SEWARD: A NEW BRITISH CARBONIFEROUS FOSSIL. 235 
affinities of this fossil, we must note the discovery of apparently the 
Same structure in the Coal-Measures of France. In 188 M. 
of the former represents a spindle-shaped body 8 to 12 cm. long 
and 1°5 to 2 cm. at its broadest part, with two spirally wound ridges 
to each of which was attached a thin membranous structure with a finely 
denticulate margin. At one end (lower ?) the elongated body was 
attached to the remains of a stalk-like structure, and the opposite end 
terminated in a gradually tapered point. Fig. 3 is reduced from the 
figure of . dentata in Renault and Zeiller’s paper; it represents the 
fossi] one-half natural size. The following definition by Renault and 
Zeiller best describes the character of the genus: + ‘ Fusiform or 
cylindrical body, pointed at the two ends, borne at the top of 
a peduncle, and composed of two valves more or less concave on the 
surface, fused together by their edges, and wound ina spiral enclosing 
a central cavity. The valves marked with a line of small circular 
or elliptical scars just above the sutures. Each suture provided with 
a helicoidal and spreading collarette with an entire or denticulate 
Margin.’ 
The scars are regarded by the authors of the genus as perforations 
in the wall of the ‘valves,’ which were left on the fall of small 
spines originally attached at regular intervals immediately above the 
Spiral ridges. At the apex of Fayolia dentata the two. collarettes 
appear to have been free and slightly prolonged parallel to the axis 
of the organ. There can be no doubt that the French specimens 
are very closely allied to, if not identical with, the Stainton form. 
In the English specimen the collarette has not been preserved, but 
the original existence of such a structure is indicated by the narrow 
and fairly deep grooves seen at a, in Fig. 2. The second Commentry 
species, &. grandis, differs from F. dentata in its larger size, and in 
the absence of a denticulate margin in the collarette ; the length of 
£. grandis is given as 40 cm. 
same year in which Renault and Zeiller’s discovery was 
made known, the late Professor Weiss,{ of Berlin, recorded a new 
* Compt. rend., vol. xcviii., 1884, p. 1391. 
+ Etudes sur le terrain geen! deCommentry. Flore agror} as & Zeiller), 
Pt. i., p. 15, 1888. [Bull. Soc. indust. minérale, sér. iii., a? 
+Abh, Geol. Specialkarte von oo , und den Thigh ate Band 
v. Heft. ii. 1884, pp. 152 and 202. PI. iv. figs. 3 and 4. 
August 1894. 
