454 Memoir Sears Foundation for Marine Research 



Dorsal fin: vertical height 3.2, 3.0; length of base 4.5, 4.0. 

 Pelvics: outer margin 13.4, 14.1. 



Distance: from tip of snout to center of cloaca 52.8, 53.0; from tip of snout to 

 dorsal 57.7, 58.2. 



Figure 105. Aetobatus narinari. A Juvenile male, 530 mm wide, from Bermuda (Harv. Mus. Comp. Zool., 

 No. 1 400). B Part of outer posterior margin of disc of same to show color pattern, about 0.8 X . C Side view of 

 base of tail of same to show dorsal fin and tail spine, about 0.5 x . Z) Cross section of tail of same, at point marked 

 on C by a crossline, about 1.7 X. E Side view of head of another specimen of about the same size, from Main 

 Pass, Louisiana (U. S. Nat. Mus., No. 127296), about 0.3 X . F Lower surface of head of same to show nasal 

 curtain, mouth, and gill region. 



Disc from level of front of spiracles to rear limits of pectorals about 2.1 times as 

 broad as long, lozenge-shaped, with main portion of pectorals originating from sides 

 of head about opposite anterior ends of spiracles; anterior margins at first nearly straight, 

 then increasingly convex outwardly; outer corners narrow with blunted tips; posterior 

 margins concave along outer 2/3 but moderately convex toward broadly rounded poste- 



