PLATE XLVl. 



Class AMPHIBIA continued 

 THE FROG continued. 



FIG. 1. HEART AND ARTERIAL SYSTEM, x 2. 



. a , a. 2 right and left auricles constituting the atrium: ve. ventricle : 



t. truncus arteriosus. 

 p. pulmo-cutaneous arch: p. a. pulmonary artery : c. a. cutaneous 



artery. 

 s. systemic arch : v. occipito-vertebral artery : s. a. subclavian artery : 



c.m. coeliaco-mesenteric artery : cl. cceliac artery : s. m. 



(superior) mesenteric artery : d. dorsal aorta : sp. spermatic 



artery to ts. testis : r. renal arteries to k. kidney : i. iliac artery ^ 

 c. carotid arch : y. carotid gland : I. lingual artery : cr. common 



carotid artery. 



FIG. 2. BLOOD : NUCLEATED CORPUSCLES, x 300. 



FIG. 3. DIAGRAM OF THE HEART. 



/ r. right auricle : /. left auricle : v. ventricle : t. truncus arteriosus. 

 The dotted arrow shows the communication between the 

 right side and the pulmo-cutaneous arches, the plain arrow 

 between the left side and the two other pairs of arches. 



FIG. 4. DISSECTION OF THE HEART FROM THE VENTRAL ASPECT. (From 



r 



Howes.) x 6. 



a. 1 right auricle with the opening from the sinus venosus : a. 2 left 

 auricle with the opening of the pulmonary vein : ve. ventricle : 

 p. pylangium with opening into pulmo-cutaneous trunks : 

 v. valve : 5. synaugium : c. carotid arch : sy. systemic arch :. 

 p.c. pulmo-cutaneous arch. 



