two to tliiee 

 times as long as wide ; width equal to that of the interstices ; dissepiments thin, regular ; pores four or five to the 

 length of a fenestnde; reverse minutely granulated, and very coarsely sulcated longitudinally. 



This is a very abundant species. 



Fenestella polypoeata. Phil. sp. 



Eetepora polyporata. Phil. Geol. York. 



Sp. Ch. — Interstices thick, rounded (not carinated ?), irregularly branched; dissepiments short, thin, placed 

 at irregular distances ; fenestrules large, very irregular in size and shape ; pores very small, impressed, from five 

 to seven to the length of a fenestrule. 



This is a very interesting species, as exhibiting one of those aberrant types of form so important to the sys- 



