i6o 
PROCEEDINGS COTTESWOLD CLUB 
1916 
PALEONTOLOGICAL APPENDIX 
BY 
F. R. C. REED, M.A., D.Sc., F.G.S. 
Chonetes ceratoides, sp. nov. [PI. VIIL, figs, i, 2.] 
Description. — Shell, semi-circular to semi-elliptical, widest along hinge- 
line ; cardinal angles acute, depressed, pointed at about 6o°, very rarely 
produced into small ears or semi-cylindrical. Pedicle- valve uniformly 
convex, rather strongly swollen, with small incurved, rather inconspicuous, 
beak, not overhanging hinge-line. Brachial valve flat to gently concave. 
Hinge-line furnished with three long equidistant straight spines on each side 
of sub-equal length, directed obliquely outwards in plane of valve, one 
spine arising close to the cardinal angle and the others respectively at two- 
thirds and one-third the distance from the beak ; spines nearly as long as 
shell. Surface of shell covered with twenty-five to thirty-five low rounded 
closely-placed equal riblets, mostly primaries, nearly or quite obsolete at the 
cardinal angles, with very fine concentric striation over all. 
Dimensions : Length (average), 4%, 
Width (average), 6%. 
Horizon and Localities. — Wenlock Shale : half a mile 
West of Bettws-Newydd Church and in roadside above Upper 
Wern-hir, Ludlow beds : (i) East bank of Usk, 300 yards 
above Chain Bridge ; (2) by Cwm Dowlais Brook at extreme 
East of Inlier ; (3) just above Wenlock Limestone, 600 yards 
South-East of Common, Coed-y-paen ; (4) 600 yards South of 
Rhadyr Farm ; (5) 600 yards West of Llangibby Castle. 
Remarks. — This small and rather abundant shell is most 
allied to Chonetes cornuta Hall,' from the Clinton formation. 
It is also related to Chonetes edmundsi Williams,^ from the 
American Silurian, but ours has fewer riblets. The Swedish 
species, Chonetis Piperi Moberg and Gronwall,^ may also be 
compared. It is certainly distinct from the typical Chonetes 
striatella Dalm. as represented in Britain, though one of 
Davidson's'^ specimens from the Pentland Hills appears to be 
rather similar. 
1 Hall and Clarke, Palaeont. N.Y., vol. viii., Brach. I., pi. xvi., fig. i. 
2 Williams, Proc. U.S. State Mus., vol. 45, No. 1985 (1913), P- 323. pl- 29, fig. 6-9. 
3 Moberg and Gronwall, Om Fyledalens gotland (Lunds Univ. .Arsskr. N.F. 2, Bd. 5, No. i 
fioog), P- 34i pC Ih. figs. 14-16. 
4 Davidson, Mon. Brit. Foss. Brach., vol. iii., p. 331, pl. xlix., fig. 23 (non cet). 
