116 



In the first place it should be stated that what MtJLLER says in the 

 work referred to by Maurer is (Müller, 1839, p. 221): "Die arteria 

 hyoidea entspringt aus dem Bauchende der ersten Kiemenvene, durch- 

 bohrt oft zuerst das untere Ende des Zungenbeins wie bei den Cypri- 

 nus, Gad US u. a., folgt dem obern Rande des Zungenbeinbogens, Äste 

 an das Zungenbein und die Kiemendecken abgebend, kömmt dann 

 am untern Rande des os temporale, das Suspensorium des Unterkiefers 

 durchbohrend, an der Innern Seite des Kiemendeckels zum Vorschein, 

 und geht nach Abgabe einiger Zweige zur Haut an der Innenseite 



lc(a 



aeW 



Fig. 2. Diagrammatic representation of the arteries shown in Fig. 1. 



des Kiemendeckels direkt zum vordem Rande der Nebenkieme." And 

 this clear and concise statement does not necessarily mean, as Maurer 

 states, that the artery perforates the hyomandibular, Müller's os tem- 

 porale, for the suspensorial apparatus of teleosts includes the palato- 

 quadrate and symplectic as well as the hyomandibular. 



What Hyrtl may say regarding the course of this artery, in the 

 work referred to by Maurer, I do not know, not having been able 

 to consult that particular work. 



Turning now to Esox lucius (Fig. 1 and 2), I find the afferent 

 arteries to the first and second branchial arches arising independently 

 from the truncus arteriosus, while the arteries to the third and fourth 



