Stegostoma, 67 
elliptical, much larger than eye, just behind it; snout rather short, its upper profile 
strongly curved. Mouth inferior, large, with a nearly straight cleft ; its corner nearer 
to tip of snout than to anterior rim of eye, with a distinct labial fold. Upper lip very 
thick, like a quadrangular pad, with a barbel on either side, one-twelfth as long as the 
head as measured from tip of snout to first gill-opening ; teeth in both jaws equal, 
small, tricuspid, in several rows, about twenty-two teeth in a row visible from outside ; 
nostrils confluent with buccal cavity. Gill-openings five in number, last two close to- 
gether, third one widest, 4; in head as measured from tip of snout to first gill-opening. 
Two dorsals, spineless, small, unequal, but similar in shape; first dorsal inserted 
before the insertion of ventral; second dorsal much smaller than the first dorsal, 
entirely before ana] ; anal rather small, inserted slightly behind posterior end of base 
of second dorsal; pectoral large, inserted between second and third gill-openings, 
posterior margin truncate ; ventral below posterior part of first dorsal, and the posterior 
end of the base behind that of base of first dorsal ; caudal very long, upper lobe little 
developed on the dorsal side but the lower greatly developed, separated from upper 
by a notch; also a small notch at tip of caudal fin. Body roughened with small 
scales ; scales on longitudinal ridges slightly larger ; those on each side of the upper 
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