Fig. 17. — Raja nasuta. The venous system, ventral aspect (one- 

 third nat. size). 



The portal vein is not shown ; the renal portal vein (r./) is supposed 

 to be removed on the right side (left in the figure), and the femoral 

 (/m), ilio-haemorrhoidal {i/.A), &c., veins as well as part of the car- 

 dinal [cd] on the left. The right precaval sinus {^c.s) is cut open, 

 so as to show the apertures in its walls. The outlines of those pnriions 

 of the auricle {au) and sinus venosus {s.v) which lie behind (dorsal 

 to) the ventricle {v\ are dotted. 



ai, veins from abdominal walls : au, aurie'e : d.a, bulbus anteriofus : 

 ir, brachial vein : <-, caudal vein : c.a, conus arteriosus : cd, cardinal 

 vein : cd.', posterior anastomosis of cardinal veins : cd.s, cai-dinal sinus : 

 e/i^, epigastric vein : fm, femoral vein : A.s, hepatic sinus : Acs, haemor- 

 rhoidal veins : i/.&, ilio-hsemorrhoidal vein : i.ju, inferior jugular 

 vein : Ju, jugular vein ; /y, opening of lymphatic trunk into precaval 

 sinus : ^c.s, precaval sinus : r./i, renal portal vein : r.p', factors of 

 renal portal vein from pelvic and lumbar regions : r.p", branches of 

 renal portal veins entering kidney;- sfi.s, spermatic sinus: s.v, sinus 

 venoms : v, ventricle. 



