316 
DEVONIAN FAUNA. 
be the original of Phillips' figure of M. tricincta (fig. 190*), but does not show 
such an elaborate ornamentation as is represented in his figure. It is a suffi- 
ciently distinct species, and is characterised by its numerous and narrow whorls, 
its low-set, narrow sinus-band, and slight indistinct spiral ridges. It was iden- 
tified by Phillips with ScMzostoma tricinctum, Miinster,^ but the above-mentioned 
points all separate it from that shell, which in fact is, in all probability, only a 
variety of Mtioxhisonia turbinata, Schlot. It therefore becomes needful to find 
another name for the species. 
It agrees accurately with Pleurotomaria trilineata, Sandb., but the name M. 
trilineata was before used by Goldfuss^ for quite a different shell with much 
shorter spire and smooth whorls. 
Affinities. — Pleurotomaria dentalo-lineata, Sand.,^ diff'ers in having reticulated 
strige above the sinus-band, in having a coarsely and convexly-barred sinus-band 
situated lower on the whorls, in being sinistral, and having more quickly-increasing 
whorls. PI. bilineata, Sandberger,* not d'Archiac and de Verneuil, has broader 
whorls and a lower sinus-band. 
- Murchisonia quadricincta, Trenkner,^ is very similar, and may perhaps be the 
same species. According to his figure it has evenly convex whorls with one or 
two spiral ridges just below the suture, and three others on the lower part of the 
whorl. 
From M. loxonemoides it differs in several particulars as mentioned under that 
species, e. g. its narrow whorls, coarser and more distant transverse striae, and 
more median sinus-band. 
M. conula, de Koninck,^ has four strong keels on its whorls, and the sinus- 
band is median. 
I have been in much doubt whether M. Hercynica, F. A. Romer,'^ is the same 
as this shell, with which Clarke^ is inclined to unite it, or with M. turbinata, 
Schlotheim. Romer's figure is very indistinct and his description might apply to 
either. After repeated examinations I am inclined to think that its shape and the 
median position of its sinus-band points to its identity with the latter species rather 
than with the present. 
1 1840, Miinster, 'Beitz.,' pt. 3, p. 87, pi. xv, figs. 14 a, b. 
2 1844, Goldf., ' Petref.,' vol. iii, p. 25, pL clxxii, figs. 8, 8 a. 
^ 1853, ISandberger, ' Verst. Ehein. Nassau,' p. 201, pi. xxiv, figs. 14, 14 his, 14 a. 
■* Ibid., p. 204, pi. xxiv, fig. 17. 
5 1868, Trenkner, ' Paliiont. JSTovit.,' pt. 2, p. 22, pi. vii, fig. 10. 
1883, de Koninck, ' Ann. Mua. Eoy. H. N. Belg.,' vol. viii, pt. 4, p. 17, pi. xxxiv, figs. 9, 10. 
7 1843, F. A. Eomer, ' Verst. Harzgeb.,' p. 29, pi. viii, fig. 2. 
s 1884, Clarke, ' Neues Jahrb. f. Min.,' Beil.-Band iii, p. 345. 
