265 
Buccinuni imhrlcatum, Idem, (1836, ibid., p. 229, p]. 16, fig. 17, 18, 19, 20 (fig. 9 cxclusa) 
(non Sowerby). 
3fc(Crocheilus cicuttis, L. G. de Tvoninck, 1813, Descr. Aiiim. Foss. Terr. Ccarb. Fe!g., p. 
473, pi. 40, fig. 10, et pi. 41, fig. 13. 
,, ,, Idem, 1873, Eecli. Anim. Foss., II, p. 104, pi. 4, fig. 9 (for synonymy). 
This is an elongated snhfusiform shell, n ith a regularly pointed spire 
usually composed of nine or ten convex spiral whorls. In adults the last 
spiral whorl is large, and constitutes half the total length of the shell. The 
surface is smooth, or simply ornamented with fine lines of growth. The 
aperture is elongated and suboval ; the columella has an indistinct and small 
oblique fold, above which are traces of a second still less appareut fold seen 
only in good specimens ; the external peristome of the aperture is thin and 
obliquely sinuous. 
Dimensions. — The length of an adult is from two to three eentimetres ; 
the transverse diameter, eight or ten millimetres ; and the spiral angle 52° 
to 53°. 
Relations and Differences . — This species differs from 31. imhricatus, 
J. Phillips, only by its elongated form, and the difference in its spiral angle. 
Horizon and Localities . — This species is very abundant in the Car- 
boniferous Limestone of Vise and in Yorkshire ; it is rare in that of Glasgow, 
and the corresponding shales of Bleiburg, in Carinthia. Mr. Clarke found a 
single small specimen of it in a brown argillaceous limestone at Burragood. 
Gcmms— LOXONEMA, J. Phillips. 
Loxonema difeicilis, L. G. de Koninck. 
PI.. XXIII, Fig. 23. 
This shell is elongated and conical, and composed of ten or twelve 
very slightly convex spiral whorls, separated l)y a linear, shallow, slightly 
oblique suture. The surface is perfectly smooth. 
Dimensions. — The length of the largest specimen sent me is only twenty 
millimetres ; its transverse diameter, nine millimetres ; and its spiral angle, 
31°. 
