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 PI. 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 ray 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 cordial ianas, 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. Anthracomya Wardi, Salter, MSS. Plate XIII, figs. 13, 15, 1G; Plate XV, 



figs. 1—4, 12—20. 



Anthracomya Wardi, Ward. Trans. North Staff. Inst. Min. aud Mech. Engin., 



vol. x, p. 126, with description by It. Etheridge, 

 F.E.S., 1890. 

 — Hind. Quart. Journ. Geol. Soc, vol. xlix, p. 271, pi. ix, 

 figs. 9 and 10, 1893. 

 angitsta, Hind. Ibid., p. 268, pi. x, fig. 15, 1893. 



Specific Characters. — Shell transversely oblong, with the upper and lower 

 margins almost parallel, slightly 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 



14 



