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PHYLUM CHORDATA 



315 



the corresponding aortic arch, with which it anastomoses distally 

 (the connecting part being termed the ductus Botalli), having 

 previously given off the carotid artery proper, by means of which 



ft. CO 



m.co 



l.att. 



FIG. 979. Iiacerta viridis. Dissection from the ventral aspect showing the alimentary 

 circulatory, respiratory and urinogenital organs (nat. size). The liver (Ir.) 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, as also is the right adipose body. a. co. anterior cornu of hyoid ; az. azygos or 

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

 mesenteric artery ; cce. crecum ; cr. carotid artery ; d. ao. dorsal aorta ; du. duodenum ; e. ju. 

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

 vein ; g. b. gall-bladder ; i. ju. internal jugular vein ; il. ileum ; i. m. posterior mesenteric 

 arteries ; k. kidney ; la. o. left aortic arch ; 1. au. left auricle ; Ig. lungs ; Ir. liver ; m. co. 

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

 hyoid ; pn. pancreas ; pi. pelvic vein ; pt. c. postcaval vein ; ft. r. hepatic portal vein ; p. v. 

 pulmonary vein ; r. rectum ; r. au. right auricle ; r.h.a. right hepal ic artery ; sc. sciatic vein ; 

 set. a. subclavian artery ;scl. v. subclavian vein ; spl. spleen ; st. stomach ; s. v. sinus venosus 

 (/;. thyroid gland; tr. trachea ; t. testis r. ventricle. (From Parker's Zootomy.) 



