264 MISS JAIfE DONALD ON THE GENEEA [May 1 899, 



Remarks and Resemblances. — A much weathered fragment 

 of a shell, consisting of portions of three whorls, was referred with a 

 query by Salter to Murclnsonia hellicincta, Hall. So far as can be 

 judged, however, the spiral angle is smaller than that of Hall's 

 species, also the whorls are less convex. Therefore I provisionally 

 separate it under the specific name of dubia, and place it in the 

 genus Hormotoma until better specimens are discovered, enabling its 

 true affinities to be discerned. 



Dimensions. — The length is 26 mm. and the width 24 mm. 



Locality and Horizon. — Durness Limestone, Sutherland. 



HOEMOTOMA CINGULATA (His.). (PI. XXI, figS. 14-17.) 



*? Turhinites Icevis major etc., Bromell, 1738, ' Lithogr. Suec' in Acta Lit. Sueciae, 

 vol. iii, p. 37. 



Turritella cingulata, W. Hisinger, 1829, ' Esquisse d'un Tabl. des Petr. de la 

 Suede,' 1st ed. p. 11; 1831, ' Auteckn.' vol. v, p. 115 & pi. ii, fig. 1; ' Esquisse d'un 

 Tabl. des Petr. de la Suede,' 2nd ed. p. 9 ; 1837, ' Leth. Suec' p. 39 & pi. xii, fig. 6«. 



Non Fleurotomaria cingulata, L. von Buch, 1840, ' Beitr. zur Bestimm. d. Gebirgs- 

 form. V. Russland,' p. 116; *? W. Hisinger, 1841, ' Fortekuing,' p. 56. 



MurcMsonia cingulata, A. d'Arcliiac & E. de Verneuil, 1841, Bull. Soc. geol. 

 France, vol. xii, p. 159 ; non Murchison, De Verneuil & Von Keyserling, 1845, 

 ' Russia & the Ural Mts.' vol. ii, p. 339 & pi. xxii, figs. 7 a & b ; non F. M'Coy, 1846, 

 ' Syn. Silur. Foss. Irel.' p. 16 & pi. i, fig. 18. 



Terehra (?) sinuosa, J. W. Salter, 1848, Mem. Geol. Surv. vol. ii, pt. i, p. 357 & 

 pi. xiv, fig. 2 {non Sowerby, 1839, ' Sil. Syst.' p. 619 & pi. viii, fig. 15, nee Phillips, 

 1841, ' Pal. Foss. Cornw., Dev., & W. Som.' p. 99 & pi. xxxviii, fig. 182). 



MurcMsonia cingulata (pars), H. G, Bronn, 1848, ' Index Palaeont.' p. 747 ; (pars) 

 A. d'Orbignj', 1850, ' Prodr. Paleont. strat.' vol. i, p. 31; J. Morris, 1854, Cat. Brit. 

 Foss. p. 259 ; F. M'Coy, 1855, ' Brit. Pal. Foss.' p. 293 ; ? F. Schmidt, 1858, Ai-chiv 

 Naturk. Liv-, Ehst- u. Kurlands, ser. 1, vol. ii, p. 202. 



Non Fleurotomaria cingulata, Eichwald, 1860, ' Leth, Eoss.' vol. i, pt. ii, p. 1166 & 

 pi. xliii, fig. 6. 



MurcMsonia cingulata (pars), J. J. Bigsby, 1868, ' Thes. Sil.' p. 158 ; J. W. Salter, 

 1873, Cat. Cambr. & Silur. Foss. p. 172; non F. Roemer, 1876, 'Leth, Geogn.' 

 pi. xiv, fig. 11 ; non A. Krause, 1877, Zeitschr. deutsch. geol. Gesellsch. vol. xxix, 

 p, 22 ; *non Kiesow, 1884, ' Ueber Sil, u. Dev, Geschiebe Westpreussens,' p, 58 ; 

 G, Lindstrom, 1884, ' Silur, Gastr, & Pter. Gotland,' Kongl. Svensk. Vet,-Akad, Handl. 

 vol. xix, no, 6, p. 127 & pi, xii, figs, 9-10; {pars) R. Etheridge, 1888, ' Foss. Brit. Is.' 

 vol. i (Palaeozoic) p, 113, 



Description. — Shell large, very elongated, composed of more 

 than eleven gradually increasing whorls. Whorls compactly coiled, 

 broad and flat, being very slightly convex. Ornamentation con- 

 sisting of numerous fine spiral striae. Sutures shallow. Sinual 

 band situated low down on the whorl, level with the surface, or 

 rather depressed, defined on each side by a fine raised thread or merely 

 by the lines of growth. Lines of growth distinct, strong, irregular in 

 strength, curving very obliquely backward to and forward from the 

 band. Aperture imperfectly known. Inner lip reflected on the 

 body-whorl. Base slightly flattened, having a short distance below 

 the band a subangularity, which occasionally shows above the suture 

 on some of the higher whorls. Test thin. 



Eemarks. — The British shell which has been referred to this 

 species, though agreeing with Hisinger's figure and description ^ in 

 other respects, appeared to difi'er in having a smaller spiral angle; 



* These references are taken from Prof. Lindstrom's work on the Silur. 

 Gastropoda & Pteropoda of Gotland, for I have not been able to see the works 

 myself. 



1 ' Leth. Suec' 1837, p, 39 & pi. xii, fig. 6a. 



