PLATES. 



EXPLANATION OF FIGURES, 

 ao. Aorta, 

 as. Aortal support, 

 cu. ch. Inner notochordal sheath. 

 e. ex. External elastica. 

 h. a. Haemal arch. 



i. c. Cartilage intercalated between halves of upper arch above the spinal cord. 

 1. 1. s. Superior longitudinal ligament, 

 n. Nerve. 



n. a. Half of neural arch, 

 not. Notochord. 



n, s. Distal extremity of lateral half of neural arch, 

 par. Parapophysis. 



p. c Cartilage supporting lateral half of neural arch (pleurocentrum.) 

 r. Rib. 



s. n. Spinal nerve, 

 sp. c. Spinal cord, 

 sp. s. Spinal ganglion, 

 v. Vein. 

 In the colored figures cartilage is represented by blue, bone by red. 



