ON IRISH PERMIAN FOSSILS. 
77 
variously distorted as to appear as if belonging to a number of species. I 
must not dispute, however, the possibility of there occurring in the locality 
named more species than one—perhaps the Schizodus obscurus of Sowerbv. 
Schizodus Schlotheimi is rather common both at Tullyconnel and Cultra. 
I am disposed to look on the Schizodus which Mr. Binney has found in the 
magnesian limestone between St. Bees’ Head and Whitehaven as belonging to 
the present species.* It is abundant in the neighbourhood of Manchester, in 
Durham, and Germany. Other two or three species of the genus occur in 
strata of the Permian period. 
8. Turbo helicinus = Trochilites helicinus , Schlotheim _PI. i., fig. 7; Mono¬ 
graph, pi. xvi., figs. 21-22. 
This and the following Gastropods are only suspected as belonging to the 
genera in which they are respectively placed. 
The present species, which rarely exceeds 3-8ths of an inch in height, has 
tumid whorls, marked with five or more rather prominent spiral ridges, crossed 
by numerous fine incremental lines. I found only two impressions in the 
Tullyconnel deposit, one of which supplied me with the gutta percha cast 
represented, thrice the natural size, under figure 7. It occurs near Man¬ 
chester; also in Durham and Germany. Turbo Mancuniensis , an allied 
species, with a more elongated spire, appears to be absent at Tullyconnel, 
although it is a common Permian fossil in the neighbourhood of Manchester 
and in Durham. 
9. Turbo Thomsonianus, King. —PI. i.; fig. 8; Monograph, pi. xvi., figs. 23 
and 24. 
This is a pretty little species, hitherto only known to me as occurring near 
Sunderland, in Durham. It is smaller than the last, being seldom more than 
a quarter of an inch in height; and differs from it in being ornamented with 
numerous fine, thread-like spiral lines. The spire is elevated, resembling, in 
this respect, the Turbo Mancuniensis. Only a single good impression occurred 
to me, from which I have taken the gutta percha cast represented, thrice the 
natural size, in figure 8. 
10. Turbo Taylorianus, King. —PI. i., fig. 9; Monograph, pi. xvi., figs. 25, 26. 
This is another small species, ornamented like the last, but differing from it in 
having a shorter spire. The figure, a little above twice the natural size, is 
from a gutta percha impression taken from one of the best specimens I found 
at Tullyconnel, where it does not appear to be rare. It also occurs in the 
magnesian limestone near Sunderland, in Durham. 
11. RlSSOA (?) Altenburgensis = Turbonilla Altenburgensis , Geinitz. —PI. i., 
fig. 10. 
12. —- (?) Gibsoni, Brown. —PI. i., fig. 11. 
In addition to the Turbos named, a few impressions of other two species of 
Gastropods occurred to me in the Tullyconnel limestone, but so small as to 
render the identifications above given somewhat doubtful. Both are smooth. 
Vide reference under Balievellia antiqua. 
