896 THE AMERICAN NATURALIST. (VoL. XXXIX, 
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FıG. 3.— Ventral view of Raia, the right half 4 deeper dissection than the left. Aml 7, 2, 
dd libularis lateralis (superficial layer, posterior) ; A m? 22, adductor mandibu- 
laris lateralis (superficial layer anterior); Anm, adductor mandibularis medialis ; Cac, cor- 
aco-arcualis communis; CBr, coraco-branchialis ; CZ», coraco-hyomandibularis; CZy, 
coraco-hyoideus ; Cw, coraco-mandibularis ; Csv 7-7, constrictores superiores ventrales ; 
DH m, depressor hyomandibularis; Dir, depressor mandibularis; /#tbr 7-4, interbran- 
chiales; Z/s 7-4, levatores labialis superioris; Zs, levator maxille superioris. 

