. Bulletin of the Natural Histort Museum. Geology series. 32 CHARIG AND MILNER is one pair of pleurocoels, again as in the other cervicals. The parapophyses, though present, do not project laterally, and the diapophyses are reduced to small pyramidal tubercles. The neural spine possesses the hatchet-like shape typical of many reptilian axes; the epipophyses are very prominent, and a distinct hyposphene is present. According to Madsen (1976: 32), in Allosaurus the distance from the prezygapophyses to the postzygapophyses, relative to the width, is greater in the anterior cervicals, su
. Bulletin of the Natural Histort Museum. Geology series. 32 CHARIG AND MILNER is one pair of pleurocoels, again as in the other cervicals. The parapophyses, though present, do not project laterally, and the diapophyses are reduced to small pyramidal tubercles. The neural spine possesses the hatchet-like shape typical of many reptilian axes; the epipophyses are very prominent, and a distinct hyposphene is present. According to Madsen (1976: 32), in Allosaurus the distance from the prezygapophyses to the postzygapophyses, relative to the width, is greater in the anterior cervicals, subequal in the mid-cervicals, and less in the posterior cervicals. In Baryonyx, the exact opposite obtains (see Table 1, p. 30). Madsen also noted {loc. cit.) that in Allosaurus the epipophyses are long in the anterior part of the series but decrease progressively backwards to only a small ridge in Ce9. The same applies to 5(«ra/??or(Currie&Zhao 1993: 2056). InBaryo«. are well-developed throughout the series; the longest of all are in Ce8, but those (though still well-developed) are less robust than the epipophyses of the more anterior vertebrae. Dorsal region (Figs 22-26). The material available contains all or part of at least twelve dorsal vertebrae: seven preserved fairly complete, three centra lacking a neural arch (but one with a prezygapophysis and diapophysis) and two neural arches lacking a centrum. Like the cervicals, they were not found in articulation and have been ordered on their various morphological trends. If we assume that the total dorsal count was the usual theropod number, fourteen (making twenty-three presacrals altogether), then the verte- brae preserved seem to be: Dl, D2, D3, D4 (centrum, left prezygapophysis and diapophysis only), D5, D6, D7 (neural arch diameter only), D8 (centrum only), [D9 missing entirely], DIO (neural arch only), Dll, [D12 missing entirely], D13 (centrum only), D14. Additionally, there are other vertebral fra
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