BLOOD-VASCULAB SYSTEM OF THE TILE-FISH. 



'.17 



which extends dorsad, craniad, and laterad. This vessel ( 17), the " muscular branch " 

 of many writers, has been called by Allis (1897), in his description of Amia, the 

 a. byoQpercularis. About 1 cm. from its point of origin the a. hyoQpercularis (17) 

 passes through the facial foramen and then divides into three main branches. 



Fig. '.'. — Cranial portion of arterial system in the tomcod {Microgad Ventral aspect, 



X 2. The first efferent branchial and hyoidean arteries of the right side are reflected bo as ti» 

 bring them into one plane. 



The largest of these three branches runs craniad and ventrad below the orbit for 

 about 1 cm., sends a small branch to the m. adductor hyomandibularis, and then divides 

 into two branches; the larger (19) runs craniad and supplies the inner or deep division 

 of them, adductor mandibular the smaller (-'") running ventrad and slightly laterad for 

 about 18 mm., in a groove wiiich crosses the metapterygoid, joins the hyoidean artery, 



B. B. F. 100 1—7 



