"An across the world disbursed sequence of monographs and memoirs in paleontology and stratigraphy."

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27, fig. 5), which is unlike J. striagena. A second pygidium attributed to J. angustimarginata by Boyce is both coarsely tuberculate and narrower than the holotype and seems likely to belong to another species. In view of these ambiguities, and because we have much better-preserved and abundant material associated from a single horizon, we propose a new species herein, cognisant that its status may be revised when more material is collected from western Newfoundland. FOSSILS AND STRATA 59 (2013) Jeffersonia viator n.

The new material herein generally confirms Boyce’s interpretation. Boyce did not illustrate a free cheek for his stratigraphically early material, but one from the Nordporten Member shows the strong terrace ridges that, unusually, pass obliquely across the pleural field and straight on to the rounded border (Fig. 7B, H). The same feature is seen on the free cheek of the younger specimen from the Catoche Formation figured by Fortey (1979, pl. 26, fig. 9). Terrace ridges are somewhat finer on the latter than the former.

Fig. 12. A–B, D–K, N–S, X–Y, Jeffersonia viator n. sp. All top 2 m of Bassisletta Member, Chapmanopyge fauna, except P, which is 34 m below the top of the Bassisletta Member, and I–J and Y that are low Nordporten Member, P. groenlandicus fauna ca. 50 m. 216 in dorsal view (x7). 218 in dorsal view (x5) and in lateral view to show sculpture (x6). 202 in dorsal, anterior and lateral views (x4). 76 in dorsal and anterior views (x6), low Nordporten Member ca. 50 m. 201 in dorsal (N x6) and posterior views (O x4).

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Fossils and strata

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