Ueber die Entwicklung und morphologische Bedeutung der “Pseudobranchie” und ihrer Umgebung bei Lepidosteus osseus

The Development of the Heart and Vascular System of Lepidosiren paradoxa

“…The presence primarily of six aortic arches, of which the tvvo first are incomplete, having no connection with the ventral aortae, may be compared with the early condition described for L e p i d o s t e u s (19). The later development of the four posterior aortic arches, however, with the formation of th& lingual artery and the disappearance of the first and second arches, closely resembles the condition in Urodeles, and the lingual and dorsal carotid vessels of L e p i d o s i r e n are homologous with the external and internal carotids respectively of the former (3).…”