. Bulletin of the British Museum (Natural History), Geology. 64 MORRIS, DICKINS AND ASTAFIEVA-URBAITIS I. Fig. 10 Myofossa hindi sp. nov. Lower Carboniferous, Visean, Asbian, Redesdale Ironstone, Redesdale, Northumberland. Figs lOa-d, BM L47511, holotype, bivalved specimen (Hind, 1900: pi. 44, fig. 3); Fig. 10a, dorsal view; Fig. 10b, view of left side; Fig. 10c, ventral view; Fig. lOd, anterior view. Fig. lOe, BM L3231, paratype, view of left valve of steinkern; PA — posterior adductor, PS — pallial sinus. All x2. Myofossa (Myofossa) costellata (M'Coy, 1851) Figs 1, 12a-d 1851a Leptodomus cos
. Bulletin of the British Museum (Natural History), Geology. 64 MORRIS, DICKINS AND ASTAFIEVA-URBAITIS I. Fig. 10 Myofossa hindi sp. nov. Lower Carboniferous, Visean, Asbian, Redesdale Ironstone, Redesdale, Northumberland. Figs lOa-d, BM L47511, holotype, bivalved specimen (Hind, 1900: pi. 44, fig. 3); Fig. 10a, dorsal view; Fig. 10b, view of left side; Fig. 10c, ventral view; Fig. lOd, anterior view. Fig. lOe, BM L3231, paratype, view of left valve of steinkern; PA — posterior adductor, PS — pallial sinus. All x2. Myofossa (Myofossa) costellata (M'Coy, 1851) Figs 1, 12a-d 1851a Leptodomus costellatus M'Coy: 174. 1855 Leptodomus costellatus M'Coy; M'Coy: 508; pi. 3f, fig. 5. 1900 Sanguinolites costellatus M'Coy; Hind: 377-9; pi. 41, figs 8-10. Syntypes. SM E13273 (M'Coy, 1855: pi. 3f, fig. 5), and four unfigured syntypes, SM E9319-22, all from the Lower Lime- stone Series (Visean) of Craige, Kilmarnock, Ayrshire, Scotland. Remarks on nomenclature. Myofossa costellata is a junior secondary homonym of Sanguinolites costellatus M'Coy, 1844, considered by Hind (1900: 379) to be the posterior end of an internal cast of Solemya costellata. Discussion. Myofossa costellata is evenly ribbed, and has 50% more ribs per unit distance from the umbones than M. hindi. Like M. hindi, it also occurs in very fine-grained facies It is more elongate than the other species described here. It has not been found to occur with either M. omaliana or M. hindi. The fine ribbing recalls that of Ragozinia, but it dies not have the smoother sub-umbonal part of the flank. Subgenus RAGOZINIA Muromzeva, 1984 Type species. Myofossa (Ragozinia) dembskajae (Muromzeva & Guskov, in Muromzeva 1984) (? = Myofossa (Ragozinia)' amatopensis (Thomas, 1928)). Myofossa (Ragozinia) amatopensis (Thomas, 1928) Figs 13a-e 1928 ?Sanguinolites amatopensis Thomas: 224—5; pi. 6, figs 10, 10a. 1963 Chaenomya sp. Dickins: 51; pi. 8, figs Please note that these images are extracted from scanned page imag
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