480 



University of California Publications in Zoology \yoi.. 18 



Method 



For this study the body was transected two to four inches back of 



the pectoral fins, and the anterior segment then cut in sagittal plane 



from the tip of the nose to the place of severance of the body. By the 



latter cut, right or left halves of the head and pectoral regions may be 



rig. 1. The subclavian vein and its relations, Heptanchus maculatus, lateral 



Fig. 2. The subclavian vein and its relations, Squalus sucTclii, lateral view, 

 br. v., brachial vein; co. v., coracoid vein; d. c, duet of Cuvier; I. a. v., lateral 

 abdominal vein; I.e. v., lateral cutaneous vein; -p.c.s., postcardinal sinus; s.cl.v., 

 subclavian vein; s.sc.v., subscapular vein. 



