. Bulletin of the British Museum (Natural History). 230 p. H. GREENWOOD derived from the prootic, but it is completed dorsally by the pterosphenoid (see p. 224); the lateral commissure is described above. The orbital artery does not have a separate foramen but passes into the pars jugularis through its posterior opening (as in clupeoids). However, unlike the condition found in clupeoids, there is no distinct foramen for the hyomandibular branch of VII. This branch shares the posterior opening with the head vein and the orbital artery. In this respect the pars jugularis of Denticeps clupeoides
. Bulletin of the British Museum (Natural History). 230 p. H. GREENWOOD derived from the prootic, but it is completed dorsally by the pterosphenoid (see p. 224); the lateral commissure is described above. The orbital artery does not have a separate foramen but passes into the pars jugularis through its posterior opening (as in clupeoids). However, unlike the condition found in clupeoids, there is no distinct foramen for the hyomandibular branch of VII. This branch shares the posterior opening with the head vein and the orbital artery. In this respect the pars jugularis of Denticeps clupeoides resembles that of perciform fishes {see Patter- son, 1964). The pars ganglionaris of the chamber is a narrow shelf projecting from the inner prootic face immediately medial to the pars jugularis. Like the prootic, the pterotic is intimately associated with its bulla, and the two bones cannot be separated readily (Text-figs. 6 and 11). The pterotic, however, sheathes only the lateral and posterolateral aspects of the bulla. In adult animals it is impossible to distinguish between dermal and endochondral pterotic elements since only a single sheet of bone is present. The situation is further complicated when, as in this case, a recessus lateralis is developed and in consequence the latero- sensory canal lies medial to the bone and not superficially on any part of 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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