PHYLUM CHORD ATA 



303 



veins open, is thin walled, and has a smooth inner surface. From 

 it a sinu-auricular aperture, guarded by a two-lipped valve, leads 



a. d.V 







FIG. 913. Lacerta 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. hy. body of hyoid ; c. caudal vein ; c. ad. adipose body ; c. ra. cceliaco- 

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

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

 vein ; g. b. gall-bladder ; i. ju. 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 ; 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. post-caval vein ; pt. v. portal vein ; p. v. pulmonary 

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

 sub-clavian artery ; scl. v. sub-clavian vein ; spl. spleen : st. stomach ; s. v. sinus venosus ; 

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



