286 



THE CARBONIFEROUS SYSTEM. 



to be strongly and irregularly annulated. The greatest diameter ob- 

 served is seven lines, but it is probable that the average is about six 

 lines. In a transverse polished section, six lines across, the inner area 

 is three lines in diameter, and shows twenty-four septa, which do not 

 penetrate more than half a line. The columella is obscurely indicated 

 in the centre. The external area is one and a half lines in width, with 

 the inner side of the epitheca crenulated by about forty-eight septa, one 

 half of which can be indistinctly traced across to the inner wall. In 

 the longitudinal section the external area exhibits a tissue of imbri- 

 cating meniscoid cells, inclining upwards and outwards, their upper 

 sides convex, lower sides with one or two concavities, due to the con- 

 vexity of the cells below them. The average size of these cells is 

 one line in length by half that in width ; there are many smaller and 

 larger ones. In the inner area the transverse diaphragms or tabula? 

 are thin and crowded, apparently four or five, on an average, in one line; 

 they seem to be much elevated in the centre, and also sometimes 

 turned upwards at their junction with the inner wall. The axis is 

 indistinctly indicated. 



" The only species with which this need be compared is L. affine 

 (Fleming), of the Carboniferous limestone of England and Ireland. 

 According to the description and figures of Edwards and Haime, that 

 species has the corallites about five or six lines in diameter, and grouped 

 together as they are in this ; but they are not annulated exteriorly, 

 except by small wrinkles; the inner wall is not so distinctly defined; 

 the inner area narrower, and the columella more compact and per- 

 fectly developed. It has also thirty or thirty-two principal septa, 

 while in this there are only about twenty-four. 



" The two specimens on which the above description is founded are 

 imbedded in compact limestone, and although in the polished sections 

 their internal characters are well defined, yet in a large collection 

 individuals might be found to connect it to L. affine. It is a closely 

 allied species, but I think distinct." 



Zaphrentis Minas, n. sp. (Fig 84, a), collected by Professor How 

 at Kennetcook. — Corallum conical, slightly curved. Calice circular, 

 thin-edged, rather shallow ; septal fossula narrow, extending from the 

 centre to the concave side. Principal septa about thirty-two. Tabula? 

 irregular. Epitheca thin, marked externally with longitudinal stria? 

 and coarse scaly ridges, especially near the upper part. My longest 

 specimen is two inches in length, and has probably lost an inch of 

 the lower part. It is one inch in diameter. The same species occurs 

 at Cockmegun River and Stewiacke ; and small specimens, possibly 



