. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 220 basioccipital opens, transmitting the lateral dorsal aorta; while in my larval specimen the aortal canal opens immediately posterior to the canal in the ascending process of the parasphenoid. Running forward in this canal in the parasphenoid, and accompanied by a lymph vessel and a small nerve, doubtless sympathetic, as Pollard has suggested, the carotid reaches the anterior edge of the ascending process of the parasphenoid and there passes ventral to the trigeminus portion of a perfectly typical trigemino-facialis chambe
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 220 basioccipital opens, transmitting the lateral dorsal aorta; while in my larval specimen the aortal canal opens immediately posterior to the canal in the ascending process of the parasphenoid. Running forward in this canal in the parasphenoid, and accompanied by a lymph vessel and a small nerve, doubtless sympathetic, as Pollard has suggested, the carotid reaches the anterior edge of the ascending process of the parasphenoid and there passes ventral to the trigeminus portion of a perfectly typical trigemino-facialis chamber. This trigeminus portion of the chamber lies in an excavation on the outer surface of the chondrocranium, but the chamber is continued posteriorly, as far as the foramen for the radix facialis, by a closed canal in the cartilagi- nous wall of the cranium, and then, beyond that point, to the opening. Diagrammatic representation of the prebranchial arteries in Polypterus senegalus. 7, II First and second branchial arches, ahy afferent hyoideau artery. eJiy efferent hyoidean artery, emd efferent mandibular artery, ec external carotid artery, ic internal carotid artery, cer cerebral artery, on orbito-nasal artery, da dorsal aorta. that Traquair describes as the exit of the facial nerve, by a canal that lies between the excavated side wall of the chondrocranium and the ascending process of the parasphenoid. When the carotid, running forward, reaches the hind edge of the trigeminus portion of this tri- gemino-facialis chamber, it separates into its external and internal branches. The external carotid runs upward into the trigemino-facialis chamber. The internal carotid remains below in the canal in the para- sphenoid, where it is joined by a branch of the jugular vein which comes down from the trigemino-facialis chamber, and by a nerve which is doubtless the palatinus facialis, as Pollard has stated, though I have not as yet attempted to identify it. The branch of the jugular. Plea
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