. Bulletin of the British Museum (Natural History). CLASSIFICATION OF PLECTAMBONITACEA 115. Fig. 70 Bilobia musca (Opik, 1930), from Kukruse Formation (L. Caradoc), Kohtla-Jarvc, Estonia, USSR, posterior, exterior and views of brachial valve, topotype. BB 5202, x 7 (70a) and x 5 (70b, c). Fig. 71 Bilobia hemisphaerica Cooper, 1956, paratypc from Oranda Formation (L. Caradoc). Guilford Springs, 2-5 miles SW of Chambcrsburg, Pennsylvania, USA. internal mould of brachial valve, the original of Cooper 1956: pi. 193. figs 34. 35. USNM 111087c, x 5. Fig. 72 Lcatigella (LeungcUa)
. Bulletin of the British Museum (Natural History). CLASSIFICATION OF PLECTAMBONITACEA 115. Fig. 70 Bilobia musca (Opik, 1930), from Kukruse Formation (L. Caradoc), Kohtla-Jarvc, Estonia, USSR, posterior, exterior and views of brachial valve, topotype. BB 5202, x 7 (70a) and x 5 (70b, c). Fig. 71 Bilobia hemisphaerica Cooper, 1956, paratypc from Oranda Formation (L. Caradoc). Guilford Springs, 2-5 miles SW of Chambcrsburg, Pennsylvania, USA. internal mould of brachial valve, the original of Cooper 1956: pi. 193. figs 34. 35. USNM 111087c, x 5. Fig. 72 Lcatigella (LeungcUa) gibhosu (Winchell & Schuchert. 1892). from Stewartville I-ormation (L. Ashgill), between Stewartville and Chatville, Minnesota, USA, silicified interior of brachial valve. BC 7272. x 5. Fig. 73 Lcangella (Leangella) scissa (Davidson. 1871), topotype from U. Havcrford Mudstone Formation (L. Llandovery). Gasworks, Haverfordwest, Dyfed, Wales, natural internal mould and downwards and posterior views of latex cast of brachial valve. BB 32167. x 6. Figs 74-76 Leangella (Leangella) tufogena (Havh'Cek. 1961). topotypcs from Liten Formation (U. Wcnlock). Hlinik. Svaly Jan Pod Skalou. Bohemia, Czechoslovakia. Fig. 74. natural internal mould of brachial valve. BB 71535, X 8; Fig. 75, natural internal mould of pedicle valve, BB 71530, x 6; Fig. 76. natural internal mould of pedicle valve viewed obliquely from the posterior. BB 71536, x 8. species, this platform is not developed so strongly and its function is less certain. There is some variation in the median septum in the brachial valve - this is usually a double septum, sometimes a single septum and in some specimens no septum at all can be seen. Likewise the median septum in the pedicle valve is also variably developed; ui some populations ( that figured in Mitchell U)77: pi. 15) the septum is present in some specimens anil absent ni others, and for this reason \vc I. Please note that these images are extracted from scanned pa
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