18 R. ETHERIDGE, JTJN., ON LOWER-CARBONIFEROUS INVERTEBRATA. 



Class GASTEROPODA. 

 Genus Littorina, Eerussac. 



LlTTORINA SCOTO-BURDIGALENS1S, sp. nOV. PI. 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 re- 

 flected 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 con- 

 sideration, 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 Littorinidse, 

 and has also perhaps some characters in common with the Paludi- 

 nidas. 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 Haw 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 Bur- 

 diehouse 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. 



Log. and Horizon. Drumshough, near Dean Bridge, Edinburgh. 



Genus Pleurotomaria, Defrance, 1824. 

 Pleurotomaria monilifera, Phillips ?. PI. II. fig. 28. 



Pleurotomaria monilifera, Phill. (1836), Geol. Torksh. ii. p. 227, 

 t, 15. fig. 10 a; De Koninck (1842-45), Anim. Eoss. Terr. Carb. 

 Belg. p. 387, t. 34. fig. 2 ; Brown (1849), Eoss. 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 bor- 

 dering 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. 



