268 



THE BIOLOGY OF THE FROG 



CHAP. 



c.il -i 



4 ** f- 



sc 



FlG. 74. Diagram of the arterial system of the 

 frog, seen from the ventral side, ao" , aortic 

 arch; au' ', right auricle; au", left auricle; br, 

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

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

 enteric; cos', coeliac; cti, cutaneous; d.ao, 

 dorsal aorta ; /m, femoral ; g t gastric ; //, 

 haemorrhoidal ; hp, hepatic ; hy, epigastrico- 

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

 in, anterior mesenteric ; tn.i, posterior mesen- 

 teric; oc, occipital; pc' , pancreatic; p.cu, 

 pulmo-cutaneous; put, pulmonary; re, renal; 

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

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



divided by twd 

 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 I 



