200 SYNOPSIS OF THE CHARACTERS OF THE 



I have named this fine coral after Mr. Charles B. Newenham of Cork, a gentleman who has most assiduously 

 collected the fossils of that neighbourhood, and whose Collection has furnished the only examples of the species 

 which have been seen. Length of specimens, imperfect at both ends, one inch eleven lines; diameter of midrib, 

 one line. Length of lateral branches, as far as known, about five lines ; they are about one line apart. 



POLYPORA. M' Coy. 



Gen. Ch. Expanding, interstices round, branching, having on one side from three to five rows of pores, 



the maro-in of which is never raised, interstices connected by thin, transverse, nonporiferous dissepiments. 



This (fenus is very abundant in the carboniferous limestone, and as it appears to form a verynatural group 

 distinct both from Retepora and Fenestella, I have, after much hesitation, ventured to characterize it. From 

 Retepora it is easily distinguished by its nonporiferous dissepiments, and general habit; from Fenestella it is 

 well distinn-uished by the numerous rows of pores, and the absence of a keel on the interstices; the species of 

 the present genus do not appear to assume an infundibuliform or cup-shaped figure, but are usually flat and 

 fan-shaped. 



POLVPORA DENDROIDES. M'Crn/. (PI. XXIX. fig. 9)- 



Sp. Ch. — Flat, fan-shaped, interstices thick, regularly branched, divaricating ; dissepiments very thin, 

 frequently oblique, and placed at nearly equal distances ; fenestrules large, rhomboidal, poriferous face, with 

 five rows of small impressed pores arranged in quincunx, reverse longitudinally striated. 



This beautiful species is chiefly remarkable for the degree of divergence with which the interstices branch, 

 and the small number of rows of pores. Length one inch, width one and a half inches ; the interstices are 

 about one line apart and half a line thick. 



POLYPORA MARGINATA. M'CoiJ. (PI. XXIX. fig. 5). 



Sp. C/i.— Interstices thick, irregularly bifurcate; sides margined ; dissepiments thin ; fenestrules small, elon- 

 gate, oval, or approaching to a square form ; reverse with direct, deep, longitudinal strias ; poriferous surface, 

 with five alternating rows of pores, and interjacent, waved striae. 



The broad, flat, margin of the branches distinguishes this rare species at a glance from any of the other 

 corals likely to be confounded with it. 



POLYPORA PAPILLATA. M'Coy. (PL XXIX. fig. 10). 



Sp. Ch. Interstices rarely bifurcating, very narrow, rounded ; dissepiments thin, rounded; fenestrules cir- 

 cular or oval ; poriferous surface smooth, with three alternating rows of pores ; reverse smooth, with a small, 

 papillated pore at the origins of most of the dissepiments. 



This species is remarkable for its large and round fenestrules, which are of such a size that the interstices 

 and dissepiments appear disproportionably thin. The prominent pores on the outer side have caused me to 

 doubt the propriety of jjlacing this coral in the same genus with the preceding species. It is very rare. 



POLYPORA VERRUCOSA. M'Coy. (PL XXIX. fig. 6). 



Sp. Ch. — Interstices rarely bifurcating, regular, equal, rounded; dissepiments thin, distant; fenestrules rec- 

 tangular, five times as long as wide, about one-third wider than the Interstices, equal ; obverse with four rows 

 of prominent, wart-like pores, about ten In each row to the length of a fenestrule ; between the pores are waving, 

 longiiudlual strise; reverse nearly smooth. 



