ANTHRACOMYA WARDI. 105 
In my original account of this species I gave the Bowling Alley Seam as the 
horizon of a second specimen figured now on Pl. XV, fig. 20, but which evidently 
should be more correctly referred to A. Wardi. 
Observations.—This species is founded on a single specimen, and I have met 
with no shell at all like it in any of the Collections I have examined in the British 
Isles. 
The form is distinct from all others, the one most closely approaching it being 
the elongate variety of A. minima, to which I have given the name A. minima, var. 
carinata, but this species is more carinate and smaller. 
Mr. Robert Etheridge, F.R.S., referred my shell to Modiola lithodomoides 
(R. Etheridge, jun.), and it was on this authority that Mr. John Ward figured it 
under this name (op. supra cit.). Modiola lithodomoides, a species probably 
synonymous with Mytilus cordiolianus, de Ryckholt, is a much larger shell found 
in the typically marine beds of the Mountain Limestone, and possesses marked 
modioliform characters, which are conspicuously absent in A. lanceolata. It is 
impossible to confound the two shells if they are compared, as they have little or 
nothing in common. 
6. AnrHracomya Warot, Salter, MSS. Plate XIII, figs. 18, 15, 16; Plate XV, 
figs. 1—4, 12—20. 
ANTHRACOMYA WarpI, Ward. Trans. North Staff. Inst. Min. and Mech. Engin., 
vol. x, p. 126, with description by R. Etheridge, 
F.R.S., 1890. 
= — Hind. Quart. Journ. Geol. Soc., vol. xlix, p. 271, pl. ix, 
figs. 9 and 10, 1893. 
_ aneusta, Hind. Ibid., p. 268, pl. x, fig. 15, 1893. 
Specific Characters.—Shell transversely oblong, with the upper and lower 
margins almost parallel, shghtly convex. 
The anterior end is short, comprising about one quarter of the shell; its border 
forms a right angle above with the hinge-line, but it is rounded below, and passes 
into the inferior border in one gradual curve. The inferior border is straight, and 
inclined very slightly downwards as it passes backwards. The posterior border 
is blunt, very slightly truncate from above downwards. The upper part is 
sinuated, so that the posterior superior angle of the shell is a right angle. The 
posterior inferior angle is blunt and rather less than a right angle. The hinge-line 
is straight, extending the whole length of the upper border, not elevated posteriorly. 
The umbones are flattened, small, and inconspicuous, hardly raised above the 
hinge-line, and are situated in the anterior third of the shell. A blunt, oblique 
tumidity extends from the umbonal area backwards and downwards towards the 
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