280 
DEVONIAN MIJNA. 
comes very close, but is much less turrited, and has finer and more numerous 
ridges. This shell d'Orbigny separates under the name Trochus devonicus} 
Tnrbo elli^ticibs, Miinster," also approaches it very closely, but is less turrited, 
and has more rounded and numerous ridges and a smaller spire. 
Sandberger and GiebeP identify the present shell with PI. catenulata, 
d'Archiac and de Verneuil,* but it differs from that species by having a more 
angulated and less conical spire, and its ridges are less distinctly granulated ; and 
therefore it cannot be regarded as identical, although possibly allied. PI. 
catenulata, as given by Goldfuss,^ is still more clearly shown to be distinct by the 
possession of a series of three close-set spiral rows of rounded nodules imme- 
diately below the suture. 
Turho micros, Trenkner,^ is similar in general shape, but is a more 
elevated shell. 
Gyclonema Hamiltonise, Hall,'^ is also very similar, but is rather more 
elevated, and has no marks upon the flat band between the suture and the keel 
on the shoulder. It has, of course, no sinus-band. 
F. A. Romer" describes a very similar shell, to which in his letterpress he 
gives the name " Pleurotomaria scalaris, Sandberger?" but in his plates Turbo 
tricindus. His description is very slight, but, judging from his figure, it appears 
to be a more elevated species, with fewer, coarser, and more equal ridges. In a 
later part^ of his work he gives under the latter name a better figure and description, 
which show that it is very distinct, the ridges being coarsely nodular. 
3. Pleurotomaeia Lonsdalii, D'Archiac and de Verneuil. PI. XXVII, fig. 12. 
1842. Pleurotomaeia Lonsdalii, d'Archiac and de Verneuil. Greol. Trans., ser. 
2, vol. vi, pt. 2, p. 359, pi. xxxii, figs. 21, 21 a. 
1844. — — Goldfuss. Petref. Grerm., vol. iii, p. 63, 
pi. clxxxii, fig. 9. 
1853. — muroMpnAiius, Sandberffcr. Verst. Ehein. Nassau, p. 199, 
pi. xxiv, figs. 11, 11 a — d. 
1 1849, d'Orbigny, ' Prodrome,' vol. i, p. 64. 
2 1844, Goldfuss, ' Petref. Germ.,' vol. iii, p. 91, pi. cxcii, figs. 10 a, h. 
2 1866, Giebel, ' Eepertorium,' p. 99. 
* 1842, d'Archiac and de Verneuil, ' Geol. Trans.,' ser. 2, vol. vi, pt. 2, p. 359, pi. xxxii, fig. 17. 
^ 1844, Goldfuss, ' Petref. Germ.,' vol. iii, p. 63, pi. clxxxii, fig. 11. 
6 1867, Trenkner, ' Palaont. Novit.,' pt. 1, p. 8, pi. i, fig. 14. 
7 1879, Hall, ' Pal. N. T.,' vol. v, pt. 2, p. 37, pi. xii, figs. 34—36. 
8 1850, 1. A. Eomer, ' Beitr.,' pt. 1, p. 15, pi. iii, figs. 14 a, h. 
9 1855, ibid., pt. 3, p. 14, pi. iii, figs. 19 a, h. 
