153 



tlie motion of tlie neck-root joint completes hi-corn- 

 posiie spine anteriorly for the right posterior winding 

 line, excepting the formation throughout of h', h'^y 

 b'^, its primary sections, which await the release of 

 the posterior cross-line end from its position to the 

 left, on the formation of the alternate anterior line. 



Right anterior lung lobe and lung tip straighten 

 into one. The sternal action would connect the 

 right fore-leg mth the right digastric, but for the 

 same reason (§ 39) that the action of the right head- 

 socket only gives pressure on the left; this only 

 causes accumulated action in the left digastric. 



DiscHAEGE. Sy the formation of the right (al- 

 ternate) anterior line. 



A' a^ a'*. Gives final discharge to the ophidian 

 S so soon as a'* draws the anterior end of the alter- 

 nate ophidian cross-Hne to the right, thus releasing 

 the end of the old line. 



A' a'2, moving the anterior end of the alternate 

 composite spine cross-line, after fully discharging 

 the left hind-foot by releasing the "reactionary," 

 and the right fore-foot by releasing the "direct" 

 action of the secondary section of the old posterior 

 line, sets down the free right hind-foot by the re~ 

 lease of the old posterior cross-line end of the com- 

 posite spine. A' a'^ Hkewise frees the left digas- 



