206 PERMIAN FOSSILS. 
volutions separated by a channelled suture; body provided with many prominent, 
spiral ribs ; three on the body above, with five or six concentric ones beneath, and two 
on each of the volutions of the spire; these are crossed by numerous longitudinal 
wrinkles; aperture large, orbicular ; outer lip expanded, smooth; pillar lip with an 
oblong umbilicus behind it. Length upwards of a quarter of an inch; body nearly the 
same in diameter.” (Brown.’) 
A small species, possessing some resemblance to the last, but differing from it in 
having the spire more acuminated, the whorls less tumid, and the spiral ridges generally 
stronger and more numerous ; the ridges range from six to nine in number. It appears 
to have been ornamented with longitudinal coloured bands parallel to the incremental 
laminz, which are rather prominent. 
Young specimens are somewhat umbilicated. My largest specimen is five six- 
teenths of an inch in height, and four sixteenths in width. 
Turbo Mancuniensis occurs in the Shell-limestone at Tunstall Hill; in the Breccia 
at the north end of Black Hall rocks; and in the Permian Marls at Newtown near 
Manchester, though considerably smaller in this locality than in the two former. 
Probably it occurs in the pisolitic Yellow Limestone between Marr and Hickleton.’ 
TurBo PerMIANUS, King. Plate XVI, fig. 16. 
TurBo Permianus, King. Catalogue, p. 13, 1848. 
Diagnosis. —-“ Spires four, smooth, length under a quarter of an inch.”* Ayerture 
orbicular: zzner lip slightly reflected. 
A species, generally agreeing with the above description, but occasionally exhibiting 
several faint spiral striz, has occurred to me in various localities. My largest 
specimen is four sixteenths of an inch in height, and three sixteenths in width. 
Professor Phillips cites Hawthorn Hive as a locality for this small species: it 
occurred to me at Silksworth, Byers’s Quarry, Humbleton, Tunstall Hill, and Hylton 
North Farm. Fossils probably identical with it are rarely found in the Blue Lime- 
stone of Polterton and Bolsover; and in the lower beds of Yellow Limestone near 
Conisborough. (Sedgwick.) 
Turso THOMSONIANUS,! King. Plate XVI, figs. 23, 24. 
Turso THomsonianus, King. Catalogue, p. 13, 1848. 
Lirrortna TUNSTALLENSIS, Howse. Trans. T. N. F. C., vol. i, p. 240, 1848. 
1 Transactions of the Manchester Geological Society, vol. i, p. 29. 
Vide Sedgwick, Trans. Geol. Soc. Lond., 2d series, vol. ui, p. 118. 
3 Phillips, Trans. Geol. Soc. London, 2d series, vol. ii, p. 118. 
4 Named after the late Dr. Thomas Thomson, F.R.S., author of ‘A Geognostical Sketch of the Counties 
of Northumberland, Durham, and part of Cumberland,’’ in the Annals of Philosophy, vol. iv, 1814. 
bo 
