430 



C. H. DANFORTH 



ep. 4 



OS. PS. 



V. dc. 



Fig. 11 Semi-schematic representation of the coronary artery and neighbor- 

 ing structures. In this specimen the left coronary artery is the one best devel- 

 oped. 



a point which is emphasized by the fact that it sometimes anasto- 

 moses anteriorly with the fourth hypobranchial artery. Presum- 

 ably there is such an anastomosis in the larvae studied by Allis 

 ('11, I.e., p. 283). The main vessel enters the septum trans- 

 versum where branches are given off to the region below the 

 pericardium (a.sp.), to the hver (a.he.a.), and to the heart (a.cn.). 

 The artery which passes into the region ventral to the peri- 

 cardium (fig. 12, a.sp.) sends forward several anterior branches 

 which are chiefly distributed to the mm. pharyngo-claviculares 

 and the posterior part of the sternohyoideus. There is also 

 an anastomosing branch (fig. 12) connecting it with branches 

 of the subclavian artery. The anastomosis is in the position 

 of, and in a measure suggests, the coraco-hypobranchial anasto- 

 mosis of the elasmobranchs as described especially by Pitzorno 



