. Bulletin of the British Museum (Natural History). 98 COCKS & RONG 'Hesperonomia' striata Xu, Rong & Liu, 1974: 144; pi. 64, figs 29-31 from Lower Meitan Formation (L. Arenig), Sinan, NE Guizhou, China. Schedophyla subquadrata Xu & Liu, 1984: 201 pars; pi. 14, figs 30, 31, non fig. 20; pi. 15, figs 6-8, 20 from Lower Meitan Formation (L. Arenig), Yanhe, NE Guizhou, China. Species questionably assigned Schedophyla interrupta Xu, in Liu et al. 1983: 276; pi. 92, figs 10-12 from U. Dawan Formation (U. Arenig), Nanjing, Jiangsu Province, China (no interiors known). Schedophy
. Bulletin of the British Museum (Natural History). 98 COCKS & RONG 'Hesperonomia' striata Xu, Rong & Liu, 1974: 144; pi. 64, figs 29-31 from Lower Meitan Formation (L. Arenig), Sinan, NE Guizhou, China. Schedophyla subquadrata Xu & Liu, 1984: 201 pars; pi. 14, figs 30, 31, non fig. 20; pi. 15, figs 6-8, 20 from Lower Meitan Formation (L. Arenig), Yanhe, NE Guizhou, China. Species questionably assigned Schedophyla interrupta Xu, in Liu et al. 1983: 276; pi. 92, figs 10-12 from U. Dawan Formation (U. Arenig), Nanjing, Jiangsu Province, China (no interiors known). Schedophyla sp. of Xu & Liu 1984: 202; pi. 15, fig. 9 from Lower Meitan Formation (Arenig), Yanhe, NE Guizhou, China (no brachial valve interior known). Subfamily PELONOMIINAE nov. Diagnosis. Not resupinate, although fairly flat. No platform. Remarks. Pelonomia is difficult to place, except that it is undoubtedly a plectambonitacean. It is close to the Taffiinae, but has no platform and we therefore erect a new subfamily for the genus. Genus ASSIGNED. Pelonomia Cooper, 1956. Range. Llanvirn. PELONOMIA Cooper, 1956 1956 Pelonomia Cooper: 699 1965 Pelonomia Williams: H372 Type SPECIES. Orthis delicatulaBWYrngs, 1865. Diagnosis. Slight fold in pedicle valve with corresponding sulcus in brachial valve. Larger pseudopunctae seen on dorsal sulcus. Remarks. The only species is small, but it is distinctive and difficult to place systematically. Pseudopunctae are clearly visible and there is a simple single cardinal process, and so it is undoubtedly a plectambonitacean. However, the speci- mens illustrated so well by Cooper (1956: pi. 223) are not the original type specimens of Billings, and until the latter are revised, there must remain some doubt as to the identity of the species and genus. Species assigned Orthis delicatula Billings, 1865: 217 (revised by Cooper 1956: 699; pi. 223, figs 8-10) from the Table Head Formation (Llanvirn) near Table Head, Newfoundland, Canada. Subfamily SPANOD
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