Vol. 58.| REFERRED TO MURCHISONIA AND PLEUROTOMARIA. 321 
is from the Wenlock Limestone of Dudley, and is broken so that 
only six whorls remain, which measure 38 millimetres in length and 
14 mm. in width. 
Section Gonrostropaa, Chlert.' 
GonIosTROPHA (?) ELEGANS (Sollas). (PI. VII, figs. 2-4.) 
Murchisonia elegans, W. J. Sollas, 1879, Quart. Journ. Geol. Soc. vol. xxxv, 
p. 499 & pl. xxiv, fig. 8; R. Etheridge, 1888, ‘Foss. of Brit. Is.’ vol. 1 (Paleozoic) 
p. 418. 
Diagnosis.—Shell slender, elongated, turreted, composed of 
about nine whorls. Whorls increasing gradually, angular generally 
below the middle, concave above the angle, flat below. Orna- 
mentation consisting of a fine thread above, immediately beneath 
the suture, and another below which shows above the suture on some 
of the whorls of the spire. Sinual band composed of two strong 
threads placed rather near together, with a groove between them. 
Lines of growth not very distinct, sloping back to the band above 
and forward again below, with a moderate degree of obliquity; not 
seen on the band itself. Base produced. Aperture unknown. 
Remarks and Resemblances.—Ali the members of this 
species that I have seen occur as external moulds, and the figures are 
drawn from wax-impressions. The type is in the Bristol Museum, 
and there are three other examples in the Cardiff Museum. 
Associated with the specimen called J/. elegans are three individuals 
referred to WV. gracilis, Hall, by Prof. Sollas, which appear identical 
- with it, and only differ in the band being rather higher above the 
suture. In some specimens the sutures appear very oblique, 
and in others almost horizontal; the original shells have evidently 
been contorted obliquely, so that the degree of obliquity of the 
sutures differs on each side of an individual. In one case a 
representation of the whole contour of the shell has been obtained, 
and the differences in the obliquity of the suture, and in the degree 
of the spiral angle, may be observed according to the view taken on 
the single individual, instead of on different ones. ‘The spiral angle 
may also appear either greater or less, according to the section of 
the mould made in breaking the rock. In the type (one of the 
individuals marked WM. gracilis), and also in one of the specimens at 
the Cardiff Museum, the spiral angle appears wider than the normal ; 
while in two other examples at the Cardiff Museum the spiral angle 
is less, and the whorls more exsert, which characters give the shells a 
very slender appearance. Gontostropha elegans differs from Murchi- 
sonia gracilis, Hall, in the whorls being more excavated above, and 
in the form of the band; it is quite distinct from this, and from any 
other species with which | am acquainted. As neither the outer 
lip nor the lines of growth on the band are preserved, it is im- 
possible to decide whether the shell possessed a slit or a sinus. It 
is much less robust than the typical Murchisonia, and in general 
appearance agrees more nearly with the Section G'oniostropha, 
' Bull, Soc, Rtud, Sei. Angers, 1887 (sep. cop.) p. Is. 
