314 
DEVONIAN FAUNA. 
In M. cingulata, d'Arclimc^ (not Hisinger), and M. Loesseni,KajserJ^ the sinus- 
band forms a very elevated broad and flat ridge along the centre of the whorl. 
If. spirata, Goldfuss,' is very similar to some of the smooth forms of our species, 
but I do not think that it is likely to be a variety of it, as it differs in the possession 
of several coarse spiral ridges below the sinus-band. 
M. moniliformis, Lindstrom/ and If. Hebe, Billings/ are distinguished by having 
regularly globose or convex whorls. 
2. MuRCHisoNiA ViOARiANA, n. sp. Plate XXX, figs. 13 — 15. 
Description. — Shell of moderate size, very elongate and subulate, turrited and 
finely tuberculated. Apex sharp. Spire elongated, irregularly coiled, and some- 
times rather deflected, of eight or nine volutions. Suture deep, obtuse. Whorls 
slightly convex, more or less flattened on the back ; curving round gently below 
to form a sloping oblique base. Sinus-band median, very prominent, narrow, 
consisting of an almost linear groove between two rounded ridges. Ornament con- 
sisting of two low, beaded, rounded ridges between the suture and the sinus-band, 
separated by similar grooves, and two or sometimes three similar ridges below the 
. sinus-band, of which only one is visible on the upper whorls ; the whole crossed 
by numerous, close, sharp, lamellar, very irregular, undulating strige or growth- 
lines, which trend rather backwards above, and forwards below the sinus-band, over 
which they are gently recurved. Mouth elongate, pointed above, produced sub- 
angulated and slightly excavate below. Outer lip gently convex. Inner lip 
callous, diffuse. Columella long, straight, thickened. Umbilicus minute or 
obliterated. Shell-structure thick except on the back of the whorls. 
Size. — Height 40 mm., width 15 mm. 
Locality. — Chudleigh. There are five specimens in Mr. Vicary's Collection. 
Remarhs. — These fossils are closely allied to M. turhinata, Schlot., and I am in 
some doubt whether they are more than a variety of that very variable shell. 
They seem, however, to be separated by several constant diff'erences, and there is 
little or no indication of any passage between them and its various forms. 
^ 1845, MurchisoD, de Verneuil, and de Keyserling, ' Greol. Russ.,' vol. ii, p. 339, pi. xxii, 
figs. 7 a, h. 
2 1889, Kayser, ' Abliandl. Konig. Preuss. Geol. Laudes.,' Neue Folge, Heft 1, p. 15, pi. viii, fig. 9, 
3 1844., Goldf., ' Petref. Germ.,' vol. iii, p. 24. pi. clxxii, figs. Qa, b. 
4 1884, Lindstrom, ' Sil. Gast. Gottland,' p. 128, pi. xii, figs. 5, 6. 
» 1874, Billings, ' Palajozoic Possils,' vol. ii, pt. 1, p. 57, fig. 28, pi. v, fig. 6. 
