Jones, Development of the Sympathetic. 



127 



Fig. g. — Diagrammatic reconstruction 

 of the sympathetic nervous system of 

 a I4 mm. toad, i^i'., ramus communi- 

 cans ; dotted line lettered 7?., ramus only 

 partially developed. Other abbreviations, 

 same as in Fig's. 7 and 8. X 28. 



Fig. 10. — Diagrammatic reconstruc- 

 tion of the sympathetic nervous sys- 

 tem of an 18.5 mm. toad. The ridge, 

 Ri., which is figured as extending 

 inward horizontally throughout its 

 entire extent has, in the actual speci- 

 men, an upward and inward d\x&c^\oxi 

 anteriorly (see Fig. 5, Ri.) and an 

 upward and outward direction poste- 

 riorly (see Fig. 6, Ri.). Reference 

 marks, same as in Fig's. 7, 8, and 9. 

 X 24. 



