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blade the shape of the rear true ribs of its side. 

 The right Jiind-foot is turned in by the facing of its 

 socket. 



The right eye becomes the centre of direction, 

 the muscular portion in front of the loop rolling 

 outward, and thus the ophidian spine preserves, in 

 the eye, its relation to the snake's motion. 



a '^ Formation of the primary section — Upper 

 end of sternum carried somewhat to left, brings 

 bearing of right shoulder blade on the ribs, nearer 

 to its socket part — Displaces ophidian cross line to 

 left — Eear portion of right eye muscle rolls out- 

 ward, loop slipping to its rear limit — Enlarges right 

 upper lung lobe. 



a^ This movement combines the third S with 

 the ophidian spine, and thus forms the rear portion 

 of the composite spine for the anterior winding- 

 line. As the internal relations of the composite 

 spine belong to the ophidian S, and the external to 

 the neck S, the anterior "point of application" for a^ 

 a ''^ must vary between the " point in a cross plane" 

 spoken of under a ^ and the head condyles — Turns 

 the left hind-foot still more on its outer bearing — 

 Fills the rear C of the right lung tip (in filling 

 this, revolves to the left and backward)— Tightens 

 connection between left side of pubis and left side 



