256 
DEVONIAN FAUNA. 
Phillips's figured types of his Eu. serpens, fig. 172 / (only). At page 222 he says 
of this and fig. 172 g, " They have a different aspect from the rest ;" and, in fact, 
they evidently differ specifically from the shell, described by him and represented 
by his figs. 172 a, h, which we have taken for the type of his restricted species, 
Eu. serpens. There is also reason to suppose that his fig. 172 g represents a 
different species, so that only his fig. J 72 / belongs to the specimens which we 
are now discussing. For these specimens I proposed the name of Eu. catenulatus, 
in the ' Geological Magazine ' for January, 1 889 ; but since then it has become 
evident that En. fenestralis has the strongly ribbed umbilicus which is distinctive 
of these specimens, and therefore there is every reason to suppose that the two 
species are synonymous. 
Affinities. — Euomphalus Lahadyi, d'Arch, and de Vern.,^ differs in having a 
single keel, and no transverse ridges on the upper surface, while it bears very 
similar radiating, rounded ridges on the umbilicus and base. These authors 
quote it from Newton, but I have not seen any fossil agreeing with it from that 
locality. 
Euomphalus concavus, F. A. Romer," has a median sulcus, but its whorls are 
much more rounded, without the strong spiral ridges, and it does not seem to 
possess any strong longitudinal bars upon the umbilicus. 
9. Euomphalus gkbmanus, Phillips, sp. PI. XXV, figs. 4, 4 a, 5, 5 a, 5 h. 
1841. Natjtilus gebmanus, Pliillips. Pal. Foss., p. 118, pi. xlviii, fig. 226. 
1853. EuoMPHALTTS DECUSSATUS, Sandberger. Verst. Ehein. Nassau, p. 210, 
pi. XXV, figs. 3, 3 a, 3 h. 
1854. Nautilus geemanus, Morris. Cat. Brit. Foss., p. 308. 
1888. — — Etheridge. Foss. Brit., vol. i, Pal., p. 168. 
1889. Euomphalus geemanus, Whidborne. Geol. Mag., dec. 3, vol. vi, p. 30. 
1889. — DECUSSATUS, Whidborne. Ibid., dec. 3, vol. vi, p. 30. 
Description. — Shell small, discoid, apparently asymmetrical, elliptically coiled 
in three or four slowly increasing whorls. Spire sunk below the summit of 
the body-whorl, almost unseen, but apparently marked very similarly to the base. 
Suture wide and rather deep. Whorls subcircular or subquadrate in section, 
flattened on the back, which is broad, and defined above and below by spiral 
ridges, and is microscopically reticulate. Ornament of the base, between the 
lower keel and the suture, consisting of five or six similar low, rounded, distant, 
1 1842, d'Aich. and de Vern., ' Geol. Traus.,' ser. 2, vol. vi, pt. 2, p. 362, pi. xxxiii, figs. 6. 
6 a, 6 b. 
2 1852, F. A. Komer, ' Beitr.,' pt. 2, p. 74, pi. xi, fig. 21. 
