100 Chasmichthys. 
orbital broad, very gently convex; snout moderate in length, its profile moderately 
steep, nearly straight, pointed when viewed from side, but rather broadly rounded when 
‘viewed from above ; anterior nostril near anterior edge of preorbital, with a short tube ; 
posterior one slightly elevated, almost midway between anterior edge of preorbital 
and anterior rim of eye. Mouth wide, slightly oblique ; lower jaw included ; maxillary 
exposed distally, with slightly widened posterior end; upper lip thin and wide. Teeth 
in jaws minute, simple, pointed, in narrow band slightly widened mesially ; the teeth 
extending backward in the upper jaw to beneath anterior rim of eye, but terminating in 
the lower much more anteriorly. Tongue free anteriorly, slightly notched at tip. 
Gill-openings lateral, almost vertical, joined to broad isthmus, whose width is contained 
: 2% in head; width of isthmus 22 in head; gill-rakers on first gill-arch 4+11, short, 
oblong, pointed ; pseudobranchize developed. Two dorsals well separated ; first dorsal 
with scalloped margin between spines, inserted slightly nearer to posterior end of base 
of second dorsal than to tip of snout, posteriorly joined to back by rather broad mem- 
brane behind last spine, the spines slender and the middle ones longest ; second dorsal 
rather short, with evenly rounded dorsal margin, without membrane behind last ray ; 
anal inserted beneath middle space between third and fourth rays of second dorsal, 

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