. Bulletin of the British Museum (Natural History), Geology. LOWER CARBONIFEROUS TRILOBITES 213 occipital furrow which is slightly bent forward centrally ; smoothly rounded, narrow (sag.), ip furrows very deep, backwardly directed to join occipital furrow at points 1/3 along its length ; cut off high triangular glabellar lobes. 2p furrows very faint or absent. Axial furrow sharp, separating glabella from almost flat fixed cheek. Glabella reaches forward to touch narrow, smooth, raised anterior rim. Facial suture cuts anterior margin at a point (a) immediately in line (exsag.) with the forward
. Bulletin of the British Museum (Natural History), Geology. LOWER CARBONIFEROUS TRILOBITES 213 occipital furrow which is slightly bent forward centrally ; smoothly rounded, narrow (sag.), ip furrows very deep, backwardly directed to join occipital furrow at points 1/3 along its length ; cut off high triangular glabellar lobes. 2p furrows very faint or absent. Axial furrow sharp, separating glabella from almost flat fixed cheek. Glabella reaches forward to touch narrow, smooth, raised anterior rim. Facial suture cuts anterior margin at a point (a) immediately in line (exsag.) with the forward projection of the sides of glabella at its minimum width, swings outwards sharply to point /? which lies in line (tr.) with the maximum width of the glabella, gently curves round to subparallel, slightly convergent with axial furrow to eye region, which lies in line or immediately posterior of ip furrows. From posterior of. i_ One Centimetre Fig. 1. Phillipsia leei Woodward. Reconstruction. eye ( immediately in front of occipital furrow) swings sharply outwards to cut posterior margin of headshield (<y) a short distance inside angle of genal spine. Thus fixed cheek has sharply pointed triangular extension in occipital region. Eye moderately small, less than \ length of headshield, reniform, multilensed, situated on a raised platform surrounded by a shallow depression. Free cheek gently in- flated, with shallow border furrow and deep pleuroccipital furrow meeting at high angle in genal region. Brim flattened with rounded external margin ; on underside carries fine subparallel longitudinal striae, six or seven laterally, diminishing to 4. 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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