THE KING CRAB 



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£fa.77r. 



Pm^/^ 



Fig. 212. — Diagram of the ventral surface of the same King- 

 Crab, showing the six legs, the genital operculum (Op) 

 and the branchial plates (Br. app.). Sfr, sub -frontal 

 piece ; Cam, upper lip or camerostome ; M, mouth ; 

 Pmst, anterior sternal plate ; Chi, the chilaria, which are 

 the same parts as are seen in the pentagonal sternmn of 

 the Scorf)ion (Fig. 206, met) and in the oval plate of 

 Pterygotus (Fig. 207, m). 



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