1914.] 



NATURAL SCIENCES OF PHILADELPHIA. 



425 



t, thoracic vein. 

 tS thoracic artery, 

 tb, tibial artery, 

 th, thyroid artery, 

 tr, tracheal vein. 



u, 1-4, urogenital arteries (numbers 



on right side of figure), 

 ul', ulnar artery. 



V, vertebral vein. 

 vS vertebral artery. 



vca, anterior vena cava, 

 vh, hepatic vein. 



vpd, vps, right and left pulmonary 

 veins. 



X, x^, connectives between coUateralis 

 colli and carotid. 



y, artery to shoulder and skin. 



z, z', Z-, branches of common carotid. 

 IS 2', 3', branches of ischiadiac artery . 



Explanation of Plate XIII. 



For lettering to all figures see above. 



Fig. 1. — The veins of the posterior region of the Florida alligator. The post- 

 caval system and its associated veins are shown in the main figure; the 

 hepatic portal system is shown in the smaller figure to the left. 



Fig. 2. — The veins of the anterior region of the Florida alligator. The veins 

 of the left foreleg are shown at A. 



Fig. 3. — The arteries of the posterior region of the Florida alligator. 



Fig. 4. — The arteries of the anterior region of the Florida alligator. The arteries 

 of the left foreleg shown at A. 



