. Bulletin of the British Museum (Natural History), Geology. THE HEAD OF DIPTERUS VALENCIENNESI 19 develop and its space has been largely taken by K, but the lateral line has been largely captured by Y^. The L plate is also shown as a compound 1^^ + Lg, but this has a single centre and seems to be composed of L^ only which has taken over the territory of a missing Lj. The pores in the very small head illustrated in Text-fig. 41 () seem to indicate a similar situation in regard to the XK area, and here also the area of M has apparently been taken over by Lj. The capture of the infraorbit
. Bulletin of the British Museum (Natural History), Geology. THE HEAD OF DIPTERUS VALENCIENNESI 19 develop and its space has been largely taken by K, but the lateral line has been largely captured by Y^. The L plate is also shown as a compound 1^^ + Lg, but this has a single centre and seems to be composed of L^ only which has taken over the territory of a missing Lj. The pores in the very small head illustrated in Text-fig. 41 () seem to indicate a similar situation in regard to the XK area, and here also the area of M has apparently been taken over by Lj. The capture of the infraorbital curve by Y^, is e^'en more clearly demonstrated in Text-fig. 21 in a very abnormal short-headed fossil from Achanarras (P. 17642, Fig. 20. Dipterus valenciennesi S. & M. Left side of skull-roof and cheek of original of Westoll's standard specimen (see Graham-Smith & Westoll 1937 • 244, text-fig. la ; Westoll 1949 : 126, text-figs. lA, C) with sensory canals partly dissected out and plates partly re-lettered. Achanarras, Caithness. 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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