Fishes of the South Pacific. 9 
the angle of jaws than tip of snout; anterior nostrils tubular, short, 
equal to one-half the diameter of eye; posterior nostrils round 
holes over anterior half of eye; interorbital 1.20 in snout; a longi- 
tudinal groove on top of head; gill openings small, equal to eye; 
distance from angle of jaw to tip 2.10 in head; teeth in upper jaw 
biserial, the inner row the largest; a group of 9 enlarged canine- 
like teeth in anterior third of upper jaw of which three are on 
the vomer, the two posterior maxillary teeth are the largest and 
closely resemble fangs; a single series of blunt teeth on the palates; 
sides of lower jaw with a single series, except at tip where there 
are 6 enlarged canines, about 20 teeth on each side. 
Color in spirits, a lamp black, lighter on belly which has some 
brownish reticulations and black spots; some lighter yellowish 
blotches on fins, intermingled with bluish black; head without 
markings, the under jaw is a shade lighter in color. 
One specimen from Tahiti, No. 1367 (Fig. 1) B. M. Length 
8.50 in. 
Gymnothorax thyrsoideus (Richardson). 
One specimen, No. 1037 B. M., from Faté, New Hebrides. 
One specimcn, No. 759 B. M., from Tubuai, Austral Ids. 
Gymnothorax flavomarginatus (Ruppell). 
In life this eel is a pale yellowish, thickly marbled with light 
brown, as figured by Bleeker (Atl. Icth. Tab. CLX XVIII, fig. 3) 
with a black spot at gill openings. In spirits it becomes a darker 
brown, but not densely marbled with black. (Giinth. Cat. Fishes, 
Vol. VIII, p. 120.) ‘Teeth are uniserial except vomerine series, 
which are forked in front. 
One specimen, No. 762 B.M., from Tubuai, Austral Ids. 
Length 17 in. 
One specimen, No. 1584 B. M., from Raiatea, Society Ids. 
Gymnothorax undulatus (Lacépéde). 
Depth 1.80 in head; head 2.25; eye 1.50 in snout, its snout is 
midway between snout and angle of jaws; interorbital equal to 
middle width of snout; jaws equal, their inner length from tip to 
angle 2.15 in head; greatest width of head 3.19 in its length; gill 
openings without black spot. 
Body elongate, cylindrical; no scales; no lateral line; head 
swollen above; the lower jaw slightly curved; teeth in a single 
row in jaws; the six anterior teeth of upper jaws enlarged depress- 
ible canines, vomer with two or three depressible canines; palate 
with a single row of six small but sharp-pointed teeth; posterior 
half of upper jaw has about 13 short oblique teeth in each side; 
the lower jaw has 21 small sharp teeth in each side, and 4 big 
canines in front of these; tongue atrophied; anterior nostrils tubu- 
lar, situated on the upper lip; posterior nostrils are circular holes 
