﻿EUOMPHALUS. 245 



1820. Helicites ellipticus, Schlotheim. Ibid., vol. ii, p. 60, pi. x, fig. 3. 



1823. Cibeus eotundatus, Sowerby. Min. Conch., vol. v, p. 30, pi. ccccxxix, 



figs. 1, 2. 

 1836. — — Phillips. Geol. Torks., vol. ii, p. 226; pi. xiii, 



fig. 15 ; and pi. xv, fig. 32. 

 1840. Euomphalus helicifobmis, Munster. Beitr., pt. 3, p. 85, pi. xv, fig. 6. 

 1842. Cierus eotundatus, var., d'Arch. and de Vern. Geol. Trans., ser. 2, 



vol. vi, pt. 2, p. 389. 

 1844. Euomphalus anguis, M'Goy. Syn. Carb. Foss. Ireland, p. 35, pi. iii, fig. 11. 

 1848. Stbapabollus priscus, d'Orbiyny. Prodrome, p. 65. 

 1848. — Diontsii, d'Orbigny. Ibid., p. 120. 



1853. Euomphalus l^vis, var. tubbitus, Sandberger. Verst. Rhein. Nassau, 



p. 213, pi. xxv, figs. 1,1 a, 7 b. 



1854. — Diontsii, Morris. Cat. Brit. Foss., p. 247. 



1857. — voetex, Eichwald. Bull. Soc. Nat. Moscov., p. 166. 



1860. — — — Letbaea Eossica, p. 1150, pi. xlii, figs. 



15 a, b. 

 1876. — Diontsii, F. Rimer. Lethaea Pal., pt. 1, pi. xlv, fig. 9. 



1878. — ophibensis, Rail and Whitfield. Eep. Geol. Fortieth 



Parallel, by C. King, pt. 2, p. 261, 

 pi. iv, figs. 26, 27. 

 1881. — Diontsii, de Koninck. Ann. Musee Royal H. N. Belgique, 



vol. vi, pt. 3, p. 120, pi. xiii, 

 figs. 8 — 10; and pi. xiv, figs. 16, 18. 



Description. — Shell small, conical, depressed, of numerous slowly increasing 

 whorls. Spire forming a low cone of about five volutions. Suture deep aud wide. 

 Whorls smooth, spreading horizontally from the suture, nearly circular in section. 

 Shell-structure smooth. 



Size. — Height 10 mm., width about 15 mm. 



Locality. — Lummaton. There is a specimen in the Woodwardian Museum. 



Remarks. — Euomphalus Dionysii is a well-known and common Carboniferous 

 species, which has been described by many authors from de Montfort to de Koninck, 

 who has given a very long synonymy. Whether it is also to be registered in the 

 Devonian list is much more open to question. Various fossils have been 

 described by various paleontologists under several names from Devonian rock 

 which are very similar, and which there is much reason to regard as identical, 

 especially as the Carboniferous species is subject to a considerable amount of 

 variation, which is sometimes such as to include the Devonian forms. 



The small shell in the Woodwardian Museum is the only evidence of its occur- 

 rence in the localities now under notice, and this shell is not sufficiently perfect to 

 enable us to come to a very positive decision in the matter. There are numerous 

 specimens of Eu. Dionysii from Carboniferous beds in the British Museum aud 

 the Museum of Practical Geology, and several others are figured by de Koninck. 



