ON IRISH PERMIAN FOSSILS. 
81 
geologically high above the coal-measures as to render, in many 
cases, the sinking of a colliery shaft through it a ruinous speculation. 
Should, however, the so-called “ New Red Sandstone” turn out to 
be the Rothe-todte-liegende, or Lower New Red, as I suspect will 
be the case with that in the south of Tyrone and the adjacent part 
of Armagh, no expense ought to be spared in boring through it, 
with the view of reaching workable beds of coal, similar to those of 
Coal Island, at no great depth below the surface; and there ought 
to be no delay whatever in ascertaining their existence below the 
Permian limestone of Tullyconnel. 
DESCRIPTION OF PLATE I. 
Fig. 1 a. 
- d. 
5 a. 
-b. 
7. 
8 . 
9. 
10 . 
11 . 
Favosites Mackrothii. Natural size. 
Another specimen, magnified. 
Thamniscus dubius. Twice the natural size. 
Mytilus squamosus. Twice the natural size. Cast showing impressions 
of the pallial line, and the posterior adductor muscle. 
Another specimen, a cast. Twice the natural size. 
Bakevellia antiqua. Natural size. Cast. 
Another specimen. Cast, enlarged, showing impressions of the teeth, car¬ 
tilage pits, and adductor muscles. 
Another specimen. Twice the natural size, showing impressions of the 
pallial line, adductor and other muscles. 
Another specimen. Natural size. 
Fleurophorus costatus. Cast, somewhat enlarged, showing impressions of 
the posterior tooth, the anterior adductor muscle, and the ridge behind 
the latter. 
Another specimen. Impression of, twice the natural size, showing the ribs 
emanating from the nmbone. 
Schizodus Schlotheimi. Casts, natural size. This is one of the specimens 
collected by the assistants under Col. Portlock. 
Turbo helicinus. Thrice the natural size. 
- Thomsonianus. Thrice the natural size. 
-- Taylorianus. A little above twice the natural size. 
Rissoa (?) Altenburqensis. ) m, . . 
v y * > Ihnce the natural size. 
- (?) Gibsoni. ) 
SpiriUin a. pus'dla. | x ^ 12 diameters . 
13 a. 
_ b. 
Cythere (?) inornata. 
x about 8 diameters. The specimen under figure a 
has a corner broken off. 
All the specimens represented in the plate, with the exception of the Spi- 
rillina and Cythere, are placed in the palaeontological collection of the Museum 
of Irish Industry, mounted and named. 
