﻿244 DEVONIAN FAUNA. 



Eu. serpens, 1 as given by Goldfuss, 2 from the Carboniferous rocks, may be the 

 same species, though appearing a rather higher shell, and flatter above. 



Phanerotinus Eboracensis, Hall, is described and figured as having similar scars 

 of attachment of fragments of shells, but its spire is free and slightly elevated. 



In the British Museum is a Euomphalus from the Middle Devonian of 

 Teignmouth, with a smooth and sunken spire, which only differs from the present 

 shell by having much more numerous, smaller, and more slowly increasing whorls. 

 An apparently similar specimen is in the Torquay Museum. 



2. Genus. — Euomphalus, Sowerby, 1814. 



This large genus begins in the Cambrian or Lower Silurian, and reaches the 

 Trias, even if some Cretaceous species of Solarium ought not to be included in it. 

 There is a considerable amount of variability among its species, in the ornament, 

 in the sectional shape of the whorls, and in the elevation of the spire. 



It appears that the name Straparollus, Montf., 1810, has the priority, but 

 Sowerby's name is so generally used that a change would be inadvisable. 



Zittel divides it into several sub-genera, placing smooth species in Straparollus, 

 and striated and spirally keeled species in Euomphalus. Some of the species — as, 

 for instance, Eu. rota and Eu. radiatus — seem so like the genus Discohelix, Dunker, 

 1851, reaching from the Trias to the present time, that, as far as the shell is con- 

 cerned, the only distinguishing mark appears to be the forward, instead of back- 

 ward, curving of the strias on the back. 



1. Euomphalus Dionysii, de Montf ort, sp. PI. XXIII, figs. 20, 20 a. 



1810. Straparollus Dionysii, de Montf ort. Conch., vol. ii, p. 174. 



1813. Helicites Diontsii, Schlotheim. Jahrbucb, vol. vii, p. 35. 



1820. — priscus, Schlotheim. Petrefakten-Kunde, vol. ii, p. 60, pi. x, 



fig. 1. 

 1820. trochilinus, Schlotheim. Ibid., vol. ii, p. 60, pi. x, fig. 2. 



1 1844, Goldfuss, ' Petref. Germ.,' vol. iii, p. 88, pi. cxci, figs. 8 a, b. 



2 1879, Hall, ' Pal. N. T.,' vol v, pt. 2, p. 61, pi. xvi, figs. 19—23. 



