. The annals and magazine of natural history : zoology, botany, and geology. J -m.pra.r.. Pectoral 1 in of Ivsthenopteron, British Mii.«eiim specimen P. 6790.Nat. size. , fleitlirum ; cose, the possible coraco-scapula; l.a.rf.., the hrst axonostor the basal; ^.rt,?i., second axonost; 5. cm/., third axonost; Jf.axt.,fourth axonost; I.pra.r., first preaxial radial; Il.pra.r., secondprf^axial radial; Ill.prn.r., third preaxial radial; pa.pr., postaxialprocess ; dermal rays are represented by lines. Pectoral Fin q/Eustlienopteron. 473 Finally, the £onvlli piece of the axi.s is .somewhat con-strict
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. The annals and magazine of natural history : zoology, botany, and geology. J -m.pra.r.. Pectoral 1 in of Ivsthenopteron, British Mii.«eiim specimen P. 6790.Nat. size. , fleitlirum ; cose, the possible coraco-scapula; l.a.rf.., the hrst axonostor the basal; ^.rt, ?i., second axonost; 5. cm/., third axonost; Jf.axt., fourth axonost; I.pra.r., first preaxial radial; Il.pra.r., secondprf^axial radial; Ill.prn.r., third preaxial radial; pa.pr., postaxialprocess ; dermal rays are represented by lines. Pectoral Fin q/Eustlienopteron. 473 Finally, the £onvlli piece of the axi.s is .somewhat con-stricted in the middle, and quite distinctly bifurcated poste-riorly (a feature not marked in tlie figure of A. S. Woodward, J8C8). When looked at with a magnifying-glass, these twoposterior blanches seem to continue in two separate ossifica-tions, so that the composition of this fourth axonost of twoseparate parts is not improbal)le, ahliough not to be affirmedwith certainty, the separating line between the two beingperhaps due to a crack. One sees also with the magnifying-glass the clear