298 CARBONIFEROUS LAMELLIBRANCHIATA. 



which at this place is very fossiliferous, and the fauna, as far as has been ascer- 

 tained at present, contains a very large percentage of the fossils collected at 

 Lowick by the Rev. E. Jenkinson. The identical bed where the Lowick fossils 

 were obtained is not now exactly known, but it is an important fact that the lime- 

 stone at the Coombs, which lies about forty miles S.S.B. of Lowick, from 

 its relation to the Redesdale limestone below and the Four Laws coal above, must 

 be the Four Laws limestone; and this may lead to the identification of the fossil- 

 bearing bed at Lowick. 



The narrow extended anterior end and the squarely cut posterior border are very 

 characteristic of the species ; and in addition I regard the approach to an oblique 

 ridge from the umbo to the posterior inferior angle, a feature very rare in the 

 Edmondidse, as an important specific character. 



Bdmondia oblonga, Portlock, sp., 1843. Plate XXIX, figs. 1 — 3 and 5. 



Sanguinolabia oblonga, Portlock, 1843. Geol. Eep. Londonderry, p. 434, pi. 



xxxvi, fig. 2. 

 — — Brown, 1849. Illustr. Toss. Conch., p. 219, pi. xc, 



fig. 43. 

 ? P anop^a Coyana, de Ryckliolt, 1853, Melanges paleontol. p. 31, pi. xi, figs. 7 and 8. 

 Sanguinolites oblonga, Morris, 1854. Cat. Brit. Foss., 2nd edit., p. 223. 

 Edmondia oblonga, If'Oog, 1855. Brit. Pal. Poss., p. 501, pi. 3 P, fig. 10. 



— unionifobmis, Salter, 18G1. Mem. Geol. Surv. Gt. Brit., Iron Ores 



Gt. Brit., pt. 3, p. 221, pi. i, fig. 29. 



— oblonga, Young and Armstrong, 1871. Trans. Geol. Soc. Glasg., 



vol. iii, Suppl., p. 51. 

 1876. Carb. Poss. West of Scot- 

 land, p. 54. 



— Roemer, 1876. Lethaea Palaeoz., pi. xliv, fig. 5. 



— Bigsbg, 1878. Thesaurus Devonico-Carb., p. 307. 



— Etheridge, 1888. Brit. Poss., pt. 1, Palaeozoic, p. 2S3. 



Specific Characters. — Shell of moderately large size, transversely oblong, tumid, 

 very inequilateral, slightly oblique, margins subparallel. The anterior end short 

 and gibbose, and narrower in the dorso- ventral direction than the posterior. The 

 anterior border is curved, its junction with the hinge-line above often approaching 

 to a rounded right angle ; below, the curvature sweeps broadly round into the in- 

 ferior border, which is convex at each extremity, but nearly straight for the 

 greater part of its extent. The posterior border is very bluntly rounded, ap- 

 proaching to angulation at the junction with the upper and lower borders, so that 

 the posterior end is subquadrate. The hinge-line is very nearly straight and pro- 

 longed posteriorly. The umbones are moderately large, tumid, curved, slightly 



