902 THE AMERICAN NATURALIST. (VoL. XXXIX. 











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Fi. 6.— Dorsal view of Raia, more deeply dissected on the left. 45 2, adductor mandibu- 
laris lateralis (superficial layer, posterior); 4» 2a same, superficial layer, anterior; Csd 
tores su rsales; F 7-4, fascie; WM, hyomandibula; ZH m, levator 
hyomandibularis ; Zs 5; levatores labialis superioris Li, lev: lz inferioris 
Lms, levator maxillz superioris ; Zr, lev. tri t ius. 
