﻿572 ME. A. WILMORE ON THE CARBONIFEROUS [Nov. I9IO, 



elsewhere. It is, as already pointed out, exceedingly common in 

 the Kylstone high-level beds. The horizon is probably D 3 or P. 



Zaphrentis, sp. nov. (PL XXXVIII, figs. 10 & 11.) 



I have only two specimens of this coral in the material which I 

 have had cut. The transverse section shows the following dis- 

 tinctive features : — Four well-developed fossilise. The cardinal 

 fossula (if I have orientated the coral correctly) is long, bounded 

 by two parallel septa. There is a short cardinal septum and a long 

 thickened counter septum. The major septa in the cardinal quad- 

 rants join together before reaching the middle of the coral. The 

 minor septa are well developed. The tabular intersections are 

 nearly circular. I have found this ' species ' at Bylstone and at 

 Crag Laithe. 

 r ^ i < ' . 

 Zaphrentis omalitisi, M.-E. & II. 1 



The two ' varieties ' recognized by Mr. Carruthers, as well as the 

 normal ' species,' are common in various parts of Craven. The 

 characters of these varieties are so distinct, that I suggest that they 

 may well be regarded as ' species.' Of course, there are transitional 

 forms, but such is the case with many recognized species of corals. 



Zaphrentis ambigua, E. G. Carruthers. 



This occurs at Crag Laithe, at Rylstone, and at Otterburn, as well 

 as in the Clitheroe area. For a description of this interesting species 

 or variety, see Geol. Mag. dec. 5, vol. v (1908) p. 28. Z. ambigua 

 seems to be almost confined to dark shales in which there is a 

 large amount of pyrite, both in the rock itself and in the fossils. 

 Yery often the visceral cavity of the coral contains good cubic 

 crystals of the mineral. This species is often found fossilized, 

 partly in pyrite, partly in calcite. 



Zaphrentis densa, R. G. Carruthers. 



This is not at all common in the district under consideration, 

 but in the Thornton-Broughton District it is very common. It 

 seldom or never occurs in the pyritous shale mentioned under 

 Z. ambigua, and is always, so far as I have seen it, fossilized in 

 calcite. 



Densiphyllum bradbournense, Yaughan in litt. 



This is again very common. It seems to be identical with a 

 coral described by Dr. Yaughan in the Loughshinney paper. 2 



The exterior of the coral is smooth, with few or no constrictions 

 of growth. It has a sharply curved part followed by a cylindrical 

 part of almost uniform thickness. The calyx is rarely well seen in 

 my specimens. 



1 See E. G. Carruthers, Geol. Mag. dec. 5, vol. v (1908) p. 25. 



2 Quart, Journ. Geol. Soc. vol. lxiv (1908) p. 459 & pi. xlix, fig. 2. 



