ON IRISH PERMIAN FOSSILS. 
73 
enabled me to examine some examples in a more perfect condition 
than any of my own. The Museum specimens do not represent so 
many species as occurred to me; I have, however, added to the col¬ 
lection all the desiderated forms belonging to myself. 
I now purpose noticing the Tullyconnel fossils; but I have in 
the first place to express my obligations to the Council of the So¬ 
ciety for enabling me to give representations of all the species—a 
kindness which has necessarily caused an outlay exceeding the sum 
usually allowed in such cases. 
1. Spirillina pusilla* = Serpula pusilla, Geinitz.— PI. i., fig. 12 a, b; Mono¬ 
graph, pi. vi., figs. 7-9, and pi. xviii., fig. 13 a, b, c, d.f 
This singular fossil has lately been ascertained by Mr. T. Rupert Jones to 
be a species of Spirillina,—a genus of the Agathistegian group of Rhizopoda. 
He purposes describing it more fully on some other occasion. All the speci¬ 
mens that have occurred to him are casts, which consist of an oblong coil of 
subcylindrical wire-like folds. A central irregularly twisted mass, of about 
-jL inch in diameter, is inclosed in eight or more outer folds, which are flat or 
slightly concave on their internal surface, and convex externally; they are 
arranged longitudinally, not all on the same plane, but, with the exception of 
the outermost folds, cross each other at the extremities of the coil at nearly 
right angles. The size of the folds gradually increases from within outwards, 
but it is subject to irregularities, and frequently the folds are contracted where 
they bend over the ends of the coil. The species, probably, was free and un¬ 
attached. 
A very pretty specimen was found in the Tullyconnel limestone, having 
one or two more folds than any of those figured in my Monograph, and with 
the outer folds more regularly arranged on one plane. 
It is of frequent occurrence in the Magnesian limestone of Humbleton Hill, 
near Sunderland. Geinitz found it in the Zechstein of Corbusen, in Germany; 
and M. Robert Eisel, Jun., informs me, that it occurs at Gera, in the Grauer 
Mergel-zechstein, which there overlies the great fossiliferous Zechstein. 
2. Favosites Mackrothii, Geinitz .—PI. i., fig. 10, a, b; Monograph, pi. iii., 
figs. 3-6. 
This is a small branching coral, the branches consisting of numerous slender, 
l’ound, or polygonal transversely wrinkled tubes, rising perpendicularly in the 
centre, and afterwards suddenly curving out to the surface. 
The specimens of this fossil occurring at Tullyconnel, where it appears to be 
* I am indebted to my friend Mr. T. Rupert Jones for an account of this fossil 
and the Cythere inornata. He has also kindly supplied me with the figures repre¬ 
senting them. 
f This reference is to my “ Monograph of the Permian Fossils of England,” 
1850, published by the Palseontographical Society. 
