FIG. 34 in The anatomy of Euphanerops longaevus Woodward, 1900, an anaspid-like jawless vertebrate from the Upper Devonian of Miguasha, Quebec, Canada

FIG. 34. — Euphanerops longaevus Woodward, 1900; Escuminac Formation, lower Frasnian (Upper Devonian), Miguasha, Quebec, Canada; specimen MHNM 01-02A: photograph in immersion in alcohol (A) and camera lucida drawing (B1) of the posterior part of the branchial apparatus and the overlying structure (framed in C), regarded by Arsenault & Janvier (1991) as the possible imprint of the heart; B2, detail drawing of the elongated black grains, which suggest that this structure may rather be either gut contents, or "diffuse mineralized matter". Scale bars: A, B1, 1 mm; B2, 0.1 mm.