. Bulletin of the British Museum (Natural History). CLASSIFICATION OF PLECTAMBONITACEA 81. Fig. 3 Different types of cardinal process within the Plectambonitacea. a, simple, not undercut, projecting posteriorly from hinge line, Ingria nefedyevi (Eichwald), x 10 (after Opik 1932; pi. 6, fig. 32); b, simple, not undercut, not projecting posteriorly from hinge line, Ahtiella baltica Opik, X 6 (after Opik 1933: pi. 4, fig. 6); c, simple, not undercut, Spanodonta hoskingiae Prendergast, x 6 (from BC 10605); d, trifid, not undercut, Toquimia kirki Ulrich & Cooper, x 6 (after Cooper 195
. Bulletin of the British Museum (Natural History). CLASSIFICATION OF PLECTAMBONITACEA 81. Fig. 3 Different types of cardinal process within the Plectambonitacea. a, simple, not undercut, projecting posteriorly from hinge line, Ingria nefedyevi (Eichwald), x 10 (after Opik 1932; pi. 6, fig. 32); b, simple, not undercut, not projecting posteriorly from hinge line, Ahtiella baltica Opik, X 6 (after Opik 1933: pi. 4, fig. 6); c, simple, not undercut, Spanodonta hoskingiae Prendergast, x 6 (from BC 10605); d, trifid, not undercut, Toquimia kirki Ulrich & Cooper, x 6 (after Cooper 1956: pi. 164, fig. 13); e, simple, not undercut, Bimuria superha Cooper, x 6 (from BC 7270); f, simple, not undercut and merging anteriorly with the posterior end of the double septa, Isophragma ricevillense Cooper, x 12 (from BC 7211); g, simple, not undercut, Leplellina tennesseensis Ulrich & Cooper, x 6 (from BB 1228); h, trifid, not undercut, Rurambonites ruralis (Reed), x 6 (from BC 7204); i, trifid, not undercut, Leptelloidea leptelloides (Bekker), x 6 (from B 5169); j, simple, not undercut, Leptella (Petroria) rugosa (Wilson), x 6 (from Cooper 1956: pi. 221, fig. 33).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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