SO Etmopterus. 
the posterior oval. Mouth but slightly arched, its angle behind eye, and midway 
between tip of snout and root of pectoral, but anterior end of upper lip on vertical 
midway between posterior rim of pupil and posterior margin of eye. Lips rather 
thin ; a long, deep, straight, oblique groove on each side of mouth, the groove on the 
upper lip being two-thirds as long as that on the lower. Teeth in upper jaw erect, 
tricuspidate, about twenty four in a row, those in lower jaw oblique, their points so 
much turned aside that the inner margin forms the cutting edge. Two dorsals each 
with a spine in front ; the spine of first dorsal very small, only reaching up to less than 
half the height of the anterior margin of soft part of the fin; its soft part smal], similar in 
shape to the adipose fin of the lizard fishes (Syodontid@), its dorsal margin very broadly 
rounded; second dorsal much larger than the first, its spine much larger and longer 
than that of the first dorsal, but much shorter than the length of the anterior margin of 
the second dorsal ; soft part of the second dorsal strongly emarginate in dorsal margin, 
its posterior part elongated ; no anal; pectoral small, low, its posterior margin emar- 
ginate ; ventral entirely before the second dorsal; caudal well developed, its lower lobe 
continuous with lower part of the upper, with a very slight notch between. Skin with 


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