EXPLANATION OF PLATE XVI. 
SkuLL oF GYMNOTUS CARAPO Linnzus. 
Fig. 1, dorsal view; Fig. 2, lateral view. ang., angulare; art., articulare; 6. occ., basi-occipital; den., 
dentary; ex. o., exoccipital; fr., frontal; h. mn., hyomandibular; in. op., interoperculum; msth., mesethmoid; 
mex., maxillary; nas., nasal; op., operculum; or. sph., orbitosphenoid; par., parietal; p. m., premaxillary; 
pr. op., preoperculum; p. ‘sph., parasphenoid; pter., pterotic; pig., pterygoid; qu., quadrate; s. occ., supra- 
occipital; s. op., suboperculum; sph., sphenotic; sw. scap., supraseapular; sym., symplectic. 
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