THE SKATE. , 63 



extreme right of the figure: the left hypobranchial artery is also 

 displaced outwards; that of the right side (left in the figure) (hy.br) 

 is drawn in situ. 



a.br. I, first, and a.br. 5, last afferent branchial artery : a.co, anterior 

 coronary artery : a.in, anterior innominate artery : b.a, bulbus arterio- 

 sus : br, brachial artery : c, caudal artery : c.a, conus arteriosus : 

 c.c, common carotid artery : fee, coeliac artery : d, duodenal artery : 

 d.ao, dorsal aorta : e.br. I, first, and e.br. 9, last efferent branchial 

 artery : e.c, external carotid artery : f.n, artery to fronto-nasal process : 

 , gastric artery: h, hepatic artery: hy, hyoidean artery: hy.br, 

 hypobranchial artery : /, intestinal artery : i.c, internal carotid artery : 

 il, iliac artery : i.m, inferior mesenteric artery : mn, artery to man- 

 dible : n.br, nutrient arteries of the gills : od, oviducal arteries : p.co, 

 posterior coronary artery : p. in, posterior innominate artery : pn, 

 pancreatic arteries : r, renal arteries : s, artery to snout : s.cl, sub- 

 clavian artery : s.m, superior mesenteric artery : spl, splenic artery : 

 spm, spermatic artery : v, ventricle : v.ao, ventral aorta : vr, vertebral 

 artery. 



140. The inferior jugular vein (Figs. 17 and 21, i.ju) situated in 

 the dorsal wall of the pericardium, near its outer border : it brings 

 blood from the floor of the mouth and pericardial walls, and enters the 

 precaval sinus ( 149, Figs. 17 and 21, pc.s). 



FIG. 21. Raja nasuta. Diagram of the heart and chief blood- 

 vessel-, from the left side (half nat. size). ' 



a.br. i, first, and a.br. 5, last afferent branchial artery : a.co, anterior 

 coronary artery: ail, auricle: br.a, brachial or subclavian artery: 

 br.v, brachial vein : c.a, conus arteriosus : cd, cardinal vein : d.ao, 

 dorsal aorta : e.br. I, first, and e.br. 9, last efferent branchial artery : 

 h.s, hepatic sinus : hy, hyoidean artery : hy.br, hy po -branchial artery : 

 i.ju, inferior jugular vein : ju, jugular vein : n.br, nutrient arteries of 

 the gills: p.co, posterior coronary artery: pc.s, precaval sinus: s.v, 

 sinus venosus : v, ventricle : v.ao, ventral aorta. 



