EXPLANATION OF PLATE XVIII. 
SKULL oF EIGENMANNIA VIRESCENS (Valenciennes). 
Fig. 1, dorsal view; Fig. 2, lateral view. par., parietal; pter., pterotic; fr., frontal; nas., nasal; pmz., 
premaxillary; exo., exoccipital; spe., sphenotic; b. occ., basioccipital; 1st. s. 0., first suborbital; 2d s. 0., second 
suborbital; 3rd s. o., third suborbital; maz., maxillary; man., mandible; pr. op., preoperculum; in. op., 
interoperculum; s. op., suboperculum; op., operculum; m. pt., metapterygoid; hy. m., hyomandibular. 
202 
