CARBONIFEROUS FOSSILS OF IRELAND. 199 



Glauconome BIPINNATA. Pltil. 

 Glauconome bipinnata. Phil. Pal. Fos. 

 Sp. Ch. — Bipiimatc, secondary branches very short; obverse with two rows of approximate, oval pores; 

 reverse witli strono- m-anuhTtcJ stria?. 



This species is nearly allied to the G. j'liona, but differs in its bipinnate mode of branching, and in having 

 the secondai-y branches niucli shorter, and as if truncated ; the pores also differ. 



Glauconome GRACILIS. M'Coy. (PL XXVIII. fig. 5). 



Sp. Ch. — Very slender, elongate, simply pinnate; lateral branches opposite, short, slender; obverse of the 

 stem strongly carinated ; with, on each side, a row of very large, circular, piomincnt pores, which strongly indent 

 the margin ; one is placed at the origin of each lateral branch, and one in the intermediate space, about half 

 their own diameter apart; lateral branches without keel; pores large, round, very prominent, and indenting the 

 margin, arranged alternately in inosculating lines ; reverse, convex, with about four strong, granulated, longitu- 

 dinal ridges. 



This elegant species is very common in some localities. It is distinguished from the G.pluma, Phil., G. 

 disticha, Goldf , and G> bipinnata, Phil., by the large, circvdar, prominent pores of the stem ; it is much 

 smaller, or rather more slender than those sj^ecies, in which also the margin is entire. The specimens are usu- 

 ally about one inch in length ; stem about one-fifth of a line in diameter. 



Glauconome 6RANDIS. M'Coy. (PL XXVIII. fig. 3). 



Sp. Ch. — Stem less than twice the thickness of the lateral branches; lateral branches rather more than the 

 width of the midrib apart, obscure ; lateral branches carinate, and bearing two alternating rows of very small, 

 round, prominent pores, which indent the margin slightly ; the stem is obscurely carinate, and has usually two 

 rows of small, round, prominent pores, which do not alternate, or reach the margin ; one at the origin of each 

 lateral branch, and three between one branch and the next. 



The small size, and great number of the pores distinguish this from every other species of Glauconome I 

 know. It is a very large species. Length of imperfect specimen one inch nine lines ; length of lateral branches 

 two lines ; diameter of midrib about half a line. Collected by Mr. Charles B. Newenham of Cork, who kindly 

 presented the specimen figured. 



Glauconome plum a. PJiil. sp. 



Retepora pluma. Phil. Geol. York. 



Sp. Ch. — Branches alternating at very regular distances ; on the midrib two rows of very large, ovate 

 pores, sul^alternate with prominent margins ; pores on the branches small, round, regularly alternating ; reverse 

 longitudinally striated. 



This little species has the pores on the midrib so large as to occupy the entire of the poriferous surface ; 

 the branches are numerous; close, and regularly alternate. Length about one and a half inches, diameter of 

 midrib one-third of a hne. 



■ Glauconome pulcherrima. M'Coy. (PL XXVIII. fig. 4). 



Sp. Ch. — Stem bipinnately branched, main stem and principal branches strongly keeled, branchlets both of 

 the main stem and branches regularly attenuate, without keel ; pores large, with prominent margins, one row- 

 on each side of the principal stem and branches, and one very minute row on the keel ; pores on the branchlets 

 as large as those of the branches, but ai)proximate, almost inosculating, tliere being no keel to separate the two 

 rows ; reverse finely striated longitudinally. 



