Class GASTEROPODA.
Genus Littorina, Férussac.
Littorina scoto-burdigalensis, sp. nov. Pl. II. figs. 26, 27.
Sp. char. Shell conic-oval, imperforate; spire obtusely pointed; whorls four, flattened or shoulder-like immediately below the suture in each whorl, especially the last one; suture distinctly marked, the last whorl twice as large as the other three. Peristome entire; aperture oval, rounded below. Outer lip . . . . ?; inner lip reflected over the spire. Surface of the shell without ornamentation.
Obs. The above description is drawn up from specimens kindly lent by Mr. Gall, through Mr. Henderson. After much consideration, both on my own part and that of my friend Dr. J. C. Purvis, I have provisionally placed this troublesome little shell in the genus Littorina. All the specimens I have seen separated from the matrix are, at the best, but imperfectly preserved; but, so far as can be made out, it appears to be a member of the Littorinidæ, and has also perhaps some characters in common with the Paludinidæ. Previous to seeing Mr. Gall's specimens, I had named those in the Survey Collection, in MS., as above, from the fact that the species is the chief component of a thin shelly band at the base of the Burdiehouse Limestone at the Raw Camps Quarries, near Mid Calder. The band in question is locally called "Buckie-fake," and appears to contain little else than this small Gasteropod. The Burdiehouse Limestone is usually considered to be of freshwater, or at the least estuarine origin. Should this species be proved to have more affinity with Paludina than with Littorina, it will tend to support this hypothesis; still, even if referred to Littorina, it will not detract much from the fresh- or brackish-water origin of the Burdiehouse Limestone.
Loc. and Horizon. Drumshough, near Dean Bridge, Edinburgh.
Genus Pleurotomaria, Defrance, 1824.
Pleurotomaria monilifera, Phillips ?. Pl. II. fig. 28.
Pleurotomaria monilifera, Phill. (1836), Geol. Yorksh. ii. p. 227, t, 15. fig. 10 a; De Koninck (1842–45), Anim. Foss. Terr. Carb. Belg. p. 387, t. 34. fig. 2; Brown (1849), Foss. Conch. p. 87, t. 40. figs. 30, 34.
Obs. All the specimens are crushed; but there appear to be traces of the shallow groove of the body-whorl, with its tuberculated bordering keels, characteristic of the species, as described by Prof. De Koninck. There are also indications of spiral and transverse ridges.
Loc. and Horizon. Water of Leith, at Woodhall, in the bed of shale with marine fossils.
