268 



THE BIOLOGY OF THE FROG 



CHAP. 



Fig. 74. — Diagram of the arterial system of the 

 fiog, seen trom the vential side, ao" , aortic 

 arch; an', right auricle ; ati" , left auricle ; br, 

 brachial artery; c.c, carotid; c.gl, carotid 

 gland; c.il, common iliac; ccs, cceliaco-mes- 

 enteric; c(£' , coeliac; cu, cutaneous; d.ao, 

 dorsal aorta ; fin, femoral ; g, gastric ; h, 

 hsemorrhoidal ; hp, hepatic ; hy, epigastrico- 

 vesical ; k, kidney; /, lingual; /^", left lung; 

 m, anterior mesenteric; w./, posterior mesen- 

 teric; oc, occipital; /t', pancreatic ; p.cu, 

 pulmo-cutaneous; /«/, pulmonary; re, renal; 

 sc, sciatic ; sp, splenic ; tr.a, truncus arterio- 

 sus ; is, testis ; v, vertebral. (After Howes.) 



divided by two 

 septa into three 

 compartments. The 

 anterior compart- 

 ments, which lead 

 to the common 

 carotid arteries, 

 both enter the un- 

 paired division of 

 the truncus to the 

 right of the septum. 

 The middle com- 

 partments, which 

 lead to the aorta, 

 open into the un- 

 paired portion of 

 the truncus on 

 either side of the 

 septum. 



The posterior 

 compartments, 

 which are con- 

 tinued into the 

 pulmo-cutaneous 

 arches, join each 

 other and open by 

 a common aperture 

 into the bulbus 

 cordis behind the 

 valves at its ante- 

 rior end. 



The Arteries. — 

 The arteries, o r 



