PLATE XXIX - , 



Plate XXIX represents a projection of the same 

 structures upon the posterior surface of the body, also 

 reduced to one-half life size. The body outline was 

 obtained in the same way as in Plate XXVIII. The section 

 lines correspond to those in Plate XXVII and were located 

 in the same way as those in Plate XXVIII. The positions 

 of the section lines are not exactly the same in this plate as 

 in Plate XXVIII since many of the sections differ in thick- 

 ness at their anterior and posterior surfaces. 



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