PHYLUM CHORDATA 



325 



the right of the partition arises the pulmonary artery; from the 

 part to the left are given off the right and left aortic arches. 

 When the two auricles contract, the blood from the right 



Fig. 968. — Iiacerta viridis. Dissection from the ventral aspect showing the alimentary, 

 circulatory, respii-atory and urinogenital organs (nat. size). The liver (^r.) is divided longi- 

 tudinally and its two halves displaced outwards ; the alimentary canal is drawn out to the 

 animal's left ; the cloaca with the urinary bladder and posterior ends of the vasa deferentia 

 is removed, aa also is the right adipose body. a. co. anterior cornu of hyo d ; az. azygos or 

 cardinal vein ; 6. hi/, body of hyoid ; c. caudal vein ; c. ad. adipose body ; c. m. coeliaco- 

 mesenteric artery ; c<x. csecum ; cr. carotid artery ; d. ao. dorsal aorta ; du. duodenum ; e. ju. 

 external jugular vein ; ep. epididymis ; epfj. epigastric vein ; /. a. femoral artery ; / v. femoral 

 vein; g. b. gall-bladder; i. jjw. internal jugular vein; il. ileum; i m. inferior mesenteric 

 arteries ; k. kidney ; I. ao. left aortic arch ; I. au. left auricle ; Ig. lungs ; Ir. liver ; in. co. 

 middle cornu of hyoid : p. a. pulmonary artery ; pc. pericardium ; p. co. posterior cornu of 

 hyoid ; pn. jaancreas ; pL pelvic vein ; pt. c. postcaval vein ; pt. v. poi tal vein ; p. v. pulmonary 

 vein ; r. rectum ; r. au. right auricle ; r. k. a. right hepatic artery ; sc. sciatic vein ; scl. a, 

 subclavian artery; scl. v. subclavian vein; sp^ spleen ; st. stomach; s. y. sinus venosrs ; 

 th. thyroid gland ; tr. trachea; U. testis ; v. ventricle. (From Parker's Zootmny.) 



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