. Bulletin of the British Museum (Natural History), Geology. 86 arcaeformis are known it may well prove correct to synony- mize Pleurophorella with Sphenotus; in the meantime we prefer to use Pleurophorella, where these characters are now known. Pleurophorella papillosa Girty, 1904 Fig. 37 1904 Pleurophorella papillosa Girty: 729-32; pi. 45, figs 4-6; pi. 46, fig. 5. 71969 Pleurophorella papillosa Girty; Chavan: N546. Material. A single specimen, USNM G. A. C. Collection, from the Upper Pennsylvanian ('Upper Finis'), hills 0-5-1. Fig. 37 Pleurophorella papillosa (Girty). Upper Carboniferous, U
. Bulletin of the British Museum (Natural History), Geology. 86 arcaeformis are known it may well prove correct to synony- mize Pleurophorella with Sphenotus; in the meantime we prefer to use Pleurophorella, where these characters are now known. Pleurophorella papillosa Girty, 1904 Fig. 37 1904 Pleurophorella papillosa Girty: 729-32; pi. 45, figs 4-6; pi. 46, fig. 5. 71969 Pleurophorella papillosa Girty; Chavan: N546. Material. A single specimen, USNM G. A. C. Collection, from the Upper Pennsylvanian ('Upper Finis'), hills 0-5-1. Fig. 37 Pleurophorella papillosa (Girty). Upper Carboniferous, Upper Pennsylvanian, Upper Finis Shale; hills 0-5—1 mile north of a point 0-3 miles NE of intersection of old Chico Road, 3-2 miles east of Jacksboro, Texas; USNM, Collection; dorsal view with ligament in place; c. x 1. MORRIS, DICKINS AND ASTAFIEVA-URBAITIS mile north of a point 0-3 miles north-east of intersection of old Chico road and Wizard Wells Road, 3-2 miles east of Jacksboro, Texas. Diagnosis. Shell surface with fine, close-packed pustules all over, otherwise without ornament. Nymphs slender and long, nearly half the length of the escutcheon. Remarks. We figure a specimen (Fig. 37) that conforms to Girty's original description and comes from the same area and horizon. It shows the nature of the nymph, occupying the anterior part of the escutcheon, and the surface is covered with fine close-packed pustules which seem to us to be merely low rounded periostracal spicules that do not show any particular alignment. Pleurophorella tricostata (Portlock, 1843) Figs 38a-i 1843 Cypricardia? tricostata Portlock: 441; pi. 34, fig. 17. 1900 Sanguinolites tricostatus Portlock; Hind: 391-3. 71900 Sanguinolites striatogranulatus Hind: 393-4; pi. 42, figs 16-22. Holotype. BGS 14747 (Figs 38a, b). Other material. BM L13446, Carboniferous Limestone, Britain (no further details recorded); BM 22545 and BM L13481, J. Wright Collection, Carboniferous Limestone, Little Island, County
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