212 PERMIAN FOSSILS. 
of my specimens, of which I collected several, display the least indication of a slit in 
the outer lip. Its flattened apex, and rather large umbilicus, are characters readily 
separating it from any of the Gasteropods next to be described. 
It is rather common in Shell-limestone at Tunstall Hill. 
Family Natici1p#&, Forbes, 1838. 
The animal of this family is “‘ peculiar for having a large foot, in which the hemi- 
spherical shell is imbedded, and which is much produced in front, beyond its edge: 
the tentacles are small, sometimes obliterated, and the mouth is hid in a groove: the 
operculum is spiral.’” 
Genus WVatica, Adanson, 1757. 
Diagnosis.—“ Shell generally thick, strong, smooth, and glossy, occasionally covered 
with fine strize, of an ovate, globulous, or subspheroidal form, with a short or slightly 
elevated spire; aperture oval, or semilunate; outer lip plain and simple; inner 
lip sometimes depositing a callosity, the callus modifying the form and size of the 
umbilicus.” (Searles Wood.’) 
NATICA MINIMA,- Brown. Plate XVI, fig. 29. 
Natica MINIMA, Brown. Trans. Manch. Geol. Soc., vol.i, p. 64, pl. vi, figs. 22-24, 1841. 
— — » Morris, Catalogue, p. 153, 1843. 
= = Me De Verneutl, Bull. Soc. Geol. de France, 2™ série, vol. i, p. 34, 
1844. 
— — “ Geol. Russ., vol. i, p. 225, 1845. 
= — a Tennant, Strat. List, p. 89, 1847. 
Diagnosis.—“ Shell ovate ; body large; spire small, consisting of two depressed 
volutions ; aperture semilunar.” (Brown.’) li 
This very minute species, the typical specimen (a rather impeniece cast) of which 
does not exceed one sixteenth of an inch in height, was found by Mr. KE. W. Binney in 
the Permian Marls near Manchester. 
Natica LEIBNITZIANA, King. Plate XVI, figs. 27, 28. 
Natica Lerpnitzrana, King. Catalogue, p. 13, 1848. 
LitToRINA MINIMA (Navica 1p.), Brown. Howse, Trans. T. N. F. C., vol.i, p. 240, 1848. 
Natica Hercynica, Geinitz. Versteinerungen, p. 7, pl. ii, figs. 11-13, 1848. 
Diagnosis—As wide as it is high: rather thick: marked with zig-zag coloured 
bands in the direction of the incremental laminze, which are oblique to the axis of the 
1 Gray, Synopsis of the British Museum, p. 91, 1841. 
2 Monograph of the Crag Mollusca, part i, p. 140. 
° Trans. Manchester Geol. Soc., vol. i, p. 64, 1841. 
