PHANEROTINUS. 
261 
Affinities. — The original Eu. serpula, de Koninck,^ is a Carboniferous shell, 
and seems to differ from this species in being more regularly and closely coiled 
and in having two narrow distant spiral grooves upon its upper surface. Its 
apical whorls are rather elevated. 
Goldfuss's figures of Eu. serpula^ are distinguished by being circularly and much 
more closely coiled. Their whorls show nearly the same rate of increase as do those 
of the present shell. De Koninck considers that only Goldfuss's var. teres {la 
and 1 e) belong to his species. 
Euomphalus vermilia, Goldf.,^ is distinguished by its more slowly increasing 
whorls, and by the possession of four spiral strias. 
Ph. intermedins, de Koninck,* and Ph. Archimedis, de Koninck,^ are also 
distinguished by their circular coiling and spiral striae. 
Ph. laxus, Hall,® differs in being circularly and more regularly coiled, in being 
marked with much coarser and more distant striae, in being on the whole slower 
in its rate of increase, and in having a slightly expanded mouth. 
2. Phanerotinus mundus, n. sp. PL XXV, figs. 12, 13. 
1842. Euomphalus sekpula, d'Arch. and de Vern. (pars) (not de Koninck). 
Geol. Trans., ser. 2, vol. vi, pt. 2, 
p. 363, pi. xxxiii, fig, 9 (only). 
Description. — Shell small, discoid, flat, circularly coiled, slowly increasing ; 
apex very minute. Spire free, almost flat above, consisting of about three or four 
volutions, comparatively closely coiled, the distance of each whorl from that 
within being about a quarter its breadth. Whorls nearly circular in section, 
smooth or marked only by indistinct growth-lines. 
Size. — A small specimen measures in height 1*5 mm., in width 5 mm. 
Localities. — There is a specimen in the Museum of Practical Geology from 
Wolborough, and two small specimens perhaps from Lummaton in the Torquay 
Museum. 
Remarks. — These shells present very few points for definition. They are 
characterised by their whorls being free from the apex, and yet coiled in close 
proximity. The rate of increase seems to be decidedly slow. The best Torquay 
^ 1842-4, de Koninck, 'Desc. Anim. Foss.,' p. 425, pi. xxiii bis, figs. 8 a, b, and pi. xxv, fig. 5, and 
1883, de Koninck, 'Ann. Mus. Eoyal H. N. Belg.,' vol. viii, pt. 4, p. 4, pi. xxii, figs. 1 — 3. 
2 1844, Goldfuss, ' Petref . G-erm.,' vol. iii, p. 86, pi. cxci, figs. 1 a — e. 
3 1844, Goldfuss, ' Petref. Germ.,' vol. iii, p. 86, pi. cxci, fig. 2. 
* 1883, de Koninck, 'Ann. Mus. Royal H. N. Belg.,' vol. viii, pt. 4, p. 5, pi. xxii, figs. 5, 6. 
^ Ibid, p. 5, pi. xxii, figs. 7, 8. 
6 1861, Hall, ' Desc. New Species of Fossils,' p. 26. 
