Hind — Notes on the Homotaxlal Equivalents, &fc. 109 



reticulate. These differences depend, the one on the growth of the 

 individuals, and the other on the state of preservation. I have 

 compared a large number of individuals from both localities, and am 

 unable to recognise more than one species. Brown's name, therefore, 

 is adopted on the grounds of priority. 



Macrocheilina Gibsoni, Brown sp. 1841. PI. v., fig. 16. 



Buccimm Gibsoni^ Brown, 1841. Trans. Manch. Geol. Soc, vol. i., 

 p. 221. PL vii., figs. 48, 49. Macrocheilina injiatiLS^ Paily, 

 Expl. sheet 142, Geol. Surv., Ireland, p. 14, fig. 6. 



Specific characters — Shell small ; last whorl ventricose. Spire of 

 four or five whorls, the last comprising two-thirds of the shell. 

 The apex acute. The whorls are convex ; the suture moderately 

 deep and simple. Aperture oblong, ovate ; outer lip sharp, raised 

 where it joins the columella. Surface ornamented by fine vertical 

 lines of growth. 



Bimensioyis — Height, 4 mm. ; breadth, 3 mm. 



Localities — England : The Pendleside series of High Greenwood, 

 near Todmorden. Ireland : Shales immediately above the Carboni- 

 ferous Limestone at Foynes Island. 



Olservations — I have no doubt that Baily's shell is identical with 

 the Buccinum elegans of Brown, having compared numerous individuals 

 from both localities. The same fauna occurs in both localities, as is 

 pointed out by Baily {op. supra cit.). Macrocheilina elegayis sp. is 

 closely allied ; but the spire does not increase so rapidly, and the 

 whorls are not so convex. 



Macrocheilina elegans, Brown sp. 1841. PI. v., fig. 15. 



Buccimm elegans^ Brown, 1841. Trans. Manch. Geol. Soc, vol. i., 

 p. 221. PI. vii., figs. 50, 51. 



Specific characters — Shell small, elongate, ovate ; spire consisting 

 of four to five gradually diminishing whorls, of which the last forms 

 about half the shell. Whorls moderately convex ; suture moderately 

 deep. Aperture ovate, simple. The surface is almost smooth; but 

 the microscope reveals vertical lines somewhat distant. 



Dimensions — Height, 9 mm. ; breadth, 7 mm. 



Localities — England : The Pendleside series of High Greenwood, 

 near Todmorden. Ireland : Shales immediately above the Carboniferous 

 Limestone, Foynes Island. 



R.I. A. PROC, VOL. XXV., SEC. R.] K 



